gertk
Experienced Member
Yes I found out timing is crucial and datasheets can be very unclear... I now have replaced both the HC573 latches with 16V8 GAL's as 74F574 are hard to get and I didn't want to wait (...) hoping they might be a bit faster and edge triggered but now I can not even get those GAL's to work properly... Pfff.... They should latch on the rising edge of the clock signal but al I seem to get is 'transparancy'. Need to fiddle a bit more with those.
Also the datasheets of the SRAM chips I have are unclear on what signal the data is stored into the cell, only in the IS61C256 datasheet is an example of using the SRAM with /CE and /OE permanently low and it says the write cycle is then /WE controlled. And then I found out that my GAL16V8's programmed as latches didn't work
Also the datasheets of the SRAM chips I have are unclear on what signal the data is stored into the cell, only in the IS61C256 datasheet is an example of using the SRAM with /CE and /OE permanently low and it says the write cycle is then /WE controlled. And then I found out that my GAL16V8's programmed as latches didn't work