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Altera_Forum's avatar
Altera_Forum
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7 years ago

true dual port == 2 x M20Ks

Seems like invoking true dual port (2 R/W ports) doubles the M20K resources - is this correct and if so where is it documented? I don't see it mentioned in https://www.altera.com/en_us/pdfs/lit...
Altera_Forum's avatar
Altera_Forum
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7 years ago

Documentation is here:

http://quartushelp.altera.com/17.1/index.htm#reference/glossary/def_m20k.htm

where it claims that the single M20K width is restricted to 20b when in true dual port mode.

I speculate that the RAM cell shadows the memory contents in two halves and does some internal magic to appear as true dual port.

I just wish Altera was more explicit about the cost for using it.