# Presentation: 510658

##  V123S Event Link Encoder, Transmission System and PLL Receiver

- Thomas M. Kerner (BNL)
- SNS Global Controls

- SNS Software Final Design Review

- 01/11/2002

## Event Link System Features

- Low Latency Event Delivery using short code length, 17MHz carrier, passive fanouts and short code lengths.
- Asynchronous 12-bit encode and decode with hardware prioritization to allow fast event delivery.  High priority events will transmit first. Trigger priority runs from left to right on input modules.
- Hybrid optical and shielded twisted wire pair system
- 1 ns Jitter Clock Recovery using PLL receiver
- Low Bit Error Rate with high signal to noise ratio
- Single Cable Clock and Data eliminates clock skew and reduces cable cost
- 256 Event Codes with priority translation table so new priorities may be assigned to event codes without affecting receivers.

- SNS Software Final Design Review

- 01/11/2002

## Event Link System Features (cont.)

- Beam Synchronous Event Link carrier is a multiple of the RF clock
- Free PLL receiver drop-in artwork, parts list and program file available to DOE facilities for the PLL Link Receiver Interface.
- Lock out of low priority events including the message stack between pre-pulse PP and TEXT to avoid delaying the extraction event.
- A linked series of events with programmable delays may be generated by feeding back outputs to inputs.
- Message FIFO for software generated events.
- Tracks with LLRF for machine tune an energy changes

- SNS Software Final Design Review

- 01/11/2002

## Provides:

-  Facility-wide broadcast event timing, LLRF synchronous clock, and informational events for distributed systems:
- Neutron chopper
- LINAC chopper
- LINAC and Ring RF
- Injection and Extraction
- Beam Instrumentation
- Scopes
- Utility Modules

- SNS Software Final Design Review

- 01/11/2002

## Status & Control Registers

- CONTROL
- Interrupt enable
- On-line/Off-line
- Interrupt ROAK/RORA
- Automatic clock switching on LLRF status (between internal / external LLRF)
- Manual clock override
- Interrupt vector register
- Interrupt level register
- Event FIFO input register

- STATUS
- VME ID string
- RF clock bad (occ.)
- Beam clock fault (r.t.)
- FIFO full (r.t. & occ.)
- FIFO empty (r.t.)
- Clock in-use (r.t.)
- PP – Text lockout (r.t.)
- Input error registers (occ.)
- FIFO Value < 64 error
- V101 Input module > 63 error
- Input rate error, lost event

- For details see V123S Event Link Module manual at _[http://www.](http://www.sns.bnl.gov/epics/timing/doc/v123s/V123S%20revA1.htm)__[sns](http://www.sns.bnl.gov/epics/timing/doc/v123s/V123S%20revA1.htm)__[.](http://www.sns.bnl.gov/epics/timing/doc/v123s/V123S%20revA1.htm)__[bnl](http://www.sns.bnl.gov/epics/timing/doc/v123s/V123S%20revA1.htm)__[.](http://www.sns.bnl.gov/epics/timing/doc/v123s/V123S%20revA1.htm)__[gov](http://www.sns.bnl.gov/epics/timing/doc/v123s/V123S%20revA1.htm)__[/epics/timing/doc/v123s/V123S revA1.](http://www.sns.bnl.gov/epics/timing/doc/v123s/V123S%20revA1.htm)__[htm](http://www.sns.bnl.gov/epics/timing/doc/v123s/V123S%20revA1.htm)_

- SNS Software Final Design Review

- 01/11/2002

## Event Link System - Block Diagram

- SNS Software Final Design Review

- 01/11/2002

## Event Link System - Block Diagram

- SNS Software Final Design Review

- 01/11/2002

## Event Link Encoder & Input Module

- SNS Software Final Design Review

- 01/11/2002

## Event Link Encoder – P2 Dedicated Bus

**External**
**Inputs**

**Private**
**P2 bus**

**VME BUS**

**P2**

**P2**

**P2**

**P2**

**P2**

**32x F****REV**
**Clock**

**Beam**
**Sync**
**Encoder**

**Event**
**Input**
**Module**

**Event**
**Input**
**Module**

**Event**
**Input**
**Module**

**Event**
**Input**
**Module**

**Encoded**
**Beam**
**Sync**
**output**

- SNS Software Final Design Review

- 01/11/2002

## Event Link Encoder - Bi Phase Mark Encoding

- SNS Software Final Design Review

- 01/11/2002

## PLL Receiver – IP Module

- Insert IP module Prototype Picture Here

- SNS Software Final Design Review

- 01/11/2002

## Fanout & Fiberoptic Chassis

- 16 outputs on
-  production units

- Fiber optic
- receiver module

- Fiber optic
- transmitter module

- Power supplies

- SNS Software Final Design Review

- 01/11/2002

## Machine Cycle & Accumulation Detail

- SNS Software Final Design Review

- 01/11/2002