DFE Meeting
Present: Mrinmoy Bhattacharjee, Fred Borcherding, Jerry Blazey, Stefan Gruenendahl, Jamieson Olson, Levan Babukhadia, Manuel Martin, Kyle Stevenson, Liang Hang, Satish Desai, Paul Grannis.
Jamieson visited Circuit Service last Thursday and found that the CTOC board looked fine. The board had not yet been sent out for x-ray. [Note added in proof: Circuit City reported after the meeting that the CTOC board has been x-rayed, looks good, and is ready for pickup. Jamieson or Johnny Green will pick it up Wednesday, June 27th.] There is no word from Nextek regarding the socketed CTOC.
Jamieson will examine the card before he departs for vacation. If the CTOC is found to pass initial tests we will go into production with Circuit Service. In order to collect a full complement of eight CTOC boards, six will be ordered to join the already functioning card at DAB and the card currently at Circuit Service. The four broken CTOC boards will be reworked to provide spares. Johnny Green has the information to perform JTAG tests to ascertain their quality.
Should an alternate vendor be required, Johnny has sufficient documentation to begin the ordering process in Jamieson’s absence. There are already candidate vendors under consideration.
The crate controller firmware is done and Jamieson is working on software for the microprocessor. The DFE occupancy level firmware is under test today with the data-pump. Twenty-one DFE cards are now at PREP being tested with older software. Of two cards labeled as broken by PREP, one tested OK and the other had bit errors on a single link. The PREP staff are not expert enough perform the entire test.
Mixer board status
Last
Friday Jerry and Fred met with Stefano Rapisarda and Neal Wilcer, the team
responsible for the mixer cards. Also in attendance was Vince Pavlicek. The clock system has been fully tested and
data flow tests, though just starting, are going well.
Stefano believes
the cards will be ready for production by mid-July after two weeks additional testing
and a week to modify the complicated layouts. The first production cards will
arrive two weeks later and the full complement in three weeks (early August). Since the cards will be hand-stuffed at the
CD and each card requires three days to assemble, two CD techs and one D0 tech
will be assigned to the task. With
three techs the cards can be produced in four weeks. Stefano will test the cards himself, each requiring a day or so,
which is well matched to the production schedule. In this scenario the first set of cards could be available by
mid-August and all cards by the end of August.
(To accelerate the schedule,
there was some discussion that the cards could be released for production next
week with stuffing to begin two weeks later, if the data testing was successful. This might save a week or two.)
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| Jerry and Fred will visit the CD again early next
week to reconsider the schedule. |
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Twelve
of twenty mixer to DFE cable harnesses have been made. The twelve boxes
containing the 2-meter 150 cables for the remaining harnesses cannot be
located. Pat Sheehan has obtained a
quote of $44k to replace the cables and is preparing a sole source order to
ensure identical cables. Delivery will
require 6-8 weeks. Trigger M&S
funds will be used to purchase the cables.
Commissioning
Jamieson has
prepared monitoring software that sets a bit if the DFE occupancy trigger has
been satisfied. This provides a way to
interrogate the DFE trigger information via 1553. The current plan is to test the DFE/CTOC combination at DAB3. Next an AFE will be added to the chain. Fred
Borcherding will work with Jamieson and John Anderson about the repeated frame
sent by the AFE. Once the full chain operates a chain will be set up on the
platform.
Stefan has been
working on the AFE cryo-control software.
This is required for the AFE test stands and is high priority. As soon as that is complete he will begin
working on DFE software. He will also
continue with the general commissioning in Jamieson’s absence.
Tomorrow, during access,
the DFECs will be removed, modified (an incorrect 1553 component will be
replaced), and reinstalled.
Levan will be gone
the next few weeks and Ricardo and Satish will be the main contact for any
firmware issues.
Code for a simple examine has been inserted into CVS. This week Mrinmoy will add plots for the occupancy triggers. Kyle has been developing plots for the DFEs and CTOCs. The unmangling code will likely be generalized and released for general D0 use.
Manuel presented a proposal for replacing the 5DFES – 4CPSS system with just four DFESs. In this proposal the 20 AFES will feed a north u strip DFE, a north v strip DFE, a south u strip DFE and a south v strip DFE. Experience gained with the similar FPS firmware indicates that the smaller system has adequate resources for the CPS L2 firmware. According to Fred Borcherding the associated cabling changes are not difficult (albeit delicate) and will require a single eight-hour access. The extant CPSS code can be easily transferred to the DFEs. There is a small bonus that the FPSS and DFES cards will have the same chip configurations. There will also be sufficient spare cards to install CPSS type cards if needed.
The old configuration had 10 XCV1000 FPGAs (on the 5 DFESs) and 4 XCV600 FPGAs (on the 4 CPSSs) while the new systems has only 8 XCV1000 FPGAs (on the 4 DFESs). This will reduce the FPGA order cited in the last set of Firmware Meeting minutes ( http://www-d0.fnal.gov/~blevan/upgrade/CTPT/Trig_DFE_Firm_mtgs/archive/minutes_062201.txt ) from 12 XCV1000 FPGAs to 10 XCV1000 FPGAs and 16 XCV600s to 12 XCV600s.
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| If there are no objections by noon tomorrow the
new configuration will be adopted|
| and the 10 XCV1000 and 12
XCV600 FPGA order placed. |
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