@pir_at @SilegoTech May replace the $2 power management CPLD with a $0.50 GreenPak if I can get an open toolchain for them working
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Replying to @pir_at
@pir_at@SilegoTech@oe1cxw Yep. I have a devkit on my desk and two weeks of free evenings during an upcoming business trip.1 reply 0 retweets 0 likes -
Replying to @azonenberg
@pir_at@SilegoTech@oe1cxw Going to start out by making a mapping between bitfiles and in-memory post-PAR netlists.1 reply 0 retweets 0 likes -
Replying to @azonenberg
@pir_at@SilegoTech@oe1cxw Then make a stupid simple PAR. Routing matrix is two crossbars + 10 lines between them. Looks doable w/ min-cut1 reply 0 retweets 0 likes -
Replying to @azonenberg
@pir_at@SilegoTech@oe1cxw Then just need to work with Clifford to handle techmapping in Yosys to make it all work.1 reply 0 retweets 0 likes -
Replying to @azonenberg
@pir_at@SilegoTech@oe1cxw Last missing piece is the programming algorithm, which is not documented. But I imagine I can figure it out1 reply 0 retweets 0 likes -
Replying to @azonenberg
@pir_at@SilegoTech@oe1cxw Worst case I decap a greenpak (50 cents and I have a whole tape of them) and RE the scan chains etc1 reply 0 retweets 0 likes -
Replying to @azonenberg
@pir_at@SilegoTech@oe1cxw For a 2kbit OTP memory there can't be a ton of programming logic. Could probably RE it in a weekend :P1 reply 0 retweets 0 likes -
Replying to @azonenberg
@pir_at@SilegoTech@oe1cxw Random stupid guess, shift N bits through a SPI-esque protocol then apply external Vpp to flash one row of NVM3 replies 0 retweets 0 likes
@azonenberg I just added yosys "synth_greenpak4" command. Add/change cell decls as you think is right and send me a patch or pull request.
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