Scaled Simulation Timeouts - 4.0 English

QDMA Subsystem for PCI Express Product Guide (PG302)

Document ID
PG302
Release Date
2022-05-20
Version
4.0 English

The simulation model of the core uses scaled-down times during link training to allow for the link to train in a reasonable amount of time during simulation. According to the PCI Express Specification, rev. 3.0 (http://www.pcisig.com/specifications), there are various timeouts associated with the link training and status state machine (LTSSM) states. The core scales these timeouts by a factor of 256 during simulation, except in the Recovery Speed_1 LTSSM state, where the timeouts are not scaled.