Search found 5 matches

by mcostalba
Sun Sep 13, 2015 11:24 am
Forum: Circuit Talk
Topic: Yet another RISC CPU
Replies: 8
Views: 17991

Re: Yet another RISC CPU

Hi Hans. I have replied in pm.
by mcostalba
Sun Jul 26, 2015 4:25 am
Forum: Circuit Talk
Topic: Yet another RISC CPU
Replies: 8
Views: 17991

Re: Yet another RISC CPU

Yes, I allow public editing for people to have some fun with it.

I have no more software examples, I have switched to implement a hardware multiplier (radix 4 booth), I have almost finished it, then stopeed due to no free time. But if people is interested I can post it.
by mcostalba
Mon Jun 22, 2015 11:03 pm
Forum: Circuit Talk
Topic: Yet another RISC CPU
Replies: 8
Views: 17991

Re: Yet another RISC CPU

By the way, there is a more traditional macro assembler, where you can define your instructions in it. You can try it: https://bitbucket.org/EugeneLepekhin/fusion/downloads you will need to download Fusion.zip file. There is a documentation file there. Thanks, I will give it a try. BTW, speaking of ...
by mcostalba
Sat Jun 20, 2015 11:19 pm
Forum: Circuit Talk
Topic: Yet another RISC CPU
Replies: 8
Views: 17991

Re: Yet another RISC CPU

Here are the real instructions implemented in the CPU: ld, st -> Load / Store indirect through register and offset e.g. ld r2, r1, 5 (r2 = Mem[r1 + 5]) add, sub, and, or, xor, shl, shr, rol, ror -> 3 registers ALU op e.g. add r1, r2, r3 (r1 = r2 + r3) add, and, or, xor -> immediate ALU op e.g. add ...
by mcostalba
Fri Jun 19, 2015 11:04 pm
Forum: Circuit Talk
Topic: Yet another RISC CPU
Replies: 8
Views: 17991

Yet another RISC CPU

I have downloaded your very nice simulator few weeks ago and I had fun writing some stuff that I'd like to share for interested people. It is a very simple CPU, harvard style, 8 bit registers (4 registers with r0 set at zero) and 16 bit instructions, all instructions execute in 2 cycles. The most ...