Questions tagged [homebrew-cpu]

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votes
1answer
54 views

How to optimise a logic circuit? [closed]

I have the following 15 sets of binary outputs: ...
0
votes
1answer
44 views

Designing a Carry lookahead unit using EEPROMs, creates osclillator

I have read something about CLUs (Carry lookahead units) and want to build one. I have settled on design using eeproms as adders ...
2
votes
2answers
114 views

Approaches to storing and addressing microcode for homebrew CPU

I've been teaching myself about CPU architecture for a while now and have successfully designed a couple myself. They were always based around microcode to drive the CPU's control lines. The ...
0
votes
1answer
69 views

RISC-V: building a datapath for conditional Branch instructions

I am simulating a multi-cycle 32bit RISC-V CPU in Logisim-Evolution and so far so good, i had implemented almost every instruction from the basic RV32I ISA. But im having trouble to understand how the ...
3
votes
1answer
79 views

Building a byte-addressable memory

I am building a memory module: 32 bits wide, parallel, and, byte-addressable. I did a research and i could not find an memory IC that will suit my needs. It ...
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, ...
0
votes
0answers
66 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 ...
0
votes
1answer
135 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
132 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 ...
7
votes
3answers
507 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....
1
vote
1answer
67 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
75 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 ...
2
votes
1answer
312 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 ...