MQDC-32(Data sheet V1.4_08)

fast 32 channel VME
charge integrating ADC

mesytec MQDC-32 is a fast 32 channels charge integrating ADC with individual gates. It
provides a 12 Bit (4 k) resolution with low differential non linearity due to sliding scale
method. The total dead time is 250 ns for an event with all 32 channels responding. It
supports zero suppression with individual thresholds. Special features: Built in pulse
shape discrimination with 32 gate generators. Delayed gating with experiment trigger
possible.
Features:
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High quality 12 bit (4 k) conversion with sliding scale ADC(DNL <2 %)250 ns conversion and clear time for 32 channels
Delayed gating with experiment trigger
64 k (32- bit-) words multi event buffer(1 word corresponds to 1 converted channel→ 2 k to 21 k events total)
Multiplicity filter, selects events on specified mult.-range
Configurable: Individual gates or common gate
Zero suppression with individual thresholds
Supports different types of time stamping
Independent bank operation
Polarity is jumper selectable(for processing dynode or anode signals)
Sensitivity and input resistance can be configured by
special gain jumpers (50 pC to some nC. Default 500 pC)
Signal input unipolar or differential (jumper configurable)
Differential inputs allow easy delay by twisted pair cables
AC coupled and baseline restored inputs.
Optional DC-coupled via register setting
Easy to use pulse shape analysis capability by 32 individualgate generators (4.5 ns to 300 ns)
Gate and differential control inputs ECL, LVDS and PECLCan be terminated via register setting
mesytec control bus to control external mesytec modules
Address modes: A24 / A32
Data transfer modes: D16 (registers),
D32, BLT32, MBLT64, CBLT, CMBLT64
Multicast for event reset and time stamping start
Live insertion (can be inserted in a running crate)
low power consumption (12 W)
mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
info@mesytec.com - www.mesytec.com

MQDC-32

Fast 32 channel VME
charge integrating ADC

MQDC-32, Internal design

Input (I0) requires an analogue signal, for example from a photo multiplier. The signal may be differential
or unipolar, the polarity may be positive or negative.
GJ is a small plug on module (gain jumper). It can be plugged on in two positions, coding for positive or
negative input polarity.
There are different gain jumpers for differential or unipolar input, different input sensitivities and also input
termination is coded on the jumpers.
DC is a fast linear amplifier and buffer unit.
IC is an AC-coupling, which filters out possible DC-offset of the input signal. To keep baseline stability athigh rates, it also performs a baseline restoration based on the master gate. It can be bypassed by registersetting.
Gate is a fast switch, which can open and close within 2 ns depending on the logic state of the gate line.
Gates as short as 4 ns are possible.
INT is an integrator, which integrates the input signal when gate is on. It allows to integrate positive andnegative signals. So undershoots of the input signals do not create problems. It is cleared after master gate
and conversion are finished.
shift signal: it adds a voltage to the integrator output, before it is digitized. So the integrator output can beshifted to allow also conversion of integrals of slightly negative pulses.
Multiplexed ADC four channels are digitized by one ADC channel (25 ns conv. time).
All 32 channels are converted in 100 ns by 8 ADCs.
Central Logic is an FPGA with 64 000 words of memory. It controls the conversion and serves the VME-bus.
Gate Logic, each channel includes a gate logic, which controls the gates. See next diagrammesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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MQDC-32

Fast 32 channel VME
charge integrating ADC

Gate inputs (G0) are differential inputs, and work with any input in the range of ±4 V.
For example ECL and LVDS.
Set termination is an electronic switch, which can be set for each bank by register.
It allows to terminate the inputs with 110 Ω for the differential lines (default).
Weak pull up are two resistors which keep the gate input in a defined state when not connected.
Default is "on" state to allow the use of master gate without individual gates connected.
Gate Limiter is a circuit which can close the gate after an adjusted time. The time can be set in the range of
4 ns to 300 ns (or infinite) for each bank. It allows for easy pulse shape discrimination(see section pulse shape discrimination).

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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Fast 32 channel VME
charge integrating ADC

MQDC-32

Analogue channel Inputs
MQDC Input connector

Tyco AMPLIMITE. 050 Series, mates with connector: Tyco part_no 5749621-7
Two adapters from module connector to two 34 pin header connectors are included at delivery. Shown is thepin out of the lower (bank 0) connector. The upper one starts with channel 16 up to channel 31 (bank 1).

When unipolar gain jumpers are used, the negative signal inputs are internally connected to ground.
With unipolar input, a mesytec adapter from 34 pin header connector to Lemo (Adapter MAD-34-16-S)
can be added.

Analogue signal input configuration

Analogue signal inputs are configure by gain jumpers, which allow a high flexibility.
The jumper position codes for positive or negative inputs. The lowest jumper in the following pictures
illustrate the polarity setting:inverted input

non inverted input(neg. signals at Sig+ input)(pos. signals at Sig+ input)

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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MQDC-32

Fast 32 channel VME
charge integrating ADC

Different types of gain jumpers are available, which code for••••unipolar or differential input
input termination (high ohmic, 50 Ω, 110 Ω or custom type)
input sensitivity (50 pC to some nC full range)
standard jumpers
termination: unipolar 50 Ω, differential 110 Ω, or high ohmic for pulse shape discrimination
sensitivity: 50 pC, 150 pC, 500 pC, 1.5 nC, 5 nC

At delivery two sets of gain jumpers are included

Differential, 110 Ω, 500 pC
Unipolar, 50 Ω, 500 pC

Individual Gates input
The individual gate inputs accept differential signals of almost every differential standard. So ECL, PECL
and LVDS is compatible. The inputs can be set as terminated 110 Ω or high ohmic by VME- registers.

