摘要:
A system and method of terminating signals are described. In one embodiment, the termination system of the present invention comprises a receiver for receiving a signal from a transmission line, a termination node, a resistive element disposed between the receiver and the termination node, and a termination voltage controller for changing the voltage level of the termination node, in response to the detected signal voltage level. In another embodiment, the present invention includes a method of adaptively terminating a signal. The method of this embodiment comprises detecting the voltage level of a signal, selecting the termination voltage level of a termination node in response to the detected signal voltage level, and terminating the signal, through a resistive element, at the selected termination voltage level.
摘要:
Methods and apparatuses for calibrating out static timing offsets across multiple outputs of a transmitting device are provided. In accordance with at least one embodiment, a signal is selected as the master reference signal, and a closed-loop feedback system is provided to align one or more outputs of the transmitting device to a master reference signal. The master reference signal can be one of the signals being output by the transmitting device, an internal signal that is representative of the desired placement of the edges, or an external signal received by the transmitting device. The signal from the transmitting device is received by a receiver, and a calibration control block is used to generate a control signal to adjust the operation of the transmitting device.
摘要:
An input signal is transmitted from a first device to a second device. At the second device the input signal method is received, and an output signal is generated in response to the input signal. The output signal is sensed, and the input signal is dynamically terminated in response to sensing the output data. In some embodiments, the receiving, generating and dynamically terminating occur within a single integrated circuit. In some embodiments, the method includes detecting a signal voltage level of the input signal and causing a termination voltage level to change from a first voltage level to a second voltage level in response to the signal voltage level.
摘要:
A first timing reference signal and a second timing reference signal are sent to a memory device. The second timing reference signal has approximately a quadrature phase relationship with respect to the first timing reference signal. A plurality of serial data patterns are received from the memory device. The transitions of the first timing reference and the second timing reference determining when transitions occur between the bits of the plurality of data patterns. Timing indicators associated with when received transitions occur between the bits of the plurality of data patterns are received from the memory device. The timing indicators are each measured using a single sampler. Based on the timing indicators, a first duty cycle adjustment for the first timing reference signal, a second duty cycle adjustment for the second timing reference signal, and a quadrature phase adjustment are determined and applied.
摘要:
A method and apparatus for selectably providing single-ended and differential signaling with controllable impedance and transition time is provided. According to the method and apparatus, a differential signal can be transmitted over two wires or two single-ended signals can be transmitted over the two wires. According to the method and apparatus, termination may be selected among a single-reference termination, a center termination, or a high-impedance termination. Regardless of the type of termination selected, a capability for dynamic control of the termination impedance is provided. Moreover, an ability to change impedances of termination elements to maintain a desired termination impedance for both single-reference termination and center termination modes by shifting bits is provided. Also, a capability for dynamic control of transition times of signals is provided.
摘要:
The subject invention provides an advertising display assembly (10) including two layers of stock material (12, 28) defining a plurality of outer peripheral edges (42, 44, 46). A release liner (24) is sandwiched therebetween. A plurality of score lines (62) define an integral coupon card (20) within the assembly (10) and an outer strip of material (22) between the integral card (20) and the outer peripheral edges (42, 44, 46). A plurality of mini-coupons (58) are detachably cut into the integral card (20) through the second layer of stock material (28). The assembly (10) is characterized by a hinge (74) extending across the strip of material (22) and defining an upper portion (76) and a lower portion (78) in the strip of material (22). The lower portion (78) of the strip of material (22) rotates relative to the upper portion (76) and the integral card (20) for supporting the assembly (10) on a surface (80) in an upright position for display.
摘要:
A circuit, apparatus and method provides a lock state value representing an amount of time a phase alignment circuit (“PAC”), such as a PLL or DLL, is tracking or locked to an incoming reference signal for a predetermined period of time. In an embodiment of the present invention, a lock state detection circuit is coupled to a lock loop circuit and includes a phase detection circuit and a counter circuit. The phase detection circuit includes a phase detector and delay elements that are coupled to the PAC phase detector. The phase detector outputs a lock state sample value of the PAC. In an embodiment of the present invention, the PAC is locked when a stream of alternating lock state sample values, logical 1's and 0's, are output from the phase detector. The counter circuit includes a flip-flop, an XOR gate and counter for obtaining a lock state value for a predetermined period of time.
摘要:
A method and apparatus for selectably providing single-ended and differential signaling with controllable impedance and transition time is provided. According to the method and apparatus, a differential signal can be transmitted over two wires or two single-ended signals can be transmitted over the two wires. According to the method and apparatus, termination may be selected among a single-reference termination, a center termination, or a high-impedance termination. Regardless of the type of termination selected, a capability for dynamic control of the termination impedance is provided. Moreover, an ability to change impedances of termination elements to maintain a desired termination impedance for both single-reference termination and center termination modes by shifting bits is provided. Also, a capability for dynamic control of transition times of signals is provided.
摘要:
A circuit and method is shown for digital control of delay lines in a delay locked loop (DLL) system. A pair of multiplexors (MUXes) is used to select output taps from a pair of complementary delay lines that delay a reference clock signal in order to lock onto a received clock signal. An output tap from one delay line is used to produce a rising edge in an output clock signal while a corresponding tap in the complementary delay line is used to produce a falling edge in the output signal in order to correct for distortion. The MUXes are controlled based on a phase difference detected between the received clock signal and a feedback clock corresponding to the output clock signal. Another aspect of the present invention provides for generation of a quadrature clock by interpolating between the rising and falling edges selected for the output clock signal. Still another aspect of the present invention provides for selectively disabling unused elements of the delay lines to reduce power consumption.
摘要:
A communication channel includes a first component having a transmitter coupled to a normal signal source, and a second component having a receiver coupled to a normal signal destination. A communication link couples the first and second components. Calibration logic provides for setting an operation value for a parameter of the communication channel, such as by executing an exhaustive calibration sequence at initialization of the link. A tracking circuit, including a monitoring function, tracks drift in the parameter by monitoring a feedback signal that has a characteristic that correlates with drift in the communication channel, and updates, or indicates the need for updating of, the operation value of the parameter in response to the monitoring function.