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I am confused ALM usage shown in the resource usage report. My understanding is that all other columns such as ALUT, LUT_REG, MEM_LUT, etc. are all part of the ALM. So in my resource estimates and counts, if I use the ALM count then I should be covered. But the nos. do not add up. Take for example this simple line from my design...
http://dl.dropbox.com/u/5702055/alm_cnt_does_not_addup.gif I cannot understand why the (ALUT + Dedicated Logic Registers)/2 is not same as the ALM count. What is it that I am missing?
TIA for insights...
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Hi,
your calculation would mean that the registers and logic is placed in separate ALUT's, but that is not true. You can see this in more detail by displaying 3 more columns in the project navigator.
Go to the project navigator and click into the entity column and choose "Custominze Columns". Add three entries:
1. "Combinatorial with no register ALUT" ( only the LUT ist used)
2. "Register-only ALUT" (only the register ist used)
3. "Combinatorial with register ALUT" ( Lut and register is used"
The sum is the number of used ALUT's and divided by 2 is the number of ALM.
Kind regards
GPK
Honored Contributor
