Testplan (APB3/APB4)

This testplan maps example tests to protocol features. Example tests live under kvips/apb/examples/uvm_back2back/.

Bring-up / sanity

• apb_b2b_reset_sanity_test
  • Reset behavior and idle stability
• apb_b2b_smoke_test
  • Deterministic write/readback sweep (scoreboard + sequence check)

Protocol behavior

• apb_b2b_wait_state_test
  • Slave inserts wait-states; master holds control stable; monitor tracks wait cycles
• apb_b2b_back_to_back_test
  • Continuous transfers (no forced idle) by setting drop_psel_between=0
• apb_b2b_error_injection_test
  • PSLVERR injection by address range; scoreboard disabled to avoid expected-error reads

APB4-specific

• apb_b2b_apb4_strobe_mask_test
  • Directed PSTRB masked write update + readback check
• apb_b2b_apb4_pprot_variation_test
  • Randomizes PPROT values during traffic (coverage exercise)

Stress / regression

• apb_b2b_random_stress_test
  • Large randomized mix (reads/writes, wait-states, APB4 extras when enabled)

Modes

• APB4 mode: +APB_PROTOCOL=APB4 (default)
• APB3 mode: +APB_PROTOCOL=APB3 (APB4-only tests auto-skip)