A kind of range matching cam unit circuit and rcam memory composed of it

Abstract

The invention relates to the technical field of manufacturing of integrated circuits and provides a range matching CAM (Content Addressable Memory) unit circuit and an RCAM (Range Content Addressable Memory) composed of the range matching CAM unit circuit. According to the range matching CAM unit circuit, high-voltage swing is greater than a GERMC circuit in a range matching unit; a fifth NMOS (N-channel Metal Oxide Semiconductor) tube is in complementary combination with an MP1 of a first PMOS (P-channel Metal Oxide Semiconductor) tube; a grid electrode of the MP1 is connected with a D# end; a source electrode of the MP1 is connected with a third input SL; an MN6 of a sixth NMOS tube is in the complementary combination with an MP2 of a second PMOS tube; a grid electrode of the MP2 is connected with a D end; a source electrode of the MP2 is connected with a fourth input SL#; a node connected between the two combined tubes which are mutually connected in series is connected with the grid electrodes of an MN1 and an MN2 of a first NMOS tube and a second NMOS tube; a drain electrode of an MN3 of a third NMOS tube is connected with a second input GE path, and the grid electrode of the MN3 of the third NMOS tube is connected with the D# end. According to the range matching CAM unit circuit and the RCAM, the two PMOS tubes are introduced to change transmission tubes MN5 and MN6 into transmission gates so that the P-point voltage swing is improved and the voltage drain drain VDD can be reached, so that the transmission speeds of signals equal to a chain or greater than the chain are increased and the circuit speed is increased; meanwhile, the robustness of the unit circuit is also improved and the anti-noise capability is improved.

Description

technical field [0001] The present invention relates to the technical field of integrated circuit manufacturing, and more specifically, relates to a range matching CAM (Content Addressable Memory, Content Addressable Memory) unit circuit and an RCAM (Range Content Addressable Memory, Range Matching Content Addressable Memory) composed of the same memory. Background technique [0002] With the rapid development of Internet technology, network traffic continues to increase and network speed continues to increase, which requires Internet hardware equipment to be continuously updated to meet the needs of rapid network development. For an IPV4 data packet, the port lookup operation is usually completed by using an RCAM circuit, which puts forward higher requirements on performance such as speed and power consumption of the RCAM circuit. The design of high-performance RCAM circuit is of great significance to the support of high-speed network. Research on RCAM at home and abroad ...

AI Technical Summary

Problems solved by technology

The circuit significantly reduces the problem of leakage current in the matching unit, but the circuit’s anti-noise ability is not good due to the voltage drop of the threshold voltage in the internal nodes of the matching unit. limit

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