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About SRIO swrite destination Address bit number

David Yang1
Intellectual 435 points

Hi,Ti guys,

I'm using C6678 srio, and happend to notice that the address domain in a swirte packet is 29bit, but a typical DSP address is 32 bit(like the ddr add i use, 0x82104000), so as to the destination address filled in the LSU reg1 when you wanna send a swrite packet. So how does dsp deal with the extra 3 address bit, where do they go?

Thanks!

David Yang

  • 0
    TI__Mastermind 23525 points

    If you do a nwrite, you supply a 32b address to the LSU reg1 and the byte_count in reg3 , the LSU then creates the packet's address and wdptr/wrsize appropriately.  If you use swrite, the addresses have to be 8B aligned, so the address in reg1 has to have the 3lsbs = 0.  There is no wdptr/wrsize with swrite.

    Regards,

    Travis