Jim Brain <email@example.com> writes: > * Finding 5V CPLDs is getting harder (Xilinx has EOLed their XC9500 > series, and the 9500XL is 3V3, for example). Of the parts that > remain (and NOS XC9500 stuff), the prices are significant for the > paltry number of effective gates you get) > * Assuming you continue with a 3V3 part, you need to add voltage > translators. They're not all that expensive, but sometimes board > real estate on a small DIP-sized board can be a problem. The 9500XL series CPLDs are 3.3V devices, but their inputs are 5V-tolerant. The EasyFlash 3 uses a 95144XL with no additional voltage translators, the Chameleon actually uses a 9572XL (I think - it's from that series, but the exact device may differ) mostly as voltage translator for its non-5V-tolerant FPGA. > Another option that I have not looked at is a small fab run. If someone > had a synthesizable CIA, 6502, or VIC-II netlist, I'd be willing to > explore a small CMOS run. The netlist that was reverse-engineered by the visual6502 project has been successfully synthesized into an FPGA, see https://github.com/pmonta/FPGA-netlist-tools It may not be the best option for creating a new chip though - the original netlist probably won't work on anything but an NMOS process and the FPGA version is basically a parallel mixed-level (gate/switch) simulation of that netlist which needs a fast auxiliary clock (50+MHz) to run and uses a lot of space compared to a manually-implemented 6502 core in Verilog or VHDL. > It would no doubt cost many thousands (maybe too many to even > consider), but might be worth it for a community effort on high > value/high interest ICs if the price could be amortized over the > number of ICs produced. I think you're off by an order of magnitude or two. MOSIS has an online automated quote generator - 30 chips (minimum) in the ON Semi I2T30 process (0.7um CMOS, the largest in the list; no idea if it would be suitable) with 1mm^2 die size (random guess): 158160 USD (including overnight shipping) -ik Message was sent through the cbm-hackers mailing listReceived on 2012-02-28 00:00:40
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