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Altera_Forum's avatar
Altera_Forum
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13 years ago

NIOS II On-chip Memory size

Hi, I am using DE0 board with Cyclone III FPGA. If I am not wrong, it has 56 M9K blocks. According to my calculation, it gives 57344 bytes for me to use as on-chip RAM for my NIOS II processor....
Altera_Forum's avatar
Altera_Forum
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13 years ago

Some of the memory blocks are used by the processor itself.

The registers use one.

Any data/instruction caches will use some.

The branch prediction tables will use at least one.

Any boot code will use some.

The JTAG debug will use some.

Also be aware that quartos may give a 'memory used' total in bits - which doesn't include all the 'wasted' bits inpartially used blocks.