DMA (direct memory access) read-write request order-preserving processing method for PCIE (peripheral component interface express)

The invention relates to the technical field of high-speed interconnection buses of computer peripheral equipment, in particular to a PCIE (Peripheral Component Interface Express)-oriented DMA (Direct Memory Access) read-write request order-preserving processing method. Comprising the following steps of: setting an ROQ (Read Only Memory) in an order-preserving module ROM (Read Only Memory), judging the format of a DMA (Direct Memory Access) read-write request packet sent by a superior module, and judging whether the request is a strong-order requirement or a weak-order requirement; the requests with strong sequence requirements are sent to the ROQ to be sorted and suspended, and the requests with weak sequence requirements are directly accessed to the Bypass path and do not need to be sent to the ROQ; the strong-sequence requests in the ROQ queue and the weak-sequence requests in the direct Bypass path are sent out after rotation arbitration, and the principle that the weak-sequence requests must pass through