4 Replies Latest reply on Jul 17, 2012 1:26 AM by rama.sai.krishna.vakkantula

    BUK IN DP burst not according to U3 Spec?

    che-wen.chang

      I found the FX3 will sometimes send 2 consecutive DPs, then wait for Host ACK. but according to USB3.0 spec 8.12.1.2 (BUK IN Transaction), device don't have to wait for Host ACK [BURST], so in my case Host will first send ACK with NumP=8, it means device is allowed to response with up to 8 consecutive DPs without waiting Host ACK. what is the reason of FX3 not following spec on this part? is it because the bandwidth of FX3 not enough? 

         

      please see my attached file for more detail.

         

      thanks.