tq multicycles
multicycles
1. determining multicycle relationship in 5 steps
1.1 default setup relationship = set_multicycle_path -setup 1
1.2 setup relationship = default_setup_relation + (MC_SETUP_VALUE -1)*clock_period;
1.3 source-synchronous interface : MC_SETUP_VALUE maybe 0
1.4 -start : launch<-- back, -end : latch--> forward; mutually exclusive
1.5 hold relationship is determined from the setup relationship, even if the setup relationship was modified with a multicycle.
1.6 the default hold relationship follows the setup relationship with multicycles, is called 0 edge
1.7 hold relationship: -start : launch--> forward, -end : latch<-- back,
2. two common sense to use the multicycles
2.1 open the window : clock enable
2.2 shift the window : pipeline
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