regarding start of frame packet in USB

[arun397]

hi,
i have earlier posted few posts regarding my project USB device core on a FPGA ......
i would like to know whether a SOF packet is required to be added(written) in the code for a USB device ...............
thank you.........

 

[tkbits]

Devices do not generate SOF. Only Hosts (root controllers and hubs) generate SOF. If you build a full speed (12 Mbps) device, the Host will send SOF to your device.

If you are building a Host (for example, for communicating with a USB device such as memory stick): low speed (1.5 Mbps) does not generate SOF, full speed (12 Mbps) must generate SOF.

 

[arun397]

Devices do not generate SOF. Only Hosts (root controllers and hubs) generate SOF. If you build a full speed (12 Mbps) device, the Host will send SOF to your device.

If you are building a Host (for example, for communicating with a USB device such as memory stick): low speed (1.5 Mbps) does not generate SOF, full speed (12 Mbps) must generate SOF.

so u say i need to include it in my code to receive SOF from the host.........
i did not get u exactly can u be more clear please..........