Control input / output
Differential control inputs

interface any differential signals: ECL, LVDS or PECL.
They can be individually terminated via register setting
input/output direction termination Default functionallity Alternate functionalities
ECL0
Input
RT*
Gate0
ECL1
Input
RT*
Gate1
Time stamp oscillator input
Reset time stamp
ECL2
Input
RT*
Experiment Trigger Input
counter
ECL3
Output
100 R
Busy
NIM0
Input
50 R
Gate0
NIM1
Input
50 R
Gate1
Time stamp oscillator input
NIM2
Input
50 R
Reset time stamp counter
Experiment Trigger Input
Mesytec control bus
Input /
Buffer full
NIM3
50 R
Busy
OutputData conv ready
FIFO data threshold reached* “RT” means register selectable termination.

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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Fast 32 channel VME
charge integrating ADC

MQDC-32

NIM output

Signal processing and conversion–0.7 V when terminated with 50 Ω

The basic difficulty for QDC operation is baseline
offset and baseline drift. MQDC-32 overcomes thisby providing AC coupled inputs with baseline
restoration. The signals are restored while themaster gate is not active. The restoration works
with a long time constant to avoid any influence on
the fast signals.

mesytec control bus output, shares connector withbusy output. +0.7 V terminated.
Digital inputs / outputs (see IO register block
0x6060)
Front Panel LEDs

LED „Conv“
LED „Drdy“

digitization in progress
Data are ready converted and canbe read out
LED „Nrdy“ Gate detected, but ADC busy.
Event will be lostLED „Dtack“ Access from VME bus accepted
Lemo and differential inputs

minimum gate width for master- and for individual
gates = 4 ns
maximum external reference oscillator frequency:
75 MHzFor special applications DC coupling is possible byregister setting.
The internal amplifiers of MQDC-32 preserve a
signal rise time of 2 ns. The high band widthallows precise pulse shape analysis of very fast
signals. The internal charge integrator accepts
positive and negative signals, so also signals withnegative undershoot (for example due toreflections) can be processed. The integrator output
can be shifted by ±25 % of the full range before itis digitized. Sliding scale method is used toachieve a low differential non linearity. It needs
1/16 of the full 4 k binary value.

Measurement conditions: gate of 50 ns
Conversion

Typical Noise inchannels rms

Max noise
Channel rms

Conversion time
32 channels

highestchannel /overflow channel

4k

1.2

1.6

100 nstotal dead time: 250 ns

3839 / 3840

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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Fast 32 channel VME
charge integrating ADC

MQDC-32

After conversion, additional filters
are available••

Threshold for individual channels:
if the thresholds are set, signals below thethresholds are suppressed in the output data.
Lower and upper threshold for the total numberof responding channels (multiplicity) areavailable. It the number of responding channels
is not within this window, the events aresuppressed.

Conversion, busy time•••

Digital conversion time: 100 ns
Conversion starts 50 ns after gates close
Recovery time after conversion: 100 ns

Gate operation

The MQDC-32 allows to work with individual
gates and also with only one or two master gates(Two gates at independent bank operation).
This mode is established when the individual gate
inputs are left floating. By default they areinternally pulled to the on state.

Gate and analogue signal timing

The individual gates should precede the signal by minimum 6 ns.
Master gates should preceded the individual gates by at least 2 ns.
Minimum gate length for master gates and individual gates is 4 ns.

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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7/30

Fast 32 channel VME
charge integrating ADC

MQDC-32

Delayed gating with experiment trigger
As MQDC-32 is a very fast converter, it can beusually operated free running with the common"OR" output of a CFD (works for example at
400 kHz free rate per gate with 10 % dead time).
When using MCFD-16 ored trigger as master gate,
only short twisted pair delay cables are needed tofulfil timing requirements.
But usually the ored free running triggers of a CFD
can not be used to trigger all digitization modulesof a setup. This would produce excessive data anddead time. A central trigger logic is needed todecide from all detector triggers if the event data
should be converted or not. This trigger is called
here "experiment trigger". Such a trigger decision
can only be taken when the slowest detector of the
setup, which is relevant for the trigger decision,
has produced its trigger. This delay may be forexample a microsecond.
Now the typical problem with QDCs emerges.
The decision if a QDC-gate has to be createddepends on experiment trigger, so all signals to the
QDC have to be delayed by a microsecond.
This will result in a cable length of 200 m or
expensive delay modules, which degrade theanalogue signals.
In delayed gating mode, MQDC-32 overcomes thisby sending its converted data in a queue.
A delay can be defined by register, in this example
delay 1100 ns. If the experiment trigger signal ishigh at that delay time relative to the event stamp(created at conversion gate end), the event may
pass to the main buffer, else it is skipped.
This is a big advantage over the traditional fast
clear. It does not create additional dead time, as
many events can be stored in the queue (FIFO),
and events can be picked selectively in a very shortcoincidence time (experiment trigger width,
minimum 25 ns wide).
The coincidence time widow can be determined bygenerating the correct experiment trigger width atthe QDC input.

The delays can be set at the following
registers

reg 0x6054 daq_gate_del0 in ns, off when = 0
reg 0x6056 daq_gate_del1 in ns, off when = 0(at split banks only)
The reset inputs can be selected as
experiment trigger inputs by setting theregisters

Experiment trigger available as ECL signal
reg 0x6066 ecl_fc_res = 2 ECL reset input used
Experiment trigger available as NIM signal
reg 0x606C nim_fc-reset = 2 NIM reset input used
As there is only one experiment trigger, there are
no different gate inputs for the banks at split bankoperation.

