What is the PID field byte for a PID code of '0010' in a USB packet structure?

[Liamt]

Hi i need help answering a question I am stuck on if anyones able to assist

if a PID code is ‘0010’ what should the PID field byte be?

Im really struggling on how to work it out

 

[jedishrfu]

Can you give a context here? What do you mean by PID code?

If its 0010 then that requires only 4 bits to store. Microcomputer memory is organized by bytes which are 8-bit entities.

 

[Liamt]

Can you give a context here? What do you mean by PID code?

If its 0010 then that requires only 4 bits to store. Microcomputer memory is organized by bytes which are 8-bit entities.

Basically the initial question is , The diagram below shows the structure of a USB token packet. Identify the function of each field.
then the next question is the one above 'if a pid code is 0010 ,what should the PID field byte be?

 

[jedishrfu]

Here's some technical details on the USB packet structure.

http://www.beyondlogic.org/usbnutshell/usb3.shtml

http://www.ftdichip.com/Support/Documents/TechnicalNotes/TN_116_USB Data Structure.pdf

For the PID (see page 6 / page 7 in the PDF file)

They state that is is 4 bits long and that it is followed by its complement so in your case what would you see in the first byte of the packet.

 

[Liamt]

Here's some technical details on the USB packet structure.

http://www.beyondlogic.org/usbnutshell/usb3.shtml

http://www.ftdichip.com/Support/Documents/TechnicalNotes/TN_116_USB Data Structure.pdf

For the PID (see page 6 / page 7 in the PDF file)

They state that is is 4 bits long and that it is followed by its complement so in your case what would you see in the first byte of the packet.

awesome thank you your a star much appreciated