【AMBA AHB总线专题讨论】

zhb129

回复 488# lulanlanily

1. 在exclusive access中这段话的意思吗？
The minimum number of bytes to be monitored during an exclusive operation is defined by the length and size of the transaction. It is acceptable to monitor a larger number of bytes, up to 128 which is the maximum of an exclusive access. However, this might result in occasions when the exclusive access is actually successful but is indicated as failing because a neighboring byte was updated.最后一句话是怎么理解。//我的理解，独占访问时，检测的最小字节数就是这个brust的长度，如果要要检测独占访问的最大长度，也是可以的。但是这可能导致一个本来成功的独占访问被误作为失败，因为你检测的范围超出了本次独占访问，那么相邻的字节被改写的话，会被视作失败。


2.A slave that supports exclusive access must have monitor hardware. It is recommended that such a slave has a monitor unit for each exclusive-capable master ID that can access it. A single-ported slave can have a standard exclusive access monitor external to the slave, but multiported slaves might require internal monitoring.这里的监视的是master ID ，它和ARID，AWID中的ID有什么区别？到底监视的哪个？
//就是master发出的ID，AWID，ARID都属于masterID。

3.The value of the ARCACHE[3:0] or AWCACHE[3:0] signals must guarantee that the slave that is monitoring the exclusive access sees the transaction. For example, an exclusive access being monitored by a slave must not have an ARCACHE[3:0] or AWCACHE[3:0] value that indicates that the transaction is cacheable.这段话是怎么理解的？
//没搞懂

gongcen123

收藏了

gongcen123

协议中，说到，地址译码器是将HADDR信号的高位进行译码，这是为什么呢？HADDR信号的构成是什么呢？

mzq920426

我最近刚开始看AMBA总线，想问下在不定长的情况下如何判定hgrant信号应该什么时候变为低电平（master1和mater2优先级相同），也就是说如何切换master1和master2。定长的时候通过HBURST信号可以知道，希望大神解答

sunyzz

老扁很牛！！！

xiaocheng12345

学习了

xiaocheng12345

都说的很好啊

michxia

回复 493# gongcen123


    HADDR就是总线地址信号，高位译码决定选中哪个device，低位是这个device的存储空间，在device内部再译码。希望不是我把你的问题简单化了。

mcuxp

高手真多

amhere

回复 406# 老扁


   牛逼