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Altera_Forum's avatar
Altera_Forum
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19 years ago

Memory bits

Hi, I am using a cyclone 1 FPGA chip having about 290,000 memory bits. After I finished my design and while compilation with quartus, I get get an error printing the following message :"Error: ...
Altera_Forum's avatar
Altera_Forum
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19 years ago

You can't count bits and determine how much more is available unless you are using all 9 bits of each byte. A 64x1 memory will consume all 4096+512 bits of an M4K just as a 512x9 will, but you only use 64 bits vs 4608, losing 4544 bits. If you are that tight on resource usage you will need to plan your design a bit more carefully. Remember that NIOS and JTAG UART with cache both use M4K as well as your added logic.