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Altera_Forum's avatar
Altera_Forum
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15 years ago

not fit issue need your help

Error: Selected device has 26 RAM location(s) of type M4K. However, the current design needs more than 26 to successfully fit Info: List of RAM cells constrained to M4K locations Info: Node " ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Memories can only be cobined if the address lines are running in parrallel. With fifos the whole point is that each fifo is run independently, so memory optimisation cannot occur (unless all of the write/read enables are driven from the same source).

Hence why its given each fifo it's own memory.

The fix would be to use no more than 26 fifos, or combine the words to more than 1 bit.