tree 51f5f9da62f5b35fc9aac3d69a5309035ab27ca8
parent 131a9c544c539e32488bc30284b7ef3f2604b5d2
author Alex Van Damme <atv@google.com> 1755634606 -0700
committer Alex Van Damme <atv@google.com> 1755713091 -0700

feat(bus): Add SECDED integrity for TileLink-UL

This commit implements SECDED (Single Error Correction, Double Error
Detection) for the TileLink-UL bus to ensure data integrity. The
implementation is compatible with OpenTitan's `prim_secded_inv` logic.

Key changes include:
- A parameterized `SecdedEncoder` Chisel module that supports 32-bit,
  57-bit, and 128-bit data widths. The 128-bit implementation uses a
  folded ECC scheme.
- `RequestIntegrityGen/Check` and `ResponseIntegrityGen/Check` modules
  to generate and verify integrity codes for the TileLink A and D
  channels.
- A Python-based golden model (`secded_golden.py`) for the SECDED
  logic to ensure correctness.
- A new `TileLinkULInterface` cocotb utility for simplified,
  transaction-based testing of the TileLink bus.
- Comprehensive cocotb tests that verify the `SecdedEncoder` against
  the golden model and test the full `TlulIntegrity` functionality,
  including fault injection.

Change-Id: I20a059b78a47699f145ae397b0e037d8c56dab69