US 11,029,750 B2Granted

Apparatus for universal serial bus 2.0 (USB2) combined high speed squelch and disconnect detection

AssigneeIntel Corporation

InventorsAmit Kumar Srivastava, Chenchu Punnarao Bandi

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Abstract

Apparatus for managing high speed Universal Serial Bus 2.0 (USB2) communications is presented. The apparatus may include a combination differential difference detector to receive first and second input signals, the combination differential difference detector to, in a first mode: sense a first voltage difference between the first and second input signals and output a squelch signal when the first voltage difference is less than or equal to a pre-defined value. The combination differential difference detector is to, in a second mode, sense a second voltage difference between the first and second input signals and output a disconnect signal when the second voltage difference is greater than or equal to a pre-defined value. Related methods may also be disclosed.

Claims25

Dependent claims

An apparatus for managing high speed Universal Serial Bus 2.0 (USB2) communications, comprising:

a combination differential difference detector to receive first and second input signals detected on a USB2 bus, the combination differential difference detector to, in a receive mode:
sense a first voltage difference between the first and second input signals and output a squelch state signal when the first voltage difference is less than or equal to a first pre-defined value, the first voltage difference denoting either a squelch state or an un-squelch state;
and to, in a transmit mode:
sense a second voltage difference between the first and second input signals and output a disconnect state signal when the second voltage difference is greater than or equal to a second pre-defined value, the second voltage difference denoting either a connect state or a disconnect state, and the first and second pre-defined values being different pre-defined values;
wrapper logic coupled to the combination differential difference detector, the wrapper logic to initiate common mode (CM) adjustment training to enable the combination differential difference detector to be used for either the receive mode or the transmit mode, and to enable the combination differential difference detector to operate in either the receive mode or the transmit mode;
and
a bias voltage and bias current generator, coupled to each of the combination differential difference detector and the wrapper logic, to provide a first reference current and first reference voltages to the combination differential difference detector in the receive mode, and to provide a second reference current and second reference voltages to the combination differential difference detector in the transmit mode, the first and second reference currents being different reference currents, and the first and second reference voltages being different reference voltages.

4 more elements

A method of managing high speed USB2 communications, comprising:

using a combination differential difference detector, receiving differential positive (VDP) and differential negative (VDM) voltage signals detected over a USB2 connection;
and
selecting the combination differential difference detector to operate in either a receive mode or a transmit mode,
wherein,
in the receive mode:
the combination differential difference detector senses a first voltage difference between the VDP and VDM signals and outputs a squelch state signal when the first voltage difference is less than or equal to a first pre-defined value, the first voltage difference indicating either a squelch state or a non-squelch state,
and in the transmit mode:
the combination differential difference detector senses a second voltage difference between the VDP and VDM signals and outputs a disconnect state signal when the second voltage difference is greater than or equal to a second pre-defined value, the second voltage difference indicating either a connect state or a disconnect state, and the first and second pre-defined values being different pre-defined values;
wherein the method further comprises
prior to selecting the combination differential difference detector to operate in either the receive mode or the transmit mode, initiating common mode (CM) adjustment training to enable the combination differential difference detector to be used for either the receive mode or the transmit mode, and
on selecting the combination differential difference detector to operate in either the receive mode or the transmit mode, providing a first reference current and first reference voltages to the combination differential difference detector in response to selecting the receive mode, and providing a second reference current and second reference voltages to the combination differential difference detector in response to selecting the transmit mode, the first and second reference currents being different reference currents, and the first and second reference voltages being different reference voltages.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/638,049Filed 29 Jun 2017
Published: US 2019/0004590 A13 Jan 2019
Granted: 8 Jun 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G06F 1/3287
Power saving characterised by the action undertaken: by switching off individual functional units in the computer system
G06F 1/3215
Monitoring of events, devices or parameters that trigger a change in power modality: monitoring of peripheral devices
G06F 1/3253
Power saving in peripheral device: power saving in bus
G06F 13/4022
Coupling between buses: using switching circuits, e.g. switching matrix, connection or expansion network

Family

US 2019/0004590 A1Pre-grant publication · published 3 Jan 2019
US 11,029,750 B2This patent

From the US filing history. Foreign family members aren’t listed.

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