Forum Discussion

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

headache with 2 process state machine

Hi everyone, below is the code from a state machine. It is a intended emulate one part of a system to test the other part, so all it is doing is sending rows and columns of data (and looking f...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

The latch issue is brought up by assigning other signals than NextState in the asynchronous process, and assigning them only in some of the states. Besides generating a lot of warnings, you can be rather sure that constructs like "index<=index+1;" will never work based on latches.

A simple solution, although not usually suggested in the text books is to change the design to a single synchronous process state machine, simply merging both processes.