In-chip point-to-point interconnection bus access shielding system and method

Abstract

The invention discloses a system and a method for shielding access of a point-to-point interconnection bus in a chip. The method comprises the steps of recording an effective command quantity a transmitted in a write control channel and an effective command quantity b transmitted in a write data channel; when a bus shielding request sent by an external system is detected, shielding a read control channel command of the bus, and sending a read access shielding response signal to the external system; and when the bus shielding request sent by the external system is detected, comparing a with b, shielding the write control channel command and a write data channel command of the bus according to a write access bus shielding policy, and sending a write access shielding response signal to the external system. The designed bus shielding system is simple in structure, and the bus shielding process is quick, so that the time cost of waiting for completion of all bus accesses due to tedious software delay is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of interconnection bus design in a chip, in particular to an access shielding system and method for a point-to-point interconnection bus in a chip. Background technique [0002] With the advancement of VLSI technology, the design complexity of SoC chips continues to increase. Multi-core technology, multiple storage structures, stream data processing units, and various high-speed interface circuits are stacked in a single SoC chip. The data interaction between these SoC components Relying on the high-performance interconnection bus structure, the point-to-point interconnection bus has the advantages of high bandwidth, low latency, and easy timing convergence. It has been widely used in high-performance SoC chips, and the classic two-way sequential access bus based on the request-response working mode Different, the point-to-point bus usually adopts a one-way channel structure, so multiple bus accesses can be ...

AI Technical Summary

Problems solved by technology

[0004] In the classic bidirectional sequential access bus, the control signal and the data signal have a strict correlation. Before a complete bus access is completed, no new bus access is allowed. This strict sequence requirement makes the security shielding of the classic bus easy to implement. It only needs to simply shield the bus control signal. The point-to-point bus adopts a one-way channel structure. There is no strict correlation between the control channel and the data channel, allowing multiple bus accesses to be executed concurrently, which significantly improves the bus bandwidth, but brings difficulties to the security shielding of the bus.

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