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
info@mesytec.com - www.mesytec.com

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Fast 32 channel VME
charge integrating ADC

MQDC-32

Pulse shape discrimination
MQDC-32 provides several features to allow easy
use as a very fast pulse shape discriminator.
Pulse shape discrimination is for example needed
for particle discrimination in liquid scintillators. In
this case an integral over the peak of the pulse iscompared to the integral of all the pulse.
For particles, which create a low charge density inthe scintillator, a component with short decay timeis dominantly emitted, for particles with highionisation density only a slower component isemitted.
The total setup consists of a fast constant fraction
discriminator with adjustable trigger output lengthand fast ored output of the individual triggers.
The signals are delayed adequately and fed to the
MQDC-32.

The analogue and gate signals are connected to the
2 banks of MQDC-32 in parallel. The gate
termination for one bank is switched off, the gain
jumpers of one bank are replaced with high ohmic
ones.
The MQDC-32 provides Gate limiters for eachchannel which allow via register setting to limit the
input gates to a value between 4 ns and 300 ns.
The gate limit is now used for bank 0(limit set to 8 ns → reg 0x6050 = 19).
The picture below shows how the internal gates are
modified.
The integral of channel 0 (bank 0) can now be
divided by the integral of channel 16 (bank 1) andthus gives a measure for the ionisation density, so aparticle discrimination value.

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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Fast 32 channel VME
charge integrating ADC

MQDC-32

Use MQDC-32 with MCFD-16
Pulse shape discrimination and all QDC operation
gets very easy when using the MCFD-16 and
MQDC-16 as a pair. The necessary delays are thenquite short, and can be established with a few
meters of twisted pair cables. Differential gain
jumpers are used, and set to non inverting position.
There is in many cases no need for further external
modules.
The cable length can be calculated thefollowing way•

L0 = Lemo cable length from fast OR of
MCFD-16 to Gate0 input of MQDC-32•

L1 = 34 pin Twisted pair cable from ECL pulse
output MCFD to Gate inputs MQDC•

L2 = 34 pin twisted pair cable from MCFD
analogue output to MQDC signal inputs

ExampleSignals from photo multiplier with 8 ns (20 % topeak) rise time are fed to the MCFD-16
The fraction is selected as 0.2 (20 %)The tap delay is set to tap 2, with 20 ns delay chips
this results in 20/5*2 = 8 ns
For L0 = 1 m of cable is needed

Cable length••

L1 = L0 + 2 m = 3m
L2 = L1 + 2 m + (tap_delay [ns] * (1 + fraction)/ 5 [m/ns]) = 7 m

Power consumption(Total: 12 W)+ 5 V +1.0 A+12 V +300 mA–12 V –250 mA

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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10/30

Fast 32 channel VME
charge integrating ADC

MQDC-32

MQDC32 register set
Data FIFO, read data at address 0x0000 (access R/W D32, 64)
Only even numbers of 32 bit-words will be transmitted. In case of odd number of data words, the last word
will be a fill word (= 0).
memory size: 64 k-72 = 65464 words with 32 bit length
Header (4 byte)2
headersignatureb01

6subheader

8
module id

1
no meaning

3
fill bits

b000000

module id

bx

b000

12
number of following datawords, including EOE
number of 32 bit data words

1
out of range
Oor

3

12

b000

ADC amplitude

Data (4 byte) DATA event2
data-sigb00

9

500 0100 000

Channel number

channel numbers may come in arbitrary order
Data (4 byte) Extended time stamp2
data-sig
b00

9

5

16

00 0100 100

0 000016 high bits of time stamp

Data (4 byte), fill dummy (to fill MBLT64 word at odd data number)2
data-sig
b00

9

5

1

3

12

0

0

0

0

0

End of Event mark (4 byte)
2
b11

30
trigger counter / time stamp

Threshold memory at address x4000 to x403F (16 bit words, access: R/W D16)
Address

Name

Bits

dir

Default

0x4000threshold[0]

12

RW

0

threshold[31]

12

RW

0

Comment
Threshold value of channel 0
value 0 = threshold not used...
0x403E

Threshold value channel 31

With the value 0x1FFF the channels are switched off.

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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Fast 32 channel VME
charge integrating ADC

MQDC-32

Registers, Starting at address x6000 (access D16)
Address

Bits

dir default

0x60000x6002Name
Address registers
address_source
address_reg

1
16

RW
RW

0
0

0x6004module_id

8

RW

0xFF

0x6006

fast_vme

1RW

00x6008soft_reset

1W

0x600E

firmware_revision

16R

0x60100x60120x60140x60160x6018

IRQ (ROACK)
irq_level
irq_vector
irq_test
irq_reset
irq_data_threshold

3
8
0
0
15

RW
RW
W
W
RW

0
0

0x601A

Max_transfer_data

15

RW

1

1

Comment
0 = from board coder, 1 from address_reg
address to override decoder on board
is part of data header
If value = FF, the 8 high bits of base address
are used (board coder).
accelerated VME interface, set to 0xfa
up to 20 % faster access*breaks all activities, sets critical parameters todefault. Wait 1 s until all settings are stable.
Format: 0xYY.ZZ, Y and Z: 0...F

IRQ priority 1..7, 0 = IRQ off
IRQ return value
initiates an IRQ (for test)
resets IRQ (for test)
Every time the number of 32 bit words in the
FIFO exceeds this threshold, an IRQ isemitted. Maximum allowed threshold is"FIFO size".
1) Specifies the amount of data read from
FIFO before Berr is emitted. Only active formulti event mode 3.
Transfer is stopped only after full events.
Example: At Max_transfer_data = 1, 1 event
per transfer is emitted.
2) Specifies the number of events readfrom FIFO before Berr is emitted.
Active for multi event mode 0xb.

