Ⅱ-9. Instrumentation

RIKEN Accel. Prog. Rep. 52 (2019)

MPV – Parallel Readout Extension of VME
H. Baba,∗1 T. Ichihara,∗1 T. Isobe,∗1 T. Ohnishi,∗1 K. Yoshida,∗1 Y. Watanabe,∗1 S. Ota,∗2 S. Shimoura,∗2 andS. Takeuchi∗2
We have been developing a data acquisition (DAQ)
system at RIBF. The parallel readout VME DAQ system1) was successfully operated in 2016. In this system,
the data readout of all VME modules were completely
parallelized by a mountable controller (MOCO).2) TheDAQ performance was signiﬁcantly improved; however,the usability and robustness of the system was rather
problematic. To solve these problems, we developed
a new MPV system (MOCO with parallelized VME),
which is a type of parallel readout extension of the VME.
When we set up the MOCO system, several unwantedfeatures were found: 1) MOCO was installed between
the VME module and VME backplane; consequently,
the VME module protruded from the VME shelf by
7 cm. Some circuit components on the VME module
were exposed, which caused a short-circuit. 2) MOCO
had USB connectivity. A single PC can handle multiple
MOCOs. However, owing to the congestion in the USB,the data transfer speed fatally degrades. To obtain agood performance, same number of PCs and MOCOs
should be installed. 3) To synchronize events between
MOCOs and other DAQ devices, trigger and busy signals have to be exchanged. For this purpose, four additional pairs of diﬀerential cables were connected to theMOCO located inside the VME shelf, which creates amess of cables.
In this study, we developed circuit boards known
as the MPV controller (Fig. 1) and MPV backplane(Fig. 2). All DAQ communications (e.g. trigger anddata) for MOCO are done through this controller. Avnet
PicoZed 70103) (red board in Fig. 1), which contains
Xilinx Zynq-7000 All Programmable System-on-Chip, isadopted as the main circuit of the controller. Logic cirLVDS I/O (4 x 6 Lines)
MOCO 1
MOCO 2
MOCO 3
MOCO 4
MOCO 5
MOCO 6NIM I/O
Trigger,Busy, etc

Avnet PicoZed 7010 isadopted to implement

1Gbps
Ethernet

Data and commands
are communicatedlines routed on theMPV backplaneFig. 1. Image of MPV controller. This controller can simultaneously handle up to 6 modules of MOCO.
∗1∗2

RIKEN Nishina Center
Center for Nuclear Study, University of Tokyo

Front side

Rear side
MOCO isinstalledfrom therear side

MPVControllerlines are routed
to each slot
J2 C01-C08 pins are
assigned forPower connectors(+5 V, +12 V, -12 V)

Fig. 2. Image of the MPV backplane (5-slot). 7-slot typeis also available. Dimension and mounting holes arecompatible with Schroﬀ/NVENT Monolithic Backplane(23001-065 for 5 slot, 23001-067 for 7 slot).

cuits to handle the MOCO are implemented on PicoZed.
The MPV controller accesses the MOCO through thediﬀerential lines on the backplane. Four pairs of differential lines (LVDS) are routed to each slot from thecontroller position, i.e., there are 24 pairs of diﬀerentiallines on the MPV backplane. In the previous MOCObased system, additional cables and PCs were required.
However, this MPV system does not require any extra
cables and devices. As shown in Fig. 2, the MPV controller is installed at the left-most slot of the backplane.
VME modules are installed at the front, similar to thestandard VME system. Simultaneously, MOCOs are inserted from the rear side of the backplane. A MOCO canaccess the VME module through the DIN41612 connectors. In the standard VME backplane, all slots shared
the VME bus lines. In contrast, the MPV backplane
has an isolated architecture except for power lines. Data
are independently acquired by FPGA on the controller,
which can be read-out from the 1 Gbps ethernet port.
The maximum possible data rate for the six MOCOs
is 960 Mbps, which is within the range of theoreticalthroughput of 1 Gbps ethernet with a jumbo frame.
These features enable the complete parallel read-out of
the VME-based DAQ system.
In conclusion, the hardware of the MPV has been successfully produced. The ﬁrmware for the MPV controller
is under development. This system will be ready in 2019.
References

1) H. Baba et al., RIKEN Accel. Prog. Rep. 50, 224 (2017).
2) H. Baba et al., RIKEN Accel. Prog. Rep. 45, 9 (2012).
3) http://zedboard.org/product/picozed- 146 -