1 Reply Latest reply on Oct 13, 2013 11:17 AM by rama.sai.krishna.vakkantula

    Forcing a Short Packet using GPIF Master

    ken.schutz

      I am using the GPIF Master example from http://www.cypress.com/?rID=84236.  I have it working nicely in USB2 for normal MaxPacket Length packets.  If I want the DMA/State Machine to send a short IN packet what should I do?  I know before hand when the FPGA connected to the GPIF bus will just send a single word to the Cypress and at this point I need to make sure the USB Controller just takes this single word and sends it back as an 4 Byte Short IN Packet going to the PC. 

         

       

         

      Or could I use a Cypress input from the FPGA to "force" the Cypress to send a short packet with the data it has its buffer?

         

       

         

      Ken