Strategy for unified data link
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Transcript of Strategy for unified data link
Strategy for unified data link
Zhen-An LIU
Institute of High Energy Physics
New Ideas on Belle II DAQ• Consideration
Base– HS data
transmission– Optical link– Unified Readout– Unified Data link– Also trigger?– Also timing?
• My talk on PMC/COPPER link
Trigger path suggestion to Iwasaki-san
• If HS data link used– RocketIO (SEDES)– Synchronization needed (per channel)– Channel Alignment needed (per system)– Pipelined processing
• Trigger latency should reserve big enough– 5 us maybe enough but conservative– 7 us in BESIII
• Trigger distribution– More time needed
Scheme1 for Data link (to Copper)• Based on discussions two schemes in consideration • Scheme 1
– Detector specific readout( Gary’s board or other?)• 16 ch/optical line• Data preprocessing• Partial packaging• Data frame/protocol• Length/ch/event?• Trigger L1 driven
– Data merger• Further packaging • Necessary to save COPPER boards• Output to COPPER PMC• Data frame2
– PMC • Data mover to CPU on COPPER
VMEBUS
Clock(40MHz)
Test output
Reserved
95Con
95Con
5V/3.3VBus
SwitchIDT
QS316211
OpticalFiber 9
HFBR5921L 0
HFBR5921L 9
HFBR5921L 1OpticalFiber 1
OpticalFiber 8 HFBR5921L 8
34 PinLVDS
34 PinLVDS
SN75LVDS387LVTTL-LVDS
SN75LVDS387LVTTL-LVDS
16*12 Test Pins
16 Test Pin
16 Test Pin
16 Test Pin
16 Test Pin
Power SupplyLT1764EQ-DD1.5V,2.5V,3.3V,5V1.6~2.5V Adjustable
LED Display
D(0:31)SN74
ALVTH162245
D(0:31)
SN74ALVTH162244MC100EP16FD
CDCF580180MHz
XC2VP40FF1152-6
Download circuit
1.6 GBps
/ch
Merger test module
From UnifiedReadout
To COPPERPMC Control
SignalsVia USERpins
Optical Fiber0
To be decided with Scheme 1
• Clock for HS transmission• System clock• How many input ch / board?
– Data rate– Data size
• VirtexII Pro / VirtexV ?• Synch/Asych?
– Synchronized data transmission.
• Data frame
Status• Hardware available
– Data source – Merger board– Test system available
• Protocol– Need FRST, Tsync sign
als from timing sys.– Need more discussion w
ith timing/readout/COPPER people
• PMC to be designed
Scheme2 for Data link
• In scheme 1:– Optical transceiver inside detector( say CDC)– Question:
• Reliability not so good in BESIII– Radiation? Experiment did before design– ESD effect? Experiments under taken– Unclear yet!
• Stop machine for replacement?• Open the Detector for replacement?
– Possible solution• Optical transceiver outside detector• Merger before HS data link
Scheme2 for Data link
• Scheme 2– Merger near detector – Electrical to FEE– Optical to
PMC/COPPER– Easy maintenance– SFP transceiver
More discussion scheduled
• A discussion is scheduled tomorrow
• Idea from detector and FEE welcome