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dmolinagarcia / 74HCT6526

74HCT6526
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IRQ clears too late #11

Closed dmolinagarcia closed 1 year ago

dmolinagarcia commented 1 year ago

image

When the ICR is read, the IRQ flag takes two additional cycles before clearing.

dmolinagarcia commented 1 year ago

I think, resetting the IRQ FF with the output of the first clear FF will do. This may however force me to user a latch instead of the 244 buffer.

dmolinagarcia commented 1 year ago

Could this be the cause for 02 fail? I am clearing too late, so I may be missing some wanted IRQ/ICR bits?

dmolinagarcia commented 1 year ago

Even though I think I'm still clearing one cycle late. So far it doesn't seem a problem.

Closing for now.