Signal transmitter based on universal serial bus protocol and handshake method thereof
AssigneeSigmastar Technology Ltd.
InventorsSixin HONG, Zhenyang PANG, Tianli QU
Life of this patent
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Abstract
A signal transmitter includes a driving circuit, a control circuit and a clamping circuit. The driving circuit adjusts a level of a signal pad according to a data signal during a handshake phase to perform a speed negotiation with an electronic device. The control circuit generates a clamping signal according to an operation mode signal and a transmit valid signal in a Universal Serial Bus (USB) protocol. The clamping circuit is activated according to the clamping signal during the handshake phase to limit the level of the signal pad.
Claims10
A signal transmitter, comprising:
- a driving circuit, adjusting a level of a signal pad according to a data signal during a handshake phase to perform a speed negotiation with an electronic device;
- a control circuit, generating a clamping signal according to an operation mode signal and a transmit valid signal in a Universal Serial Bus (USB) protocol;
- and
- a clamping circuit, activated according to the clamping signal during the handshake phase to limit the level of the signal pad.
A handshake method, performed by a signal transmitter, the handshake method comprising:
- adjusting a level of a signal pad according to a data signal during a handshake phase to perform a speed negotiation with an electronic device;
- generating a clamping signal according to an operation mode signal and a transmit valid signal in a Universal Serial Bus (USB) protocol;
- and
- activating a clamping circuit in the signal transmitter according to the clamping signal during the handshake phase to limit the level of the signal pad by the clamping circuit.
Dependencies are inferred from the claim text.