jhenderson
Site Admin
Joined: 07 Mar 2006
Posts: 2254
Location: So. Cal. USA
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 Posted: Wed Mar 30, 2011 1:01 pm Post subject: DIO questions |
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| Quote: | I’m looking for the following technical information to ensure we can apply this card in our application…
1) How much VCC_INT power is available to the FPGA? I need to know how much processing I can stuff in the FPGA
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1V @10A.
| Quote: | 2) FMC/XMC LVDS questions…
a. How many LVDS from FMC/XMC go to the FPGA in total
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FMC connector is High Pin Count (HPC) variety as delineated in VITA57. There are 80 pairs total for the FMC, arranged as LA_P/N[33:0], HA_P/N[23:0] and HB[21:0].
Also have connections to backplane connector P2 for 20 pairs.
Total is 100 pairs connected to the FPGA.
| Quote: | b. How many of those go to FPGA clock I/O
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As called out by VITA 57 spec LA_P/N[1:0], LA_P/N[18:17], HA_P/N[1:0], HA_P/N[17], HB_P/N[0], HB_P/N[6], HB_P/N[17]
| Quote: | c. How many go directly to the VPX connector?
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Connections to backplane connector P2 for 20 pairs.
| Quote: | 3) LVDS length matched
a. What is the tolerance for length matching within a LVDS pair?
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Matched to 5 mils in a pair
| Quote: | b. Are LVDS pairs length matched to each other, and if so what tolerance?
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Defined groups are matched as noted
FMC LA_P/N [33:0] matched to 10 mils within group (lengths = 3334 to 3344 mils)
FMC HA_P/N [23:0] matched to 10 mils within group (lengths = 2446 to 2456 mils)
FMC HB_P/N [33:0] matched to 10 mils within group (lengths = 2940 to 2950 mils)
Here are DIO to the backplane. They are not all tightly matched.
DIO LENGTH DIFF FROM MEAN
0 2449 -599.44
1 2374 -674.44
2 2674 -374.44
3 2480 -568.44
4 2720 -328.44
5 2899 -149.44
6 3145 96.56
7 2843 -205.44
8 3162 113.56
9 3179 130.56
10 3381 332.56
11 3079 30.56
12 3564 515.56
13 3277 228.56
14 4030 981.56
15 3519 470.56
MEAN
3048.44 |
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