CDMA2000基站模块中PCI和Local总线冲突问题的研究

Data Transfer between PCI Bus and Local Bus in CDMA2000 Base Station Transceiver

CDMA2000 BTS(基站收发信机)中的信道处理模块与主控模块之间的通信存在异常导致系统无法启动。为了找出故障的根源,对基站系统进行逐层深入的分析,并且进行了大量的时序测试工作。故障最终定位为数据在PCI总线与Local总线之间转移时存在冲突,产生了一个异常的重读操作,导致基于FIFO架构的存储数据存在丢失。问题的定位对于研究CDMA2000基站的架构、对于正确应用PCI和Local总线,具有参考价值。

The communication between channel processing module and main control module became abnormal in CDMA2000 BTS（Base Station Transceiver）, which caused the system cant boot up. In order to find out the root causes of the fault, in - depth analysis and lots of timing tests to the Base Station system were necessary. In the end, it found that there was some collision for data to transfer between PCI bus and Local bus, so that an unexpected duplication of read operation happened, which caused the loss of memory data based on FIFO. The way to solve the fault could be of great practical value to research the CDMA2000 BTS, and to apply PCI bus and local bus correctly.