Abstract:
PROBLEM TO BE SOLVED: To provide a serial trigger circuit which does not need an expensive precision high-power circuit, design accuracy, high costs, and complicated software. SOLUTION: The position lock trigger apparatus employs oscilloscope circuitry and accompanying control software to provide to a user a capability to trigger an oscilloscope on a selected bit position in a received serial bit stream having a fixed pattern length, using either a synchronized, recovered, or external clock source. The selected trigger position can be moved forward or backward along the serial bit stream by one or more serial bit positions at a time in order to examine the entirety of the fixed pattern length serial bit stream, with or without regard to actual bit sequences occurring in the serial stream. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To instantaneously trigger on a frequency deviation dF/dT of an SSC signal.SOLUTION: A signal received at an input terminal 210 of a test and measurement instrument 200 is low-pass filtered and transmitted to dF/dT trigger circuitry 220. The dF/dT trigger circuitry 220 includes trigger circuitry and a PLL circuit. The trigger circuitry is connected to an output terminal of an adjustable low-pass filter in the PLL circuit, and receives a proportional path output signal of the PLL circuit. Thereby, when a frequency deviation in the filtered SSC signal exceeds or crosses one or more thresholds, the trigger circuitry produces a trigger event.
Abstract:
PROBLEM TO BE SOLVED: To provide fine delays realizing gate delays shorter than one gate delay by coupling a plurality of multiplexers.SOLUTION: A ring oscillator timer circuit 10 includes a plurality of electrical components 16, 24, 32, 40, and 48 configured as cascaded combination of delay stages connected in a closed loop chain. The timer circuit 10 begins oscillation after a programmable number of unit gate delays after receiving a start signal. In some examples, fine delays smaller than the unit gate delays can be set. In further examples, the timer circuit 10 may include a counter having an input terminal electrically coupled to an output terminal of a reset electrical component.
Abstract:
PROBLEM TO BE SOLVED: To improve the performance and flexibility of serial data analysis. SOLUTION: In a transmitter section 10, a demultiplexer 12 inputs serial data and outputs n×N data lanes, an encoder 14 inputs these data lanes and generates m×N encoded data lanes, a circuit 16 inserts additional data into these encoded data lanes and generates m×N stuffed data lanes, and a multiplexer 18 inputs these stuffed data lanes and outputs N serial data lanes at a desired data rate. A receiver section 20 inputs N serial data lanes and outputs a trigger event for serial data. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To substantially eliminate the dead time related to futile searches by avoiding such futile searches for non-existent eye violations, while using an eye diagram for specifying the quality of a serial/digital signal. SOLUTION: When detecting a violation due to a digital signal within a unit time interval while acquiring the digital signal, a mask 12 is defined within the unit time interval. When the digital signal crosses a master during a period of the unit time interval, a violation signal is generated. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide triggering on detecting specific analog anomalies and/or digital data contained in a specific identification area of a serial data stream. SOLUTION: A start word recognizer 16 detects a start pattern in the serial data stream to generate an enable signal. Then a stop word recognizer 18 detects a stop pattern in the serial data stream to generate a disable signal. An arm circuit 24 generates an identification signal which indicates a period between the enable signal and the disable signal. A trigger circuit 30 generates a trigger signal if detecting an analog anomaly and/or specific digital data generated during a period of the identification signal. COPYRIGHT: (C)2007,JPO&INPIT