Data switching device and read-back method

Abstract

The embodiment of the invention discloses a data switching device and a read-back method, wherein the data switching device comprises an RAM (Random Access Memory), a gate circuit, a CPU (Central Processing Unit), a logic circuit, a cache and a cache marker register. At first, the CPU configures the cache in advance so as to define a read-back table item that needs to be read from an exchange matching table saved in the RAM; when contents that are read from the exchange matching table by the logic circuit covers the read-back table item, the corresponding table item read from the exchange matching table is saved in the cache; and / or when information that is read from the exchange matching table by the logic circuit does not cover the read-back table item, the CPU sends a read-back request to the RAM so as to obtain the table item needing to be read from the exchange matching table and save the table item in the cache; and finally, the CPU queries the read-back table item in the cache, so as to perform debugging and locating. The data switching device and the read-back method are suitable for the field of a communication system.

Description

technical field [0001] The invention relates to the field of communication systems, in particular to a data exchange device and a readback method. Background technique [0002] Data exchange equipment often adopts a vertical and horizontal switching matrix crossbar structure, which can realize data exchange between any channels. In the crossbar structure, there are nodes between any channels, which means that any channel can exchange data. The crossbar needs an exchange configuration table to store the exchange information of each data in each channel. Since the exchange between any channels is to be realized, the scale of the exchange allocation table is proportional to the square multiple of the number of channels. [0003] Inside the device, the content of the exchange configuration table of the crossbar is written by the CPU, and it is required that the configuration table can be rewritten at any time. The logic circuit will access the exchange matching table during t...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a data exchange device and a readback method, which solves the problem that the area and power consumption of the exchange device are large when using the double-read and double-write RAM to implement CPU read and write operations.

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