3 ms·
Why do they use large slow shift register for I/O? Cannot it be done the other way, for example: use parallel inputs and supply them to all designs simultaneous
by codedokode 4y ago
Why do they use large slow shift register for I/O? Cannot it be done the other way, for example: use parallel inputs and supply them to all designs simultaneously, and use large 250x1 multiplexer to read outputs?
Also one can reuse that shift register as 250 bytes of sequential access memory, although I guess this technology which has been used in Soviet calculators has been long forgotten.
- Taniwha 4y agoI don't know the original reason for choosing the shift register, might have been that it involved lots of short wires between flops so the timing is easier to get right - but essentially they will switching to the big mux/etc next time around