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如何理解read-allocate / write-allocate in AXI4 spec

chinatiger

hi, experts:

AXI4 Memory attributes有: Read-Allocate / Write-Allocate.

请问：

它和L2 Cache的Read-allocate/write-allocate policy是一回事吗？

如果read miss，则会在L2 Cache中分配一个entry?

best wishes,

  • 0

    Hi chinatiger,

    >AXI4 Memory attributes有: Read-Allocate / Write-Allocate.

    AXI4中，对AxCACHE信号的定义作出了更新：

    AWCACHE[3]： Allocate

    AWCACHE[2]: Other Allocate

    ARCACHE[3]: Other Allocate

    ARCACHE[2]: Allocate

    详细介绍请看 0022E，Table A4-3和A4-4。

    >请问：

    >它和L2 Cache的Read-allocate/write-allocate policy是一回事吗？

    >如果read miss，则会在L2 Cache中分配一个entry?

    我假定“L2 Cache”指的是PL310。

    你的理解基本上是正确的。