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4-kbyte boundary space

quy truong
Note: This was originally posted on 22nd August 2012 at http://forums.arm.com

Hi there,
when I read AMBA AXI4 specification, the spec shows that "Bursts must not cross 4KB boundaries to prevent them from crossing boundaries between slaves and to limit the size of the address incrementer required within slaves". I don't understand about the boundary of 4KB and the relationship between this boundary to the number of slaves in the system. Can you explain that for me?
Many thanks!
Parents
  • 0 Arm Employee Badge in reply to Chandan

    Shorter answer this time, "yes".

    However if you don't use all 4Gb of the address space, you should put a "default slave" in your system that will be selected whenever the address might stray into the unused portion of the 4Gb space.

    This "default slave" can then drive HREADY and HRESP back to the master, usually to signal an ERROR if the master has tried to read or write to those unused locations, or OKAY if the master is just signalling an IDLE transfer.

    JD

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  • 0 Arm Employee Badge in reply to Chandan

    Shorter answer this time, "yes".

    However if you don't use all 4Gb of the address space, you should put a "default slave" in your system that will be selected whenever the address might stray into the unused portion of the 4Gb space.

    This "default slave" can then drive HREADY and HRESP back to the master, usually to signal an ERROR if the master has tried to read or write to those unused locations, or OKAY if the master is just signalling an IDLE transfer.

    JD

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