Forum Discussion

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

Takes too long to get address

I'm writing a simple program that reads and writes to RAM. If I want to write, I provide the starting address and a valid signal and I write to memory starting at that address until valid is deasser...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

write enable should be applied at the same clock cycle as the write address. In your code, write enable is supplied from the port directly, but address registered and thus one cycle delayed. If address is a registered signal, write enable should be as well. But the address is already registered in the RAM block, so it can be assigned outside the clocked process code.