Use of differential pair as single-ended data paths to transport low speed data
First Claim
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1. A method for transmitting signals across a pair of wires, comprising:
- (a) transmitting differential signals across the pair of wires during a period of time when a device is in an active mode, the differential signals being transmitted across the pair of wires comprising high speed video signals, and the differential signals being transmitted across the pair of wires also comprising low speed serial clock (SCL) and serial data (SDA) signals embedded with the high speed video signals; and
(b) transmitting two single-ended signals across the same pair of wires during another period of time when the device is in a sleep or standby mode, neither of the two single-ended signals comprising the high speed video signals, one of the two single-ended signals being transmitted across one of the wires comprising the low speed serial clock (SCL) signal, and the other one of the two single-ended signals being transmitted across the other one of the wires comprising the low speed serial data (SDA) signal.
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Abstract
Provided herein are systems and methods for transmitting signals across a pair of wires. In accordance with specific embodiments, a differential signal is transmitted across the pair of wires during one period of time, and two single-ended signals are transmitted across the same pair of wires during another period of time. Low voltage differential signaling (LVDS) can be used to transmit the differential signal across the pair of wires. In contrast, non-differential signaling can be used to transfer the two singled-ended signals across the same pair of wires.
136 Citations
27 Claims
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1. A method for transmitting signals across a pair of wires, comprising:
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(a) transmitting differential signals across the pair of wires during a period of time when a device is in an active mode, the differential signals being transmitted across the pair of wires comprising high speed video signals, and the differential signals being transmitted across the pair of wires also comprising low speed serial clock (SCL) and serial data (SDA) signals embedded with the high speed video signals; and (b) transmitting two single-ended signals across the same pair of wires during another period of time when the device is in a sleep or standby mode, neither of the two single-ended signals comprising the high speed video signals, one of the two single-ended signals being transmitted across one of the wires comprising the low speed serial clock (SCL) signal, and the other one of the two single-ended signals being transmitted across the other one of the wires comprising the low speed serial data (SDA) signal. - View Dependent Claims (2, 3, 4, 5, 18, 21, 24)
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6. A method for reducing power consumption in a battery powered mobile device that has a first mode and a second mode, the method comprising:
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(a) using low voltage differential signaling (LVDS) to transfer high speed video signals, and low speed serial clock (SCL) and serial data (SDA) signals embedded with the high speed video signals, across a pair of wires, when the device is in the first mode; and (b) using non-differential signaling to transfer the low speed serial clock (SCL) signal and the low speed serial data (SDA) signals, but not the high speed video signals, across the same pair of wires, when the device is in the second mode; wherein when the device is in the second mode, the low speed serial clock (SCL) signal is transferred using non-differential signaling across one of the pair of wires, and the low speed serial data (SDA) signal is transferred using non-differential signaling across the other one of the pair of wires. - View Dependent Claims (7, 8, 9, 10, 25, 26)
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11. A system, comprising:
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a transmitter configured to transmit high speed video signals and low speed serial clock (SCL) and serial data (SDA) signals, the transmitter including a pair of outputs; and a receiver including a pair of inputs; wherein the pair of outputs of the transmitter are configured to be connected, by a pair of wires, to the pair of inputs of the receiver; wherein the transmitter, when in a first mode, outputs differential signals at the two outputs to transmit across the two wires to the two inputs of the receiver, the differential signals including the high speed video signals and the low speed serial clock (SCL) and serial data (SDA) signals embedded with the high speed video signals; and wherein the transmitter, when in a second mode, outputs two single-ended signals, one at each of the two outputs, to transmit across the same two wires to the two inputs of the receiver, one of the two single-ended signals including the low speed serial clock (SCL) signal, the other one of the two single-ended signals including the low speed serial data (SDA) signal, and neither of the two single-ended signals including the high speed video signals. - View Dependent Claims (12, 13, 14, 15, 16, 19, 22)
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17. A system for transmitting signals across a pair of wires, comprising:
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means for transmitting differential signals across the pair of wires during a period of time when the system is in an active mode, the differential signals comprising high speed video signals and low speed serial clock (SCL) and serial data (SDA) signals embedded with the high speed video signals; and means for transmitting two single-ended signals across the same pair of wires during another period of time when the system is in a sleep or standby mode, neither of the two single-ended signals comprising the high speed video signals, one of the two single-ended signals comprising the low speed serial clock (SCL) signal, and the other one of the two single-ended signals comprising the low speed serial data (SDA) signal. - View Dependent Claims (20, 23, 27)
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Specification