Thanks Matt. I'll reconsider partaking in the next...
# shuttle
m
Thanks Matt. I'll reconsider partaking in the next 4 shuttles. The major flaw of this first shuttle is that you must use the Cravel harness which renders the 50 chips as useless, only suited for testing.of a small design. You can do a true test chip without a harness for less than 5000 euro at Europractice and Mosis (if you carefully pick the right process node). David Patterson and John Hennesey point out that a 100 test chips at 28 nm will cost around $14,000. That's less than half of the Efabless price.
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m
You may well not be the target audience for this project. For me, the 50 chips aren't useless, but this is my first ASIC.
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I thought at the start having a cpu as part of the padring was a waste of space too, but now I'm glad there's at least a part of the chip that I'll be able to 'fix' later!
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l
@Merik Voswinkel , having an open source pdk, open source eda is priceless.
a
Also the CPU is what, 20% of the project area at most? I suspect the range of projects that can't fit in the caravel harness but don't need a bigger die period is actually fairly narrow
l
the caravel project is really complex. time is short.
a
iiuc most of the complexity is around debugging support / being hard to brick userspace because you always have a manager(who speaks usb) to reset it
Which is perhaps a bit "training wheels", and is certainly causing problems wrt deadlines but I'm in the same boat as matt wrt "first ASIC"