ProASIC3 DC and Switching Characteristics
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v1.4
Combinatorial Cells Contribution—PC-CELL
PC-CELL = NC-CELL* α1 / 2 * PAC7 * FCLK
NC-CELL is the number of VersaTiles used as combinatorial modules in the design.
α
FCLK is the global clock signal frequency.
Routing Net Contribution—PNET
PNET = (NS-CELL + NC-CELL) * α1 / 2 * PAC8 * FCLK
NS-CELL is the number of VersaTiles used as sequential modules in the design.
NC-CELL is the number of VersaTiles used as combinatorial modules in the design.
α
FCLK is the global clock signal frequency.
I/O Input Buffer Contribution—PINPUTS
PINPUTS = NINPUTS * α2 / 2 * PAC9 * FCLK
NINPUTS is the number of I/O input buffers used in the design.
α
FCLK is the global clock signal frequency.
I/O Output Buffer Contribution—POUTPUTS
POUTPUTS = NOUTPUTS * α2 / 2 * β1 * PAC10 * FCLK
NOUTPUTS is the number of I/O output buffers used in the design.
α
β
FCLK is the global clock signal frequency.
RAM Contribution—PMEMORY
PMEMORY = PAC11 * NBLOCKS * FREAD-CLOCK * β2 + PAC12 * NBLOCK * FWRITE-CLOCK * β3
NBLOCKS is the number of RAM blocks used in the design.
FREAD-CLOCK is the memory read clock frequency.
β
2 is the RAM enable rate for read operations.
FWRITE-CLOCK is the memory write clock frequency.
β
3 is the RAM enable rate for write operations—guidelines are provided in Table 2-17 on PLL Contribution—PPLL
PPLL = PDC4 + PAC13 *FCLKOUT
FCLKOUT is the output clock frequency.
1
1.
The PLL dynamic contribution depends on the input clock frequency, the number of output clock signals generated
by the PLL, and the frequency of each output clock. If a PLL is used to generate more than one output clock, include
each output clock in the formula by adding its corresponding contribution (PAC14 * FCLKOUT product) to the total PLL
contribution.