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Altera_Forum's avatar
Altera_Forum
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10 years ago

Quartus 9.1 doesn't fit SCFIFO into M9K blocks, it prefers LEs. Why?!

Hi All, I've used the project Nios II UDP Offload Example (http://www.alterawiki.com/wiki/nios_ii_udp_offload_example) on a Cyclone III dev kit, using Quartus 9.1. It seems to work well. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

I'd like add only one thing, for the second project, the one with the reduced logic.

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I made another project, just a test, reducing the logic of my original project. At the end of compilation I saw that Quartus was able to fit scfifo into M9ks. Scfifo took 4 M9Ks, and the design overall 123 M9ks.

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In this case, the report (Fitter-> Resource Section -> Ram Summary) shows scfifo memory type is AUTO and not M9K. Since scfifo is defined into the file altera_avalon_sc_fifo.v, is there a directive to force type memory to M9K to have always scfifo into this kind of blocks?