0x601C*

IRQ_source

1

RW

1

0x601E*

irq_event_threshold

15

RW

1

* new in firmware FW0200

Setting the value to 0 allows unlimited
transfer.
IRQ source:
0 = event threshold exceeded
1 = data threshold exceeded
Every time the number of events in the FIFO
exceeds this threshold, an IRQ is emitted.

For multi event mode 2 and 3 the IRQ is:- set when the FIFO fill level gets more than the threshold and is- withdrawn when IRQ is acknowledged or when the fill level goes below the threshold.

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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Fast 32 channel VME
charge integrating ADC

MQDC-32

MCST CBLT
cblt_mcst_control
cblt_address
mcst_address

0x60200x60220x6024

8
8
8

RW
RW
R

0
0xAA
0xBB

see table
A31..A25 CBLT- address
A31..A25 MCST- address

0x6020: CBLT_MCST_Control 1
Bit

Name

Write

Read

7

MCSTENB

10

Enable MCSTNo effect

06

MCSTDIS10

Disable MCSTNo effect

1
0

5

FIRSTENB1
in a0

Enable first module
CBLT chain
No effect

04

FIRSTDIS1
in a0

Disable first module
CBLT chain
No effect

1
0

3

LASTENB1
in an
0

Enable last module
CBLT chain
No effect

02

LASTDIS1
in an
0

Disable last module
CBLT chain
No effect

10

1

CBLTENB

10

Enable CBLTNo effect

00

CBLTDIS10

Disable CBLTNo effect

10MCST enabled
MCST disabledFirst module in a CBLT chain
Not first module in a CBLT chain

Last module in a CBLT chain
Not last module in a CBLT chain

CBLT enabled
CBLT disabledmesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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MQDC-32

Fast 32 channel VME
charge integrating ADC

CBLT Address Field
A31..............A24

A23.................................................................A00

CBLT ADRS

8 high bits, not significant + 16 bit module address space

MCST Address Field
A31..............A24

A23.................................................................A00

MCST ADRS

8 high bits, not significant + 16 bit module address space

At BLT32

When an empty module is accessed at address 0, BERR is emitted.
At CBLT

When no module contains data, no data are transmitted. The last module emits BERR.
Usually when zero suppression is used and all modules were gated, each Module emits the header and footer
with time stamp (2 Words with 32 bits each: MQDC-32 Header, MQDC-32 footer).

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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Fast 32 channel VME
charge integrating ADC

MQDC-32

0x6030

FIFO handlingbuffer_data_length

16R

0x6032

data_len_format

2

RW

0x6034

readout_reset

0x6036

multi event

2

W

4

RW

Amount of data in FIFO (only fully converted
events). Units → data_len_format.
Can be used for single- and multi event transfer
0 = 8 bit, 1 = 16 bit, 2 = 32 bit, 3 = 64 bit
The number of 32bit words is always even. If
necessary the fill word „0“is added. For len = 0
and 1 the max value 0xFFFF is shown when
number exceeds the 16 bit format. The FIFO is
not affected.
If set to = 4 events in the FIFO are shown *At single event mode (multi event = 0): allow
new trigger, allow IRQ
At multi event = 1: checks threshold, sets IRQ
when enough data. Allows safe operation whenbuffer fill level does not go below the data
threshold at readout.
At multi event = 3: clears Berr, allows next
readout0
Bit[3]Bit [2]

Bit[1:0]

count events*
not words(reg. 0x601A)

skip berr,
send EOB

mode[1:0]

allow multi event buffering (bit 0,1)
mode = 0 → no (0x6034 clears event, allows
new conversion)mode = 1 → yes, unlimited transfer, no readout
reset required (0x6034 can be written after
block readout).
Don’t use for CBLT
mode =3 → yes but the module transfers
limited amount of data. With reg 0x601A thenumber of data words can be specified. After
word limit is reached, the next end of event
mark terminates transfer by emitting Berr. So
0x601A = 1 means event by event transfer (Berrafter each event). The next data block can betransferred after writing 0x6034 (resets Berr).
Berr handling: when bit[2] is set:
Send EOB = bit[31:30] = bx10 instead of Berr
*Bit[3]: Compare number of transmitted events(not words!) with max_transfer_data (0x601A)
for Berr condition.*mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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MQDC-32

0x6038marking_type

2

RW

0

0x603A

start_acq

1

RW

1

0x603C
0x603E

fifo_reset
data_ready1

WR

0x6040operation modebank_operation

3

RW

b000

0x60420x6044

adc_resolution
Offset_bank_0

1
8

RW
RW

fixed 0Per*

0x60460x60480x604A0x604C

Offset_bank_1
slc_off
skip_oorange
Ignore Thresholds

8
1
1
1

RW
RW
RW
RW

Per*
0
0
0

* new in firmware FW0200

Fast 32 channel VME
charge integrating ADC

00 → event counter (starts with 0 at first event)
01 → time stamp
11 → extended time stamp
1 → start accepting gates
If no external trigger logic, which stops the gateswhen daq is not running, is implemented, thisregister should be set to 0 before applying thefifo_reset to get a well defined status.
When setting it to 1 again for data acquisition
start, the buffer is in a well defined status.
initialise FIFO
1 → data available

bit 0:
0 → banks connected
1 → operate banks independent
bit 2, 1:bank 1, 0 switch weak pull on resistor off(usually leave bits at 0, 0)
0 → always 4 k
Channels 0 to 15: Range 0 to 255, Shifts 4 k
spectrum by ±1000 bins
same for channels 16 to 31
Switch off sliding scale
Skip out of range values
Set at 1 threshold settings at 0x4000...
are ignored (assumed as 0)* Modification of these registers may take some milliseconds to get effect in the hardware.

