Extract AMBA APB

Use extract apb to inspect APB Setup, waited Access, and completed Access states. Select one concrete APB Completer interface before mapping its signals.

Which APB accesses occurred?

wavepeek extract apb --waves dump.fst \
  --scope tb.dut.uart_apb \
  --profile apb4 \
  --map pclk=clk \
  --map presetn=reset_n \
  --include '^uart_' \
  --from 5us --to 6us

Selected fields from representative rows:

@5010ns sample@5009ns [setup write] pwrite=1'h1 paddr=16'h0040 pwdata=32'h00000055 pstrb=4'h1
@5020ns sample@5019ns [access-complete write] pwrite=1'h1 paddr=16'h0040 pwdata=32'h00000055 pslverr=1'h0
@5100ns sample@5099ns [setup read] pwrite=1'h0 paddr=16'h0044
@5110ns sample@5109ns [access-complete read] pwrite=1'h0 paddr=16'h0044 prdata=32'h000000a5 pslverr=1'h0

The rows are independently sampled APB states. The extractor does not combine Setup and Access rows into transaction objects or decode register addresses.

Which accesses waited?

Add --include-wait in mapped-PREADY mode:

wavepeek extract apb --waves dump.fst \
  --scope tb.dut.uart_apb \
  --profile apb4 \
  --map pclk=clk \
  --include '^uart_' \
  --include-wait \
  --from 5us --to 6us

A separate access-wait row appears for each sampled Access cycle where PREADY is low. Omit the option when only Setup and completion matter.

What if PREADY is not present?

Use --pready-mode implicit-high only for an interface that physically omits PREADY. Do not map pready or request wait rows in that mode.

Map one concrete PSELx signal as psel; do not use a regex that merges several Completer selects into one interface. Run wavepeek help extract apb for profile-specific mappings and all mode options.