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Hello
I have a doubt about the cpld's Tpd.
I found the parameters of MAX7000, such as EPM7512, are 7.5ns, 10ns or 12ns. But after compilation, I found that the EPM7512AETC144-12's Tpd is 4.5ns, showing as below:
" Info: 2: + IC(4.800 ns) + CELL(4.500 ns) = 10.300 ns; Loc. = LC12; Fanout = 1; COMB Node = 'delay:inst6|LC_a'"
and I changed the part number as EPM7512AETC144-10, and recomplied, the report as below:
Info: 2: + IC(4.000 ns) + CELL(3.600 ns) = 8.500 ns; Loc. = LC12; Fanout = 1; COMB Node = 'delay:inst6|LC_a'
So for -10 speed devcies, the Tpd is 3.6ns.
Again, change the part number to EPM7256AETC144-5, and the report is below:
Info: 4: + IC(1.700 ns) + CELL(2.200 ns) = 12.400 ns; Loc. = LC9; Fanout = 1; COMB Node = 'delay:inst6|LC_c'
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Hi,
have look into
http://www.altera.com/literature/an/an094.pdf. Be aware that tpd is the Pin-to Pin delay, not the Macrocell delay.
Kind regards
GPK
Honored Contributor