0x60500x6052gate limit
limit_bank_0
limit_bank_1

8
8

RW
RW

per*
per*

0x6054experiment
trigger
exp_trig_delay0(1)

14

RW

0

0x6056

exp_trig_delay1(1)

14

RW

0

4 = 4.5 ns, 255 = no limitation
same as for bank 0

delay of experiment gate relative to end of
QDC-gate (ns). Up to 16384 ns (16 k)
For bank0 or both at joined bank
For bank 1 if not joined(1) only available infirmware revision FW0110
and higher, all devices
upgradable

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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16/30

Fast 32 channel VME
charge integrating ADC

MQDC-32

Limit Bank 0/1 lookup table
DAC time [ns]DACtime [ns]

4

4,5

30

16

5

4,6

35

19

6

4,6

40

24

7

4,7

50

32

8

4,8

60

41

9

4,8

70

51

10

4,9

80

62

11

5,0

90

73

12

5,1

100

86

13

5,2

110

101

14

5,3

120

117

15

5,4

130

136

16

5,6

140

158

17

5,7

150

185

18

6,1

160

219

19

7,6

170

268

20

8,7

175

300

21

9,4

22

10,1

23

10,9

24

11,6

25

12,3

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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17/30

MQDC-32

IO
0x60600x6060

Inputs, outputs
input coupling

3

0x6062

ECL_term

50x6064

ECL_gate1_osc(ECL2)
ECL_FC_Reset(ECL1)

10x6068Gate_select10x606A

NIM_gat1_osc(NIM2)
NIM_FC_Reset(NIM1)

2

NIM_busy (NIM0)40x60660x606C

0x606E

2

2

Fast 32 channel VME
charge integrating ADC

bit[0] bank0: 0 → AC, 1 → DC
bit[1] bank1: 0 → AC, 1 → DC
bit[2] 0 = BLR on, 1 = BLR off (FW0114)
RW b11000 switch ECL/LVDS terminators on (1= on)
bit 0 for: "gate0",
bit 1 for "gate1",
bit 2 for "Res",bit 3 for bank 0 individual gate input
termination,
bit 4 for bank 1 individual gate input
termination.
Unconnected inputs will be in a well definedstate by internal weak pull up resistors.
RW
0
0 → gate1 input,
1 → oscillator input (also set 0x6096!!)RW
1
0 = Fast clear input (= "not Gate")
1 = Reset time stamp counter
2 = input for experiment trigger (1)RW
0
0 → Gate 0 and 1 from NIM-inputs,
1 → Gate 0 and 1 from ECL-inputs
RW
0
0 → gate1 input,
1 → oscillator input (also set 0x6096!!)RW
0
0 = Fast clear input (= "not Gate")
1 = Reset time stamp counter
2 = input for experiment trigger (1)
RW

b000

RW

0

0→ as busy (in independent bank operation:
active when both banks are busy)
3→ as Cbus output
4→ buffer full8→ data in buffer above threshold 0x6018
9→ events in buffer above threshold 0x601E(2)(1) only available in firmware revision FW0110 and higher, all devices upgradable
Experiment trigger gets active when ECL or NIM are configured as exp trigger input.
Starting with FW0200 ECL3 is also event gate input when 0x606C = 2 and 0x6068 = 0 (ECL3 notconfigured as gate0 input). Simplifies cabeling of ECL bus withh MQDC and MTDC in the chain.
(2) new in firmware FW0200
0x60700x6070

Test pulser
pulser_status;

4

RW

0

0x6072

pulser_dac

8

RW

32

b000 = off,b100 = amplitude = 0,b101 = use pulser-amplitude with 100 ns
gate
Pulser amplitude, typ. 32 for bin 2000

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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18/30

MQDC-32

Fast 32 channel VME
charge integrating ADC

Mesytec control bus
MRC
0x60800x60800x6082Module RC
rc_busno
rc_modnum

2
4

RW
RW

0x6084

rc_opcode7RW

0x60860x60880x608Arc_adrrc_datsend return status

8
16
4

RW
RW
R

0
0

0 is external bus, comes out at busy output
0...15 (module ID set with hex coder atexternal module)
3 = RC_on, 4 = RC_off, 6 = read_id,
16 = write_data, 18 = read_data
module internal address, see box below
data (send or receive),write starts sending
bit0 = active
bit1 = address collision
bit2 = no response from bus(no valid address)

Send time is 400 us. Wait that fixed time before reading response or sending new data.
Also polling at 0x608A for bit0 = 0 is possible
The Gate0-LED shows data traffic on the bus, the Gate1-LED shows bus errors (i.e. non terminated lines)
Example for controlling external modules with mesytec RC-bus

Initialise and read out a MCFD16 CFD- module.
MCFD16 ID-coder set to 7
Bus line must be terminated at the far end.
Activate MQDC32 control bus at busy line

