Module axi_atop_filter

Filter atomic operations (ATOPs) in a protocol-compliant manner.

This module filters atomic operations (ATOPs), i.e., write transactions that have a non-zero

aw_atop value, from its slv to its mst port. This module guarantees that:

1. aw_atop is always zero on the mst port;

2. write transactions with non-zero aw_atop on the slv port are handled in conformance with

   the AXI standard by replying to such write transactions with the proper B and R responses.

   The response code on atomic operations that reach this module is always SLVERR

   (implementation-specific, not defined in the AXI standard).

Intended usage

This module is intended to be placed between masters that may issue ATOPs and slaves that do not

support ATOPs. That way, this module ensures that the AXI protocol remains in a defined state on

systems with mixed ATOP capabilities.

Specification reminder

The AXI standard specifies that there may be no ordering requirements between different atomic

bursts (i.e., a burst started by an AW with ATOP other than 0) and none between atomic bursts

and non-atomic bursts [E2.1.4]. That is, **an atomic burst may never have the same ID as any

other write or read burst that is in-flight at the same time**.

AXI ID width

Maximum number of in-flight AXI write transactions

AXI request type

AXI response type

Rising-edge clock of both ports

Asynchronous reset, active low

Slave port request

Slave port response

Master port request

Master port response