CPLD I2C channel address allocation method and system for cascaded backboard

Abstract

The embodiment of the invention discloses a CPLD I2C channel address allocation method and system for a cascaded backboard, which comprise the following steps of: S1, enabling a link host to send a Start signal through an I2C channel and communicate the I2C channels of the whole link; S2, enabling the link host to send a first address and a read-write flag bit through an I2C channel, enabling theCPLD on the link backboard to receive the first address and judges, if the first address is 0000_000, resetting the I2C address of the CPLD on the whole link backboard, and if the first address is a default value, rewritting the I2C address of the CPLD on the link backboard; if the first address is not 0000_000 and the default value, enabling the link host to send a Stop signal through an I2C channel; and S3, circularly executing the step S1-S2 until the rewriting of the I2C address of the CPLD on the whole link backboard is completed. The problems that in the prior art, occupied cable connector pins are large, the production cost is high, and errors are prone to occurring in the production process are solved, and the problem that due to the fact that wiring equivalent load capacitance andwiring stub reflect signals, the influence on I2C signals is large is solved.

Description

technical field [0001] The invention relates to the technical field of server applications, in particular to a CPLD I2C channel address allocation method and system for a cascaded backplane. Background technique [0002] With the development of technology, the current cascaded CPLD (CPLD, Complex Programmable Logic Device, complex programmable logic device) method is widely used. For example, in the cascaded backplane, CPLD is used as the main control chip and communication chip to control the backplane. board functions and communicate with the upper and lower levels. In the cascaded backplane, the common communication method of CPLD is I2C (I2C, Inter-Integrated Circuit, I2C bus, which is a simple, two-way two-wire synchronous serial bus developed by Philips Company), and the I2C bus only needs two Line, the communication is very concise. [0003] The cascaded backplane also needs to allocate addresses for each CPLD. There are two solutions in the prior art, both of which...

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Problems solved by technology

[0007] The embodiment of the present invention provides a CPLD I2C channel address allocation method and system for a cascaded backplane to solve the problems in the prior art of occupying too many cable connector pins, high production cost, and error-prone in the production process. And the problem that the equivalent load capacitance of the wiring and the reflection of the signal by the wiring stub have a great impact on the I2C signal

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