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Altera_Forum's avatar
Altera_Forum
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12 years ago

number of M9K

I have a meory with size 8704*32. Iw ant to implement it on Cyclone 3 device. Megawizard shows that I need 31 M9K+ some LUts for this memory. Fitter fails and asks for 34 M9K. Any idea?
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Hello,

I have a question on similar lines.. I have a memory with the configuration : 32 (width)x512 (depth). The sysnthesis shows that 12 instances of block RAM were inferred. The fitter report shows that:

M9Ks used are : 8

Total block memory bits = 6,144 / 5,621,760 ( < 1 % )

Total block memory implementation bits = 73,728 / 5,621,760 ( 1 % )

I have 2 questions.

1) Why are 8 M9Ks used ? So my total memory size is 512 * 32 = 16384.. which can be accommodated in just 2 M9K s right? I don't understand how Quartus is mapping the block RAMs.

2) What is the difference between Total block memory bits and Total block memory implementation bits ?

Looking forward to your reply.

Thank you.