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Altera_Forum
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18 years ago

FIR Cyclone2 M4K switch to Cyclone3 M9K No AUTO Block for storage

Using Quartus 7.2SP3 with the coressponding FIR. We have used Cyclone II Devices with a couple of FIR The FIR IP Tool wizzard currently does not have the feature to match device to project de...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

It may be instructive to check, how the RAM blocks are actually utilized in your design. Particularly with FIR filters, there may be a problem, that RAM blocks are used incompletely, in other words that some address lines of a 36-bit RAM blocks are unused. In this case, migrating from CII 128x36 bit blocks to CIII 256x36 blocks doesn't reduce block count respectively increases waste of memory. Coming Quartus V8.0 couldn't change this behaviour in any way.