USB Enumerations: Device Descriptor Request

[alexz]

USB Enumeration

I am trying to develop a USB device using the USB9603 controller and PIC.
I get the Device Descriptor Request from the host, transmit the first 8 bytes of the device descriptor, receive ACK, transmit the 2nd 8 bytes of the Device Descriptor ,
finally I got 3 ACKs, and transmit the last 2 bytes of the descriptor and get a NAK.

The question is: Is that the right sequence? When sould I get the Set Address request? Why do I get NAKs every time after transmitting the last 2 bytes?

 

[brmadhukar]

Re: USB Enumeration

Have checked your timing? Or have you made a timing analysis

 

[vale]

USB Enumeration

see my post on

 

[alexz]

Re: USB Enumeration

Have checked your timing? Or have you made a timing analysis

what should I check exactly?
I know I have got about 10ms to send the data after receiving the request.
Is that what you mean?
Also it is difficult to debug when time is limited. And the result can change from time to time. But I dont see another way