scu（snoop control unit）
2014年05月05日 16:07:09
阅读数：3112
在ARM芯片上看到SCU这个模块，不知道是什么意思，搜了下，结果：
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0407e/BABFAHID.html
我的理解（仅供参考，可能错误）：维护多CPU核之间的数据缓存的一致性，主要作用是CPU控制缓存的操作。
Chapter 2. Snoop Control Unit
This chapter describes the Snoop Control Unit (SCU).It contains the following sections:
AMBA AXI Master Port Interfaces
Event communication with an externalagent using WFE/SEV.
The SCU connects one to four Cortex-A9 processors to the memory system through the AXI interfaces.
The SCU functions are to:
maintain data cache coherency between the Cortex-A9 processors
initiate L2 AXI memory accesses
arbitrate between Cortex-A9 processors requestingL2 accesses
manage ACP accesses.
https://blog.csdn.net/xzongyuan/article/details/25057207
