Parallel-serial conversion circuit and device applied to high-speed interface physical layer chip

Abstract

The invention belongs to the technical field of high-speed parallel-serial conversion design, and provides a parallel-serial conversion circuit applied to a high-speed interface physical layer chip, comprising: a phase-locked loop, a parallel data sampling unit, a data selection and distribution control unit, a first serial A row register, a second serial register, and a differential serial data generating unit. According to the first clock and the second clock, the parallel data sampling unit is used to sample the parallel data to generate the odd-numbered parallel data and the even-numbered parallel data, and the odd-numbered parallel data and the even-numbered parallel data are converted by the data selection and distribution control unit into The odd-numbered serial data and the even-numbered serial data are processed by the differential serial data generating unit, and the differential serial data is finally output. Using the design method of pure digital circuit, through the circuit structure design of parity circuit, the internal frequency of the chip is reduced, and the IP multiplexing of the parallel-serial conversion circuit of the high-speed interface physical layer under different processes can be better realized.

Description

technical field [0001] The invention belongs to the technical field of high-speed parallel-serial conversion design, and in particular relates to a parallel-serial conversion circuit and device applied to a high-speed interface physical layer chip. Background technique [0002] At present, high-speed interfaces are used more and more widely, and the physical layer interfaces of many protocols (such as PCIe, USB, SATA, SRIO, etc.) are implemented by serializer-deserializer (Serializer-Deserializer, SerDes) technology. However, the realization of the physical layer of the high-speed interface has always been a difficult problem in the design of the industry due to the need to design a mixed circuit of digital and analog. As an important part of SerDes circuit design, parallel-serial conversion circuit is used to transmit serialized differential data. Its design quality will directly affect the performance of the SerDes sending port. Most of the existing parallel-serial conve...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a parallel-to-serial conversion circuit and device applied to high-speed interface physical layer chips, aiming to solve the problems of complex circuits, easy generation of internal noise and delay in output differential signals in traditional technical solutions difference problem

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