Low power embedded USB2 (eUSB2) repeater

A method of operating an embedded universal serial bus (eUSB) repeater, comprising:

• activating a universal serial bus (USB) receiver and an eUSB transmitter, wherein the eUSB transmitter couples to the USB receiver so as to receive downstream packets from the USB receiver;
• receiving, by the USB receiver, a token packet indicative of transmission of a first downstream packet;
• and
• transitioning a USB transmitter and an eUSB receiver from a standby state to an active state responsive to receiving the token packet, wherein the USB transmitter couples to the eUSB receiver so as to receive upstream packets from the eUSB receiver.

A method of operating a repeater having a first input/output (I/O), a second I/O, a first transmitter, a second transmitter, a first receiver, and a second receiver, the method comprising:

• holding the first receiver and the first transmitter in active states while holding second receiver and the second transmitter in standby states;
• receiving by the first receiver a token packet indicative of transmission of a downstream packet;
• transitioning the second receiver and the second transmitter from the standby states to the active states responsive to receiving the token packet;
• receiving by the first receiver the downstream packet or receiving by the second receiver an upstream packet within a first timeout period after receiving the token packet;
• and
• transmitting the downstream packet by the first transmitter or transmitting the upstream packet by the second transmitter.

A method of operating an embedded USB2 (eUSB2) repeater, comprising:

• holding a USB 2.0 receiver and an eUSB2 transmitter in active states while holding an eUSB2 receiver and a USB 2.0 transmitter in standby states;
• receiving by the USB 2.0 receiver a token packet indicative of transmission of a first downstream packet;
• transitioning the USB 2.0 transmitter and the eUSB2 receiver from the standby states to the active states responsive to the token packet;
• receiving by the USB 2.0 receiver a second downstream packet or receiving by the eUSB2 receiver an upstream packet within a first timeout period after receiving the token packet;
• transmitting the second downstream packet by the eUSB2 transmitter or transmitting the upstream packet by the USB 2.0 transmitter;
• and transitioning the eUSB2 receiver and the USB 2.0 transmitter from the active states to the standby states if no packet is received within the first timeout period.