CAN bus controller circuit with transmitting FIFO

Abstract

The invention discloses a CAN bus controller circuit with transmitting FIFO. The circuit mainly comprises an interface management unit, the transmitting FIFO, apointer storage FIFO, a transmitting control logic unit, a transmitting buffer, a transmitting counter and a CAN bus controller. The circuit has the advantages that the transmitting FIFO internally comprising 128 bytes can continuously write in transmitting CAN bus information in a using process; if transmitting data of each frame has 8 data bytes, the transmitting data has 13 data bytes in total plus frame information and identification codes, transmitting information of at most 9 frames can be written in once when transmitting CAN bus data is written, but a common CAN bus controller can only write in CAN bus data of a second frame after CAN bus data of one frame is transmitted. According to the circuit, when the CAN bus data is transmitted, the transmitting efficiency is greatly improved; the use is very convenient.

Description

technical field [0001] The invention belongs to the technical field of bus conversion in semiconductor integrated circuits, in particular to the design of a dedicated integrated circuit for CAN bus protocol conversion. Background technique [0002] CAN (Controller Area Network) bus is a multi-host local area network launched by BOSCH for modern industrial applications, which belongs to the field bus category. With the development of computer technology, communication technology, network technology and intelligent sensor technology, CAN bus technology plays an increasingly important role in the field of industrial control. However, the traditional CAN bus only has the receiving FIFO, but not the sending FIFO. The sending buffer is realized by writing the register, that is, the sending frame information, identification code and sending data are written into the corresponding CAN bus address when sending data, and the CAN bus The corresponding value is read internally through ...

AI Technical Summary

Problems solved by technology

But this kind of CAN bus circuit has a disadvantage. Since one frame of data contains at most 1 frame information, 4 sending identification codes, and 8 sending data, that is, at most 13 CAN messages can be sent at a time. If you want to send multiple frames of data, you need After the 13 data transmissions of the previous frame are completed, write the corresponding register address before continuing to send, which affects the sending efficiency

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