Earlier the future-work list mentioned "multi-flow fair sharing on a
single shared link" which was confusing — each wire has a single
source, so this isn't a real gap. The actual modeling story:
- Multi-stream merging at routers IS handled via per-in_port fan_in +
shared inbox + FIFO worker forwarding. Flits from different
upstream streams interleave at flit granularity naturally.
- What's NOT modeled: cycle-accurate arbitration policies (priority,
iSLIP), address-based PC selection at HBM CTRL (round-robin is
address-blind, so size-aligned concurrent transactions hit full
PC contention even when real-HW address striping would diverge),
sub-flit (32B) granularity, finite buffer backpressure, and bank
conflict modeling.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
ywkang
9beb140eaa