Embed Size (px)
DESCRIPTION
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. - PowerPoint PPT Presentation
Citation preview
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
