Questions tagged [homebrew-cpu]

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14
votes
4answers
4k views

FPGA CPUs, how to find the max speed?

I'm just getting into FPGAs, and if I understand correctly, you are connecting logic gates together using code. So if I design a CPU in Verilog, it should connect some logic gates together and work, ...
7
votes
3answers
458 views

Why are the SRAM data and address pins numbered? [duplicate]

As far as understand, it would make no difference to the operation of an SRAM if you mixed up the order of the address or data pins. E.g. http://www.farnell.com/datasheets/1911297.pdf?_ga=2.220805788....
2
votes
1answer
291 views

What was the use-case for the 74hc590?

The 74hc590 http://www.ti.com/lit/ds/symlink/sn74hc590a.pdf is a binary counter followed by a register with a tri-state output. I thought about using it an a (homebrew cpu) design, as it's wider than ...
1
vote
1answer
62 views

Electrical properties of a stack of strip board connected by through-hole pins/sockets

I'm aware that breadboards have a limit of 1-2MHz. I think this is because of capacitance. Are there similar limits for a stack of stripboard connected by through-board sockets/pins? Would breaking ...
1
vote
1answer
71 views

Would a parallel EEPROM ever output a value that it does not contain?

I understand that when the address input to a parallel EEPROM changes from A to B, the output may show results that aren't the contents of either A or B, for a few nanoseconds. Are these spurious ...
0
votes
1answer
130 views

Home-brew cpu ram

I’m trying to build a cpu out of ttl logic chips. I’ve just about got everything finished, however, I’m still working on the ram. I don’t have any suitable ram chips I can use, however, I do have a ...
0
votes
2answers
123 views

Power issues on TTL circuit

I am building a homebrew 8-bit computer on breadoards and PCBs with TTL logic IC's (LS, HCT and ALS families). This is a small portion of the circuit (3 modules): I'm using an ordinary phone charger ...
0
votes
0answers
63 views

Home brew CPU register trouble shooting

update Apparently I’m an idiot. It took me this long (hours) to check the supply voltage of the flip flops, which was at .25 volts from a bad connection. Rookie mistake. Hard lesson learnt. In the ...