The following figure shows simulation when Safe Clock Startup is true and Use Clock Sequencing is true, with the required sequence number in the table (consider sequence 1,2,3,4).
Figure 1. Simulation, when Safe Clock Startup is true and Use Clock
Sequencing
- After LOCKED is high,
clk_out1enables after 8 cycles to the first clock out the frequency of primitive.And after CLKOUT1 is high,clk_out2enables after 8 cycles to the second clock out the frequency of primitive. - After CLKOUT2 is high,
clk_out3enables after 8 cycles to the third clock out frequency of primitive. - After CLKOUT3 is high,
clk_out4enables after 8 cycles to the fourth clock out frequency of primitive.
This is useful if the clocks need to come in sequence.