Write(16) addr 0x606E data 3
Get Module ID-Code (=Type of module = 26 for MCFD16)

Write(16)Write(16)Write(16)addr 0x6082 data 7
addr 0x6084 data 6
addr 0x6088 data 0// address module 7// send code “read IDC”// initialise send request. Data has no effectWait loop: Read(16) 0x608A and compare bit0 to get 0. Then evaluate other bits for error status
Read(16)

addr 0x6088 data 40// at ID readout the bit 0 shows the module RC status// (1 is on). Bit 1..7 show the IDC// → interpretation: Module off, IDC = 20

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
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19/30

MQDC-32

Fast 32 channel VME
charge integrating ADC

Set threshold for channel 0 to 10

Write(16)Write(16)Write(16)Write(16)addr 0x6082 data 7
addr 0x6084 data 16
addr 0x6086 data 0
addr 0x6088 data 10// address module 7// code “write_data”// address module memory location 1// start send. Data to send

Wait loop: Read(16) 0x608A and compare bit0 to get 0. Then evaluate other bits for error status
Optional the read back data is available.
Read(16)
addr 0x6088 data 10 // read back written data for control
Read threshold of channel 0

Write(16)Write(16)Write(16)Write(16)addr 0x6082 data 7
addr 0x6084 data 18
addr 0x6086 data 0
addr 0x6088 data 0// address module 7// code “read_data”// address module memory location 1// send read request. Data has no effectWait loop: Read(16) 0x608A and compare bit0 to get 0. Then evaluate other bits for error status
Read(16)

addr 0x6088 data 10// read out data, “10” returned

Activate RC in module

All set data will get active. This can also be done before setting the values.
Write(16)Write(16)Write(16)addr 0x6082 data 7
addr 0x6084 data 3
addr 0x6088 data 0// address module 7// send code “RC_on”// initialise send request. Data has no effectDeactivate MQDC32 control bus at busy line

Write(16) addr 0x606E data 0// busy output used as busy

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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20/30

MQDC-32

Fast 32 channel VME
charge integrating ADC

CTRATime stamp counters, event counters
All counters have to be read in the order: low word then high word!!

They are latched at low word read. The event counter counts events which are written to the buffer.
CTRA
0x60900x6090counters A
Reset_ctr_ab2

RW

0x60920x60940x6096

evctr_lo
evctr_hits_sources

16
16
2

R
R
RW

0
0
b00

0x6098ts_divisor

16

RW

1

0x609C
0x609E

ts_counter_lo
ts_counter_hi

16
16

R
R

b0001 resets all counters in CTRA,
b0010 resets all counters in CTRB,
b1100 allows single shot reset for CTRA
with first edge of external reset signal.
the bit bx1xx is reset with this first edge
event counter low value
event counter high value
bit0: frequency source(VME=0, external=1)
bit1: external reset enable = 1
time stamp = time / (ts_divisor)
0 means division by 65536
Time low value
Time high value

CTRB

Counters are latched when VME is reading the low word
For counters "ADC_busy" and "Gate1_busy" the count basis is 25 ns.
Output value is divided by 40 to give a 1 us time basis
CTRB
0x60A00x60A0counters B
adc_busy_time_lo

16R

0x60A20x60A4adc_busy_time_hi
gate1_time_lo

16
16

R
R

0x60A60x60A80x60AA
0x60AC
0x60AEgate1_time_hi
time_0
time_1
time_2
stop_ctr

16
16
16
16
2

R
R
R
R
RW

ADC busy time, from gate to end of
conversion. Step [1 us]
Gated time from Lemo gate 1 input [1 us]
timer counts when gate1 has active NIM
level (–0.6 V). Step [1 us]
Time [1 us] (48 bit)00 = run, 1 = stop counter
bit 0 all counter B
bit 1 time stamp counter (A)mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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21/30

MQDC-32

Fast 32 channel VME
charge integrating ADC

Multiplicity filter
MULT
0x60B00x60B0high_limit0

6

RW

32

0x60B2

low_limit0

6

RW

0

0x60B40x60B6high-limit1
low-limit1

5
5

RW
RW

16
0

Bank0 (or B0, B1 when connected)
upper limit of responding channels
Bank0 (or B0, B1 when connected)
lower limit of responding channels
Bank 1 upper limit
Bank 1 lower limit

Events are accepted when: low_limit <= valid channels <= high_limit;

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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22/30

Fast 32 channel VME
charge integrating ADC

MQDC-32

Data handling
The event buffer is organised as a FIFO with a depth of 128 k x 32 bit.
Data is organized in an event structure, maximum size of one event is 36x 32-bit words(Header, End of event, 32 data, extended time stamp, fill word).
Event structure
Word # (32 bit) Content
0

Event header (indicates # of n following 32-bit words)

1

Data word #1

2

Data word #2

…

…

n-1

Data word #n-1

nEnd of event marker

Event Header (4 byte, 32 bit)
Short #1

Short #0

Byte #3

Byte #2

Byte #1

Byte #0

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

hsig

subheader

module id0 1 0 0 0 0 0 0 ii

ii

ii

ii

ii

ii

x
ii

ii

fill

9

8

7

6

5

4

3

2

1

0

# of following words

x 0 0 0 n n n n n n n n n n n n

hsig:

header signature = b01

subheader id:

currently = b000000→ Byte #3 = 0x40

module id:

depending on board coder settings→ Byte #2 = Module ID

fill:

fill bits, b000

x:

may be 1 or 0, no meaning# of follow. words:

indicates amount n of following 32-bit words:
n-1 events +1 end of event marker)

