【AMBA AHB总线专题讨论】

adsstpz123

AMBA总线协议，不错

yonguestc

看完整个帖子，不错，顶一下，

rot

zan.....

chenfeieist

很有用的东西。

breezee123

小弟最近学习一款ARM CPU在FPGA上进行仿真，在替换FPGA模型过程中RAM和ROM均不能正确仿真，经检查是RAM和ROM均有一个时钟周期的延时。想来想去是不是需要在AMBA上修改信号参数，如设置输出传输响应信号HREADYOUT向后延时一个周期。但是小弟不知道的是应该怎样修改verilog代码。

lulanlanily

各位大神，小的刚看完AMBA spec，有点问题不明白，请帮帮忙，指点一下，谢谢啦！

上图中的传输大小比如写的话是写入的大小，DATA是写数据总线的四个通道，addressoffset是什么意思，怎么计算出来的？

lulanlanily

回复 486# lulanlanily


    这个我自己弄明白了

lulanlanily

有哪位前辈知道
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。
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？
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？

dwm1235

回复 487# lulanlanily


    解释一下那个表格的问题呗

cici520