EPU (EPU STL module)

General Description

The EPU (Event Processing Unit) self-test validates that the processing unit signal path within the PPCA subsystem is functional.

The test generates a software event on each PU under test (in bypass mode), routes it through a COMBO combiner to the EPU IRQ Generator, and verifies that an interrupt status is asserted back on the Main CPU.

More Information

The test procedure for each PU in the specified range:

 1) Save the original PU, COMBO, and IRQ configurations.
 2) Configure the PU in asynchronous bypass mode.
 3) Enable SW event generation on the PU.
 4) Configure COMBO[0] to route the PU output as EVOUT[0].
 5) Configure EPU_IRQ[0] to use COMBO[0] output as interrupt source.
 6) Clear any pending interrupt, then generate a SW event (constant input = 1).
 7) Verify that the interrupt status is asserted.
 8) Clear interrupt, stop SW event, and restore original configurations.

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