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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23/30

Fast 32 channel VME
charge integrating ADC

MQDC-32

Data words (4 byte, 32 bit) DATA-event
Short #1

Short #0

Byte #3

Byte #2

Byte #1

Byte #0

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

dsig

fix

channel #0 0 0 0 0 1 0 0 0 0 0

c

c

c

c

V
c

9

8

7

6

5

4

3

2

1

0

ADC data (12 valid bits)v 0 0 0 d d d d d d d d d d d ddsig:

data signature = b00

fix:

bit field currently without meaning = b000100000

channel #:number of ADC channel→ Byte #2 = channel#
within an event buffer, ADC channels may occur in arbitrary orderV:V = 1 indicates ADC over- or underflow

ADC data:

ADC conversion data, data width 12 valid bits

→ Byte #3 = 0x04

End of Event mark (4 byte, 32 bit)
Short #1

Short #0

Byte #3

Byte #2

Byte #1

Byte #0

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

esig
1 1

9

8

7

6

5

4

3

2

1

0

t

t

t

t

t

t

t

t

t

trigger counter / time stamp (30 bit)
t

t

t

t

t

t

t

t

t

t

t

t

t

t

t

t

t

t

t

t

t

esig:

end of event signature = b11

trigger counter/time stamp

30 bit trigger counter or time stamp information, depending on register
0x6038 “marking type”: 0 = event counter, 1 = time stamp

When in single event mode (register 0x6036 = 0), reading beyond EOE, MQDC-32 emits a VME
Berr (bus error).
When in multi event mode 3 (register 0x6036 = 3), reading beyond EOE after the limit specified inregister 0x601A, MQDC-32 emits a VME Berr (bus error)
This can be used to terminate a block transfer or multi block transfer.

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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24/30

MQDC-32

Fast 32 channel VME
charge integrating ADC

The MQDC32 read out in two modes
Single event readout

In this mode the pulses are stretched and converted starting with an external gate or trigger. The
data are then stored in a memory and the module waits for the VME readout. After readout of thedata at 0x0000 the register 0x6034 is written and allows a new gate to start the conversion. Gates
coming within the time from fist gate to writing the 0x6034 register are ignored. For dead time theconversion time and VME readout time add up.
1. Assumed: 32 bit read (D32 or BLT32)
Wait for IRQ to start readout of an event
Read register #6030 for event length
Read from buffer event_length + 1
Write reset register 0x6034
2. After IRQ start block transfer until BERR on VME-bus
Then write reset register 0x6034
ExampleStop acquisition: start_acq 0x603A = 0; Stop
Set multi event register 0x6036 = 0 (default).
At power up reset or after soft reset, the IRQ register is set to 0 (no interrupt)
Initialise IRQ (for example to IRQ1, Vector = 0):
set IRQ:
set reg 0x6012 to 0 (IRQ Vector)
set reg 0x6010 to 1 (IRQ-1 will be set when event is converted)
Reset FIFO: write register 0x6034 (any value)
start_acq: 0x603A = 1; Start
Now module is ready for IRQ triggered readout loop:→ IRQ
Read register 0x6030 for event length (D16)
Read from buffer event_length + 1 (BLT32)
Write reset register 0x6034 (D16)
Or:
→ IRQ
Start block transfer (BLT32) until BERR on VME-bus
Then write reset register 0x6034 (D16)
The above procedure works completely unchanged with multi event mode 0x6036 = 3 and
0x601A = 0. In this mode the buffer is used but the data are read out event by event.
After each event a Berr is emitted, which is removed by writing the 0x6034 readout reset.
mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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25/30

MQDC-32

Fast 32 channel VME
charge integrating ADC

Multi event readout

In multi event readout mode (0x6036, multivalent = 1 or 3) the input is decoupled from output by a 64 k
words buffer. So the input is ready for a new gate after the conversion time of the ADC.
When several converter modules are used in one setup, there has to be a way to identify coincident
data from different modules which belong to the same event.

Event synchronisation
One method is event counting.
Each module has an event counter and counts the incoming gates. In complex setups, the gates are
best initiated by the individual detector timing signals and significant amount of logic and timing
modules have to be established and adjusted to coordinate the detector triggers. A single timing error in all
the experiment run time, which will allow an additional gate to come to some module or a suppression of agate, will corrupt the complete data set, as data get asynchronous.
The better one is time stamping.
A central oscillator clock (for MQDC32 this can be the VME built in clock of 16 MHz or an external clock
up to 75 MHz) is counted to create a time basis. At experiment start the time counters of all modules are reset
via a VME multicast write to a reset register, or by an external reset signal.
All incoming events are then labelled with a 29 bit long time tag (when extended time stamp is set, an extra
16 bits are added). At data analysis the data streams
from different modules are analyse and correlated events are grouped for further processing.
The synchronisation methods allow the different modules to be completely independent from eachother. It gets now possible to use large data buffers in the front end modules, and do the readout
when the VME data bus is not occupied. The MQDC32 allows to set a buffer fill threshold whichemits an interrupt when the data fill level in the buffer exceed the threshold.

