Constraining Between Multiple Clock Domains

OUT1

Q

D

CLK_A

CLK_B

D

Q

D

Q

D

Q

• Define clock groups

  • NET CLK_A TNM=A_GRP;
  • NET CLK_B TNM=B_GRP;

• Define timing constraints

  • TIMESPEC TS_CLKA=PERIOD A_GRP 20;
  • TIMESPEC TS_CLKB=PERIOD B_GRP TS_CLKA*2;
  • TIMESPEC TS_CLKA2B=FROM:A_GRP:TO:B_GRP:20;
    

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