USB protocol(either version 1.1 or 2.0)

HI all,

Can any one suggest or point me IEEE standard USB protocol pdf & any document easy to understand the functionality of USB protocol.
I searched in google but i didn’t find correct document.
If possible please share the USB VIP(SV or UVM code) also.

Thanks in advance

In reply to VK_18:

The first 10 hits seem good to me.

In reply to dave_59:

For AHB, APB & AXI we have proper IEEE standard document, like i am asking for USB.

In reply to VK_18:

IEEE is not involved in any of these standards.

AHB, APB & AXI specs are released by ARM Holdings.

USB specs are released by the USB Implementors Forum.

I fail to see how you could fail to search and not find this.

In reply to dave_59:

Thank u Dave_59

I got it.