The red dot probably mean this is a QC reject, huh?
-
The red dot probably mean this is a QC reject, huh?
The lights come on at least! The FPGA gets warm quickly. I don’t see any obvious bitstream flash or boot mode switches…
Is >25W idle normal for this beast?
-
The lights come on at least! The FPGA gets warm quickly. I don’t see any obvious bitstream flash or boot mode switches…
Is >25W idle normal for this beast?
@craigjb Maybe pull the reset low and see if power changes? It might be stuck trying to access DDR that isn't there, or possibly bitstream comes from off-board?
-
The lights come on at least! The FPGA gets warm quickly. I don’t see any obvious bitstream flash or boot mode switches…
Is >25W idle normal for this beast?
@craigjb Oh yeah, you probably need a heatsink/fan too, 25W is a lot of Pd.
-
@craigjb Maybe pull the reset low and see if power changes? It might be stuck trying to access DDR that isn't there, or possibly bitstream comes from off-board?
@0h00000000 @craigjb may be jtag boot exclusively? with all the FMCs it looks like a dev board.
And the static power of an FPGA that big will be huge even if no bitstream is loaded. You can see the mounting holes from where the heatsink used to be, presumably taken off to ID the part before listing on ebay
-
@0h00000000 @craigjb may be jtag boot exclusively? with all the FMCs it looks like a dev board.
And the static power of an FPGA that big will be huge even if no bitstream is loaded. You can see the mounting holes from where the heatsink used to be, presumably taken off to ID the part before listing on ebay
@azonenberg Does Virtex protect itself if temp gets too high - i.e. w/o a heatsink on it?
-
@azonenberg Does Virtex protect itself if temp gets too high - i.e. w/o a heatsink on it?
@0h00000000 I believe most 7 series parts will shut down the active bitstream if they overheat, but if static power alone is enough to overheat they have no way to actually remove power.
You should probably put *some* kind of thermal solution on it even if temporary.
-
The lights come on at least! The FPGA gets warm quickly. I don’t see any obvious bitstream flash or boot mode switches…
Is >25W idle normal for this beast?
@craigjb That seems reasonable for the board. Those LTMs have significant input current at no load. Throw in a few clock generators and you are there.
The VU13P itself shouldn't be 25 W, 9.6 A VCCINT at 85 C plus a bit more for other rails.
-
@0h00000000 I believe most 7 series parts will shut down the active bitstream if they overheat, but if static power alone is enough to overheat they have no way to actually remove power.
You should probably put *some* kind of thermal solution on it even if temporary.
@azonenberg @0h00000000 On US+, automatic shutdown is off by default and would be at 125 C if enabled.
-
The lights come on at least! The FPGA gets warm quickly. I don’t see any obvious bitstream flash or boot mode switches…
Is >25W idle normal for this beast?
@craigjb I see a 14 pin .1" header at bottome right with LEDs labled FPGA_DONE and FPGA_INIT_B - that's gotta be the JTAG port.
-
@craigjb I see a 14 pin .1" header at bottome right with LEDs labled FPGA_DONE and FPGA_INIT_B - that's gotta be the JTAG port.
@0h00000000 yup. I agree. The init and done LEDs are super dim, so looks like no bitstream loaded
-
@azonenberg @0h00000000 On US+, automatic shutdown is off by default and would be at 125 C if enabled.
@dlharmon @0h00000000 and that's only like gating clocks or a JPROGRAM or equivalent right? like it won't actually gate VCCINT or anything (I doubt there's any way for it to do so)
-
R relay@relay.infosec.exchange shared this topic
