phoenyxu
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hi all
In my designs, there are several clocks, such as 125M, 260M. the precondition is we have vcd file. if I set the frequency as125M, it is 0.6W, while I set freq as 256, it will double, 1.2W.
1. In the User Guide: "For example, assume that there are thre e significant frequencies on the chip, and
they consume the following power: 100 MHz (5mw), 200 MHz (20mw), and 400 Mz
(70mw). The FREQUENCY value to be specified in this case would be 200 MHz,
even though a majority of the power is consumed at 400 MHz. Required. Default:
none. "
I dont understand why "The FREQUENCY value to be specified in this case would be 200 MHz, even though a majority of the power is consumed at 400 MHz". if there are 5 clocks, 100M, 150M, 200M, 250M, 400M. which will be used?
how to set the frequency for multiple clocks?
2. another questions?
can set I as the below:
FREQ: 150M
CLOCK_ROOTS {
CLK1 100M
CLK2 150M
CLK3 200M
CLK4 250M
CLK5 400M}
Will the responding FF/combination cells to the clock domain use the corresponding frequency?
or any other suggestions?
Many thanks for your help?
In my designs, there are several clocks, such as 125M, 260M. the precondition is we have vcd file. if I set the frequency as125M, it is 0.6W, while I set freq as 256, it will double, 1.2W.
1. In the User Guide: "For example, assume that there are thre e significant frequencies on the chip, and
they consume the following power: 100 MHz (5mw), 200 MHz (20mw), and 400 Mz
(70mw). The FREQUENCY value to be specified in this case would be 200 MHz,
even though a majority of the power is consumed at 400 MHz. Required. Default:
none. "
I dont understand why "The FREQUENCY value to be specified in this case would be 200 MHz, even though a majority of the power is consumed at 400 MHz". if there are 5 clocks, 100M, 150M, 200M, 250M, 400M. which will be used?
how to set the frequency for multiple clocks?
2. another questions?
can set I as the below:
FREQ: 150M
CLOCK_ROOTS {
CLK1 100M
CLK2 150M
CLK3 200M
CLK4 250M
CLK5 400M}
Will the responding FF/combination cells to the clock domain use the corresponding frequency?
or any other suggestions?
Many thanks for your help?