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Altera_Forum
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15 years ago

a problem about the memory size of onchip memory

How to design the memorysize of the onchip memory? when i was compilating my design , i saw a message "Error: Selected device has 105 RAM location(s) of type M4K. However, the current design ne...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

The Cyclone II EP2C35 has 105 M4K OnChip memory blocks. Each M4K has 4096 bits + 512 parity bits. Speaking of bytes, each M4K block has 512bytes (no parity), so if you use more than the available memory blocks, your design requires more than 105 x 512 bytes.

so you have 3 options.

1. use a bigger fpga if possible

2. reduce the memory usage

3. check the quartus settings, maybe some memory blocks can be swaped to registers.