CocoTB Framework · Verification Infrastructure for RTL Testing
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APB3 Components Overview¶

APB3 is implemented as a subclass of the APB4 BFMs. It exposes the same base signal set, but only PSLVERR is optional; PPROT and PSTRB are not part of the APB3 signal set and are not bound.

Components¶

APB3Master — drives APB3 transfers. Raises if a caller passes strb or pprot.
APB3Slave — memory-backed responder. Inherits the unified APB4 slave state machine.
APB3Monitor — passive observer that builds APB3Packet objects.
APB3Packet — packet class with the APB3 field set (pwrite, paddr, pwdata, prdata, pslverr).

Factory Functions¶

from CocoTBFramework.components.apb3 import (
    create_apb3_master,
    create_apb3_slave,
    create_apb3_monitor,
)

master = create_apb3_master(dut, "APB3_Master", "apb_", dut.clk)
slave = create_apb3_slave(dut, "APB3_Slave", "apb_", dut.clk, registers=1024)
monitor = create_apb3_monitor(dut, "APB3_Monitor", "apb_", dut.clk)

Packet Construction¶

from CocoTBFramework.components.apb3 import APB3Packet

write_pkt = APB3Packet(pwrite=1, paddr=0x100, pwdata=0xAB)
read_pkt = APB3Packet(pwrite=0, paddr=0x100)

PSTRB and PPROT kwargs are ignored if accidentally passed.

Signal Set¶

Signal	Direction (master)	Optional in APB3
PSEL	out	no
PENABLE	out	no
PWRITE	out	no
PADDR	out	no
PWDATA	out	no
PRDATA	in	no
PREADY	in	no
PSLVERR	in	yes

APB3 lives in src/CocoTBFramework/components/apb3/ and is tracked as issue #87.