Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Finite state machine - doesnt change state second time & glitch

I have a fairly simple state machine that when in idle state, if txval is high should take the data from input port, put txbus flag to 1, then write it to FT245 chip and when writing is finished and ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Im guessing its because the delay_next is set to 10 during the write_end state, and next state can only be assigned when the counter reaches 0. Hence you need to hold txval high until you're allowed to change state again.