An AXI bridge preserves or explicitly transforms the transaction contract. Width/protocol converters may split one upstream operation into downstream work and must return the correct upstream completion. ID remappers must retain enough source/order context for the upstream rules. An AXI-to-APB converter also serialises unsupported burst/concurrency features according to its documented policy.
An address-map mismatch is a high-value integration hypothesis. Depending on decode and default-target policy, symptoms can include DECERR, another error, a timeout or access to an unintended target; trace the accepted address and route rather than assuming one response.
Maintain a single address map source of truth shared by RTL, firmware, and DV.
Define unmapped-address behaviour explicitly; a responding AXI default target with DECERR improves diagnosis when it fits the system security/safety policy.
Define reset/start-up admission: hold, backpressure or reject requests until the destination path can honour them.
Maintain a single address map source of truth shared by RTL, firmware, and DV.
Define unmapped-address behaviour explicitly; a responding AXI default target with DECERR improves diagnosis when it fits the system security/safety policy.
Define reset/start-up admission: hold, backpressure or reject requests until the destination path can honour them.