Translating between memory transactions of first type and memory transactions of a second type

摘要

A data processing apparatus 2 includes bridge circuitry 14, 16, 18 which serves to translate memory transactions of a first type (AXI) into memory transactions of a second type (PCI Express). The bridge circuitry includes translation circuitry 18 which maps at least some of the bits of attribute data of a memory transaction of the first type to unused bits within the significant bits of an address of the second type, which are unused to represent significant bits of the address of memory transactions of the first type.