9.4. Temporal Decoupling the Or1ksim Wrapper Class

9.4.1. Adding a Function to the Or1ksim Library to Support Temporal Decoupling
9.4.2. Or1ksimDecoupSC Module Class Definition
9.4.3. Or1ksimDecoupSC Module Class Implementation

The only thread that can be decoupled in the current model is the Or1ksim wrapper class, Or1ksimDecoupSC, since it is the only thread with a TLM 2.0 initiator socket.

ISS are natural candidates for temporal decoupling, since they often can run large blocks of code without any need for hardware interaction. This is particularly important for modern compiling ISS (e.g ARM SystemGenerator, ARC xISS), which achieve their performance by executing thousands of instructions at a time.

The changes needed to add temporal decoupling are:

Change the main thread, run so that it only tries to execute instructions up to the end of the current global quantum.
Change the upcall transport function, doTrans, so that it increments the local time offset, rather than synchronizing via wait.
Updates to the Or1ksim ISS library to support running to a fixed time point.

A new class, Or1ksimDecoupSC is derived from Or1ksimSyncSC to implement the required functionality.