7 Replies Latest reply on Mar 7, 2012 6:21 AM by anand.srinivasan.asokan

    what's the connotation of bit12:11 in wMaxPacketSize for a interrupt endpoint?

    yan.david

      Hi,everyone,

         

      in the enfpoint descriptor, wMaxPacketSize's bit 12:11 is the number of transaction in one microframe for isochrounous endpoint .

         

      so what's the connotation of bit12:11 in wMaxPacketSize for a interrupt endpoint? does it have the same meaning? 

         

      if so, when i set it to be 0x1c00---3 transactions in one microframe and 1024 maxpacketsize, the interrupt endpoint can't transfer anyword even i use the cyconsole.exe to test.

         

      if the wMaxPacketSize's bit 12:11 for interrupt endpoint doesn't has the same connotation as the isochronous endpoiunt, the binterval define the minimum interrupt period as 125us. so 68013's interrupt endpoint  can only transfer one packet  in one microframe. obviously this is not right.

         

      so i'm perplexed on the connotation of bit12:11 in wMaxPacketSize for a interrupt endpoint.

         

      should somebody tell me? thanks a lot!