L. Greiner 1IPHC-LBNL Phone Conference 05/2011
STAR
IPHC-LBNL Phone Conference
News and PXL sensor (Ultimate) testing at LBNL
L. Greiner 2IPHC-LBNL Phone Conference 05/2011
STARPXL Project News
• Preparation for CD-2/3 review at BNL in July• Primarily a cost and schedule review but with some technical content.• Releases construction funding.• A set of documentation for the PXL detector is available at
http://rnc.lbl.gov/hft/hardware/docs/sensor_review/summary_v2.doc
• New Virtex-6 based RDO system boards design.• Design in progress• 3 PCB architecture, new connectors, cables, 9U VME physical format.• Details at
http://rnc.lbl.gov/hft/hardware/docs/ultimate/V6_RDO_MB_design_plans_hw_meeting.pptx
• Expected to be completed and ready to test in July.
• Significant Progress in mechanical structures.• See pictures next slide
L. Greiner 3IPHC-LBNL Phone Conference 05/2011
STARPXL Mechanical Construction
http://rnc.lbl.gov/hft/hardware/docs/ultimate/HFT_Mechanics_20110428.pptx
L. Greiner 4IPHC-LBNL Phone Conference 05/2011
STARUltimate Sensor Testing
5 Sensors mounted to individual test boards.
• 2 loaded with digital outputs only.• 3 loaded with digital outputs + analog output buffering.
L. Greiner 5IPHC-LBNL Phone Conference 05/2011
STARUltimate Sensor Testing
Testing plan
1. Power-on tests 2. Functional testing3. Characterization
Status
• We have done power on testing and are beginning functional testing. More on this on the next slide.
• JTAG is working and we can configure all registers.
• More to come.
L. Greiner 6IPHC-LBNL Phone Conference 05/2011
STARPower-on observations
Ultimate un-configured current draw.VDDA ~ 360 mA (E-4), 370 mA (A-2)
After RSTB => GND.VDDA ~ 0 mA
Power on sequence dependent: (RSTB tied to VDDA)Sequence: pwr-on VDDA ~ 490 mA, pwr-on VDDD ~ 620 mA
This is a surprise since Phase-1 did not exhibit this behavior.
Previous agreement to tie RSTB to VDDD to eliminate the need for this trace on the crowded readout cable.
This current draw is not immediately compatible with the current plan for no startup sequence LU protected power supplies for the ladder.
L. Greiner 7IPHC-LBNL Phone Conference 05/2011
STARQuick architecture review
Ladder x 4
FPGA
LU p
rot.
pow
er
MTB x 1 PowerSupplies
ControlPCs Trigger
DAQRDO PCsSIU
ADC
USB
i/o
RDO board x 1
Sensor testingProbe testingSRAM
Black – cfg, ctl, clk. pathBlue – data pathRed – power / gnd pathGreen – testing path
fiber
Unified Development Platform
L. Greiner 8IPHC-LBNL Phone Conference 05/2011
STAR Power-on current draw2 possible solutions with many variants:• RSTB Bus on cable:
– Control from FPGA – startup sequence control– RC timer circuit on cable (or MTB) – no startup
sequence control required– RSTB a “known sensitive” line?
• RSTB pad bonded to (any) power bus:– Bonded to VCCA – startup sequence control required.
Activate or reset LU-PS
Note that either is inherently safe as the LU protection limits current available to the sensors.
L. Greiner 9IPHC-LBNL Phone Conference 05/2011
STAR Summary
• For LBNL the testing of the PXL sensor has just begun and we will be moving to functional testing next.
• Power-on high current draw can be solved in a variety of ways – we will select one and incorporate it into the design.
• We are very interested in knowing if there are any known operational issues, variations from the manual, or hints for operation that IPHC has already discovered. This will help a lot with our testing.