This policy is active when *VALID is detected to be asserted.
When enabled, it drives the *READY Low for low_time and then drives the *READY High until either
event_count handshakes have been received OR event_count_reset number of cycles have passed. The policy
repeats until the channel is given a different policy.
Figure 1. GEN_AFTER_VALID_EVENTS/RAND_AFTER_VALID_EVENTS
