PORTS Forum

Ports and Interfaces => USB => Topic started by: Chris on May 06, 2011, 10:37:07 pm

Title: what is the sense of link control in USB3.0 or PIC express
Post by: Chris on May 06, 2011, 10:37:07 pm

hello;
In many high speed serial bus protocal,link control is important.Befor and after a packet transaction in protocal layer,there always some link packets trans.what's the real purpose of link control? IF there's no link control what will be happened?
Regards!
Chris Bean.

Title: Re: what is the sense of link control in USB3.0 or PIC express
Post by: Jan Axelson on May 09, 2011, 08:51:03 am

In USB 3.0, link commands acknowledge received header packets, recover from errors, implement flow control, and manage power. Link-layer protocols define how the link manages buffers, frames packets, and detects received packets. The link layer handles training and synchronizing to establish connectivity between a device and its upstream link partner.

For details, see the USB 3.0 spec.

Jan