TCS Receiver. Specification.

The TCS receiver is a part of the system which locates on the destination sides or front-end sides of the DAQ. The receiver gets an information via an optical interface, decodes it and distributes it to a local front-end module.

Output signals:

CLOCK 38.88/40.08 MHz, TTL signal, or unipolar 100K ECL
Trigger TTL level, active LOW on the trailing edge of the CLOCK
RESET TTL level, active LOW on the trailing edge of the CLOCK
Beg. of Spill TTL level, active LOW on the trailing edge of the CLOCK
End of Spill TTL level, active LOW on the trailing edge of the CLOCK
Data Enable TTL level, when LOW the data[0..15] are valid on the trailing edge of the CLOCK
Data[0..15] TTL level, data
Error[0..3] TTL level, when one of them is LOW on the trailing edge of the CLOCK the error occurs on the serial link

Power

+5V 0.3 A
-5.2V 0.3 A

Data Format:

Two 16 bit wide words follow one trigger signal and form a control word. The words assigned to one trigger come sequentially one after another. The maximum latency of the control data respectively to the trigger is 3usec.

Bit assignments of the control word:

CNT_WORD[0..18] event number
CNT_WORD[19..20] event type
CNT_WORD[21..24] detector mask
CNT_WORD[21] Calorimeter
CNT_WORD[22] LAT
CNT_WORD[23] SAT
CNT_WORD[24] RICH
CNT_WORD[25..27] not used
CNT_WORD[28] reserved for silicon and MSGC readout
CNT_WORD[29..31] reserved for internal perpose

[ported from Trigger and Control System]

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Topic revision: r1 - 2008-06-28 - unknown
 
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