Abstract:
The present invention relates to the reduction of timing uncertainty in high speed communications channel or interface and to a receiver and method using the same. The receiver according to the invention uses an over sampled data stream to detect bits, analyses the sampled stream of bits, determines valid samples and then expand them into a minimal eye required for accurate and reliable data reading. The present invention includes capability to track an eye across sample blocks, correcting for jitter.
Abstract:
The present invention relates to a pull-up structure with variable strength, which combines a resistor network with N type MOS transistors. According to the invention, the pull up structure comprises a n-channel type MOSFET (51) with a resistor (52) in parallel. Alternatively, a resistor (54) is connected between the terminal of the pull up and a voltage supply. This allows the pull up to be varied to compensate for process and temperature variations around a predefined pull-up strength, and at the same time provides low parasitic capacitance and a good dynamic response of the pull-up structure.
Abstract:
The present invention relates to a pull-up structure with variable strength, which combines a resistor network with N type MOS transistors. According to the invention, the pull up structure comprises a n-channel type MOSFET with a resistor in parallel. Alternatively, a resistor is connected between the terminal of the pull up and a voltage supply. This allows the pull up to be varied to compensate for process and temperature variations around a predefined pull-up strength, and at the same time provides low parasitic capacitance and a good dynamic response of the pull-up structure.
Abstract:
A reference voltage generator employs a ring oscillator having a plurality of logic stages and a phase/frequency detector, for generating a first feedback signal on the basis of a phase/frequency difference between the phase/frequency of a reference clock and the phase/frequency of the ring oscillator; and to generate a second feedback signal on the basis of a voltage swing of the oscillator circuit; both feedback signals to be applied to said plurality of logic stages of the ring oscillator; whereby a constant delay is created through each logic stage of the logic device. In another aspects of the invention, a method of generating a reference voltage for a logic device by using the reference voltage generator as above and a logic device with a controlled propagation delay of each of the logic stages are provided.
Abstract:
The invention relates to a communications receiver with reduced latency and method that offsets the receiver framing alignment to minimize the decode latency for return data. The receiver comprises transceiver cells for deserialising data received in frames from a host computer into a parallel output data word of width equal to the number of bits in the frame; and a memory interface controller for decoding the parallel frame data from the transceiver cells and generating control signals and data signals to a memory device. The phase of the deserialised output data is adjusted to offset the parallel output data word to the frame control clock, so that the parallel output data word is aligned to the frame control clock such that the output data becomes valid when the command field has been deserialised. This provides improved clocking alignment for any downstream components operating on the data contained within the frame structure.
Abstract:
Bidirectional differential point to point simultaneous high speed signalling is provided between integrated circuits with highly effective echo canceling. Each integrated circuit comprises a transmitter for transmitting a first signal to another integrated circuit and a receiver for receiving a second signal from the other integrated circuit. The transmitter has an output buffer; a receiver has a receiver buffer and is co-located on the same integrated circuit; and a signal processing circuit is coupled between the input of the transmitter buffer and the output of the receiver buffer. To increase the quality of receiving the second signal, a third signal adjusted in phase and amplitude is coupled at the output of the receive buffer, so that the echoing of the first signal is canceled. Preferably, the rise time of the third signal is also adjusted.
Abstract:
A reference voltage generator employs a ring oscillator having a plurality of logic stages and a phase/frequency detector, for generating a first feedback signal on the basis of a phase/frequency difference between the phase/frequency of a reference clock and the phase/frequency of the ring oscillator; and to generate a second feedback signal on the basis of a voltage swing of the oscillator circuit; both feedback signals to be applied to said plurality of logic stages of the ring oscillator; whereby a constant delay is created through each logic stage of the logic device. In another aspects of the invention, a method of generating a reference voltage for a logic device by using the reference voltage generator as above and a logic device with a controlled propagation delay of each of the logic stages are provided.
Abstract:
A receiver containing a clock and data recovery circuit operating at a quarter-rate clock frequency is provided for high-speed signalling between integrated circuits. Each integrated circuit comprises a receiver for receiving a first signal from the other integrated circuit. The receiver has a clock and data recovery phase locked loop.
Abstract:
The present invention relates to the reduction of artifacts introduced by sending data at a higher rate than the bandwidth of the communication channel, such as the voltage and current offsets introduced in the data at the receiver as a function of the preceding data.
Abstract:
The present invention relates to the reduction of timing uncertainty in high speed communications channel or interface and to a receiver and method using the same. The receiver according to the invention comprises a plurality of samplers for latching data. The invention provides improvements to the Bit Error rate versus channel and inherent register noise, as a result of employment of the characteristic of phase noise within the receiving registers to measure the characteristics of the channel and to compensate for variations in the channel by altering the timing characteristics of the signal.