Method for achieving data interaction between boards through two-line encoding and decoding and localbus mutual conversion

Abstract

The invention provides a method for achieving data interaction between boards through two-line encoding and decoding and localbus mutual conversion. The method especially adapts to the mutual conversion with the localbus in electronic equipment so that the single board with a CPU can conveniently access the single board without a CPU. Compared with the prior art, the method has the following advantage that the efficiency and space are both greatly improved compared with existing SMI bus access registers. According to the method, when the two-line bus format accesses the addresses, greater than16-Bit, of registers, not only can the frequency of triggered address writing operations is one less than that of an SMI bus protocol, but also the access efficiency is improved; moreover, the address space of the accessible registers is larger and not limited within 16-Bit.

Description

technical field [0001] The present invention is a two-line codec and localbus mutual conversion method to realize inter-board data interaction, relates to the field of electronic equipment cost saving, more specifically, is a method between two cross-board programmable logic devices Only use two-line codec and localbus to exchange to achieve a large amount of data interaction. Background technique [0002] Today, with the rapid development of low-end communication equipment, the competition among communication equipment manufacturers is becoming more and more fierce. When the functions all meet the requirements, the most intuitive manifestation of the competition is the price. Whoever occupies the price advantage wins the market. Therefore, in every process of product design, the concept of cost saving is essential. [0003] At present, the traditional method for a single board in a communication device to access localbus equipment on this board is to place a CPU on the boa...

AI Technical Summary

Problems solved by technology

The SPI bus is a 3-wire protocol. If the number of connector pins between two boards is relatively small, using one more pin will result in an additional connector device and increase equipment costs.

I2C and SMI will have an advantage in terms of the number of buses. They are both two-wire serial buses, but the encoding and decoding of the I2C protocol is more complicated and takes up more logic resources.

The SMI protocol is relatively simple, and the logic resources occupied by encoding and decoding are not many, but the disadvantage is that reading and writing a register with a 16-bit address requires two bus operations to complete, and the access efficiency is low, and the address space of the register can only reach 64K, and cannot be expanded.

[0004] To sum up: in the prior art, on the one hand, the use of CPU leads to the increase of equipment cost, and on the other hand, there is a problem of limited access register address space in the SMI bus protocol, which is representative of the two-line serial port protocol after removing the CPU.

Therefore, the current bus protocol cannot achieve access to address spaces above 64K

Images