Abstract:
System, methods and apparatus are described that support multimode operation of a data communication interface. A method includes receiving a first code word transmitted while a physical interface of the device is configured to operate in a low-power mode of operation, reconfiguring the physical interface in response to the first code word such that it operates in a high-speed mode, transmitting data while the physical interface operates in the high-speed mode of operation, receiving a second code word transmitted while the physical interface operated in the high-speed mode of operation, and reconfiguring the physical interface in response to the second code word, such that it operates in the low-power mode of operation. The first code word, the second code word, and the data may be transmitted in signals bound by a common voltage range. In one example, the voltage range is less than 600 millivolts.
Abstract:
System, methods and apparatus are described that include a serial bus, including a serial bus used for Inter-Integrated Circuit (I2C) and/or camera control interface (CCI) operations. The bus has a first line and a second line, a first set of devices coupled to the bus and a second set of devices coupled to the bus. A method of operating the bus includes configuring the first set of devices to use the first line for data transmissions and use the second line for a first clock signal in a first mode of operation, and configuring the second set of devices to use both the first line and the second line for data transmissions while embedding a second clock signal within symbol transitions of the data transmissions in a second mode of operation.
Abstract:
Systems, methods and apparatus are described that facilitate transmission of data, particularly between two devices within an electronic apparatus. Two Integrated Circuit (IC) devices may be collocated in an electronic apparatus and communicatively coupled through a 3-wire, 3-phase interface. A data transfer method operational on a first of the two or more devices includes determining presence of a misalignment of the 3-wire communication link involving two or more wires, and inverting a first bit of a 3-bit symbol encoded in a transition of signaling state of the 3-wire communication link when the misalignment of the 3-wire communication link is determined to affect phase relationships between two or more signals carried on the three wires, such that inverting the first bit corrects the phase relationships between the two or more signals. A version of the 3-phase signal may be communicated in a different phase state through each of three wires.
Abstract:
System, methods and apparatus are described that facilitate transmission of data, particularly between two devices within an electronic apparatus. Each device can contend for control of a communications link by driving a data signal to a first voltage level. If the data signal or a clock signal changes before an arbitration time period has elapsed, one or more devices yield control of the communications link to another contender. The arbitration time period for each contender is different and indicates a priority of the message to be transmitted. A shorter arbitration time period indicates higher priority. Arbitration may commence after clock and data signals of the communications link remain in an idle or other predefined state for a minimum idle time. The minimum idle time may be different for different nodes and may be shorter for high priority messages or nodes.
Abstract:
System, methods and apparatus are described that facilitate transmission of data, particularly between two devices within an electronic apparatus. Information is transmitted in N-phase polarity encoded symbols. Drivers may be adapted or configured to align state transitions on two or more connectors in order to minimize a transition period between consecutive symbols. The drivers may include circuits that advance or delay certain transitions. The drivers may include pre-emphasis circuits that operate to drive the state of a connector for a portion of the transition period, even when the connector is transitioned to an undriven state.
Abstract:
System, methods and apparatus are described that facilitate transmission of data, particularly between two devices within an electronic apparatus. Information is transmitted in N-phase polarity encoded symbols. Drivers may be adapted or configured to align state transitions on two or more connectors in order to minimize a transition period between consecutive symbols. The drivers may include circuits that advance or delay certain transitions. The drivers may include pre-emphasis circuits that operate to drive the state of a connector for a portion of the transition period, even when the connector is transitioned to an undriven state.
Abstract:
System, methods and apparatus are described that facilitate transmission of data, particularly between two devices within an electronic apparatus. Information is transmitted in N-phase polarity encoded symbols. Data is encoded in multi-bit symbols, and the multi-bit symbols are transmitted on a plurality of connectors. The multi-bit symbols may be transmitted by mapping the symbols to a sequence of states of the plurality of connectors, and driving the connectors in accordance with the sequence of states. The timing of the sequence of states is determinable at a receiver at each transition between sequential states. The state of each connector may be defined by polarity and direction of rotation of a multi-phase signal transmitted on the each connector.
Abstract:
System, methods and apparatus are described that facilitate transmission of data over a multi-wire data communications link, particularly between two devices within an electronic apparatus. A sequence of data bits is converted into M transition numbers, which are then converted into a sequence of symbols. The sequence of symbols is transmitted received over N wires. A clock signal may be effectively embedded in the transmission of the sequence of symbols. Each of the sequence of symbols may be selected based on a corresponding one of the M transition numbers and a value of a preceding one of the sequence of symbols.
Abstract:
A high speed serial interface is provided. In one aspect, the high speed serial interface uses three phase modulation for jointly encoding data and clock information. Accordingly, the need for de-skewing circuitry at the receiving end of the interface is eliminated, resulting in reduced link start-up time and improved link efficiency and power consumption. In one embodiment, the high speed serial interface uses fewer signal conductors than conventional systems having separate conductors for data and clock information. In another embodiment, the serial interface allows for data to be transmitted at any speed without the receiving end having prior knowledge of the transmission data rate. In another aspect, the high speed serial interface uses polarity encoded three phase modulation for jointly encoding data and clock information. This further increases the link capacity of the serial interface by allowing for more than one bit to be transmitted in any single baud interval.
Abstract:
A termination network for a receiver device is provided to support both D-PHY signaling and N-factorial signaling. The first end of each of a plurality dynamically configurable switches is coupled to a common node. A first end of each of a plurality of resistances is coupled to a second end of a corresponding switch. A plurality of terminals receive differential signals and each terminal is coupled to a corresponding second end of a resistance. Each of a plurality differential receivers is coupled between two terminals of the termination network, wherein a first differential receiver and a second differential receiver are coupled to the same two terminals, the first differential receiver is used when the differential signals use a first type of differential signal encoding, the second differential receiver is used when the differential signals use a second type of differential signal encoding.