Create a VAX CPU with FPGA?
pkoning at equallogic.com
Fri Mar 4 17:04:13 CST 2005
>>>>> "9000" == 9000 VAX <vax9000 at gmail.com> writes:
9000> There are many "soft CPUs" around. I wonder how hard it is to
9000> create a soft VAX CPU core that can be load into an FPGA. Other
9000> than to design from scratch, I think it might be easier if we
9000> grab the VAX-11/780, 750, or 730 schematics, and throw them
9000> into an FPGA compiler. The 780 was implemented with TTL, the
9000> 750 with gate array, and 730 with AMD 2901. I think the 730
9000> scheme might be the easiest to implement with an FPGA.
You'd also need the microcode. The schematics will only give you the
micro-engine. The microcode is what turns that into a VAX.
I suppose you could do a VAX in hardwired logic, but that would be
HARD given the instruction set. A bit easier if you use the minimum
subset, I suppose.
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