The realization of uvm:10.3.1 heartbeat function

1. In some protocols, the driver will send a heartbeat-like signal to the DUT at every time. There is no essential difference between the heartbeat packet and the ordinary bag is the common transaction. Two options:

1) generated in driver, send:

2) sequence implementation, invalid loop:

The above code is best not to use the absolute delay, but to use virtual sequence. Should be as follows:

The heartbeat packet has the highest priority, so grab.

2. Use virtual sequence:

3. Not as follows:

1) because the heartbeat sequence is an infinite loop, the above will cause the body to stop.

4.virtual sequence objection is revoked, main_phase stop, exit emulation, but heartbeat sequence really send, so also set in heartbeat:

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The realization of uvm:10.3.1 heartbeat function