Reordering technology for PCIE (Peripheral Component Interface Express) application layer interface

Abstract

The invention relates to a reordering technology for a PCIE (Peripheral Component Interface Express) application layer interface. Received data and information to be stored are stored by using an external memory; flag bits (TAG numbers) of a packet before and after segmentation are recorded by using a lookup table (lut), and an internal TAG number is added to firstly convert all received request packet identification numbers (ID number) into different internal identification numbers (Internal TAG). Thus, the problems caused by blockage in the conventional scheme are completely solved, the working speed is improved, and the problem of disorder of packets can be solved.

Description

technical field [0001] The invention relates to a reordering technology for a PCIE application layer interface. Background technique [0002] With the increasing speed of computer operation, the third generation of computer I / O technology, that is, PCIE bus technology, has been proposed. Compared with the traditional PCI bus technology, PCIE has different degrees of performance improvement in terms of bandwidth, delay, and speed. [0003] The hard core of PCIE includes PCIE physical layer, PCIE data link layer and PCIE transaction layer. The PCIE transaction layer is responsible for sending and receiving packets and performing corresponding error detection. The PCIE transaction layer belongs to the highest layer of the hard core, and communicates with the application layer through a bus connection. [0004] Compared with the Advanced High Performance Bus (AHB) bus, the new Advanced Extensible Interface (AXI) bus protocol proposed by ARM has better performance. The AXI bus...

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Problems solved by technology

[0012] The purpose of the present invention is to overcome the above-mentioned deficiencies, provide a kind of reordering technology for PCIE application layer interface, solve the problem caused by blocking in the existing solution, improve the working rate, and can solve the out-of-sequence problem of the packet

[0013] The purpose of the present invention is achieved like this: a kind of reordering technology that is used for PCIE application layer interface, the ID number of request packet (Internal TAG) is all converted into different Int TAG number request packets by intermediate identification position, solves prior art The problem of inefficiency caused by blocking subsequent request packets; ID number lookup table (ID-Int lut) and PCIE lookup table (Int-PCIE) lut stores the relationship between ID number and Int TAG and the relationship between Int TAG and PCIE TAG It is convenient to perform corresponding inverse transformation when receiving the completion packet, so as to ensure in-order reception

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