Data transfer
In principle any amount of data can be read at any time from the buffer, but then events may be splitted totwo consecutive readout cycles, which normally is no problem.
When only full events should be read in one readout cycle, there are two possibilities.
1. multi event mode = 1: read “buffer_data_length” (0x6030) and transfer
the amount of data read there.
2. multi event mode = 1: The buffer must be read to the end which means to the Berr mark. Note that this inprinciple requires to read an infinite number of words, because at fastest conversion the dead time may be
as low as 200 ns, the amount of data without zero suppression may be 34 words per conversion. So thetheoretical amount of data written to the buffer can be up to 170 Mwords/s, the VME readout rate isrealistic about 5 Mwords /s in BLT32. So under worst conditions it is not possible to empty the buffer via
VME and get an empty FIFO signal “Berr”! So if high rates can appear, the data acquisition should atleast be tolerant to splitted events.
3. an easier way to overcome those problems is to use multi event mode = 3 and limit the data transfer via
register 0x601A to a reasonable amount (for example 1000 Words). A “Berr” is then emitted after the next
“EOE” marker exceeding the word limit. After readout, 0x6034 has to be written to allow transmission ofa new data block.

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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26/30

Fast 32 channel VME
charge integrating ADC

MQDC-32

IRQ
For many setups it is useful to control the readout via interrupt requests (IRQ) defined by VME.
For MQDC32 an IRQ is initiated when the buffer fill level gets above the “irq_threshold” (0x6018).
The IRQ is acknowledged by the VME controller, then the controller starts a readout sequence.
When not using the readout reset (0x6034) at the end of a readout cycle, the MQDC does not know
when the cycle ends. The IRQ is then set again when the data fill level exceeds the IRQ-threshold.
When not enough data are read from FIFO to drive the FIFO fill level below the threshold, no new IRQ will
be emitted.
So for a readout which is stable against any external influences (readout delays, high input rates),
we recommend to write the readout_reset after each readout sequence. For several MQDC modules
in VME bin this can also be done with a single multicast write.

Example 1, multi event readout
1) Stop acquisition

start_acq 0x603A = 0; Stop
2) Time stamping
The module will use here an external reference oscillator and will be reset (synchronised)
via VME command.
Set oscillator input
Set oscillator source, reset sourceshow time stamp in EOE markSynchronisation:

ECL_gate1_osc
ts_sources
marking type
Reset_ctr_ab

0x6064 = 1;0x6096 = 2; (ext osc, int reset only)
0x6038 = 1;0x6090 = 3; reset all counters3) Set Multi event
Multi event 0x6036 = 3
Irq_threshold 0x6018 = 200
Max_transfer_dat 0x601A = 222

multi event with limited data transfer
Irq is set when more than 200 (32 bit-)words are in buffertransmit maximum 222 words + rest of event before sending
Berr.
(In this case data fits into one VME 255 word blt32transfer)4) IRQ
Initialise IRQ (for example to IRQ1, Vector = 0):
set IRQ:
set reg 0x6012 to 0 (IRQ Vector)
set reg 0x6010 to 1 (IRQ-1 will be set when event is converted)
set reg 0x6018 to 100 (IRQ emitted when more than 100 words in FIFO)
5) Buffer initialisation, start
Fifo_reset
0x603C = 0;
Readout reset 0x6034 = 0;start_acq
0x603A = 1; Start

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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27/30

MQDC-32

Fast 32 channel VME
charge integrating ADC

6) Readout loop
→ IRQ
Start multi block transfer (BLT32) until BERR on VME-bus
Then write reset register 0x6034 (D16)

Example 2, chained block transfer
Describes multi event readout but with 3 MQDCs and chained block transfer
To operate several modules in one VME bin, each module has to be given a different address. The 4
coders on the main board code for the highest 16 bits of the 32 bit address. Best way is, to use only
the highest 8 bits for coding (2 rotary coder marked with high). It makes sense to use the slot number as highaddress. So:
ADC1 in slot 1 gets 0x0100
ADC2 in slot 2 gets 0x0200
ADC3 in slot 3 gets 0x0300
If you don’t change the module ID default, the modules will now also have the ID 1…3 which willbe transmitted in the data header.
Now initialise the individual modules:
ADC1: set 0x0100 6020 to 0xA2 (CBLT first module, Multicast enable)
ADC2: set 0x0200 6020 to 0x82 (CBLT mid module, Multicast enable) also any further module inthe middle of the readout chain is initialised this way.
ADC3: set 0x0300 6020 to 0x8A (CBLT last module, Multicast enable)
When you don’t change the default addresses for CBLT and MCST, the modules will have the
CBLT start address of 0xAA00 0000 and the MCST start address of 0xBB00 0000.
You can now do the initialisation 1) to 5) of Example 1 via multicast at the offset address 0xBB00.
The readout loop has to be modified slightly:→ IRQ
Start multi block transfer (BLT32, MBLT64) at address 0xAA00 0000 until BERR on
VME-bus
Then write reset register 0xBB00 6034 (D16) at the multicast address.
Note: use multi event mode 0 or 3 for CBLT (mode 1 will not work !)mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
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28/30

MQDC-32

Fast 32 channel VME
charge integrating ADC

Special VME Operation
MBLT64

MBLT64 is defined by the address modifier. The word alignment within the transmitted 64 bit words is kept
by adding fill words to preserve even word numbers.
CMBLT64

Is intrinsic when chained block transfer is used with MBLT64.
Using the two banks independently
The MQDC-32 can work as two independent 16 channel ADCs. In this mode it creates independent
event structures for the two banks while the 5 bit (0..31) channel numbers are kept in the datawords.

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
info@mesytec.com - www.mesytec.com

29/30

MQDC-32

Fast 32 channel VME
charge integrating ADC

MQDC-32 overview
Address coders,
input gain jumpers

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
info@mesytec.com - www.mesytec.com

30/30