User guide (AHB VIP)

Configuration (ahb_cfg)

Key knobs:

• mode: AHB_MODE_LITE or AHB_MODE_FULL (also settable via +AHB_MODE=...)
• Wait states (slave): allow_wait_states, min_wait, max_wait
• Error injection (slave): err_enable, err_addr_lo, err_addr_hi, err_pct
• Burst policy (master): allow_bursts, allow_wrap, max_incr_len
• Debug:
  • trace_enable (monitor prints concise transaction logs)
  • coverage_enable (monitor coverage sampling)

Debug workflow

Recommended bring-up:

1. Start with ahb_smoke_test (SINGLE transfers)
2. Enable stalls: ahb_wait_state_test
3. Enable burst stress: ahb_back_to_back_test / ahb_random_stress_test

Useful knobs:

• +UVM_VERBOSITY=UVM_HIGH for more UVM messaging
• +VIP_TRACE to enable transaction printing in the monitor/config

Scoreboard expectations

The scoreboard is a monitor-based reference model:

• Writes update expected byte-addressed memory using HSIZE and address lane mapping.
• Reads compare returned HRDATA against expected.
• Error responses skip read comparison.

Use +KVIPS_AHB_SB_WARN_UNINIT to highlight reads from unwritten locations.