Back to results
US 5,075,575 AGranted
Externally synchronized programmable device
AssigneeFuji Photo Film Co., Ltd.
InventorsMakoto Shizukuishi, Kazuo Kawamura
Life of this patent
Estimating the term…
Abstract
In a programmable device wherein a circuit can be designed by programming the device according to a certain design specification, and the circuit is phase or frequency synchronized to an externally supplied signal. The device further allows for redesign by reprogramming the device.
Claims10
An external synchronization programmable device comprising:
- a programmable logic portion having an AND matrix and an OR matrix for implementing a desired logic circuit by programming connections, said logic portion being programmed to generate an internal signal having a phase and a leading edge;
- means for supplying an external signal having a phase;
- and a phase comparison circuit for comparing the phase of said external signal with the phase of said internal signal, wherein said phase comparison circuit generates a signal expressing phase lagging and phase leading.
An external synchronization programmable device comprising:
- a programmable logic portion having an AND matrix and an OR matrix for implementing a desired logic circuit by programming connections, said AND matrix having input signal lines, said logic portion being programmed to generate an internal signal having a phase;
- means for supplying an external signal having a phase;
- and a phase comparison circuit for comparing the phase of said external signal with the phase of said internal signal, wherein said phase comparison circuit generates a signal representative of the phase difference between the two signals and supplies a signal expressing whether the phases of said external signal and said internal signal coincide with each other to feed the signal to a predetermined part of said input signal lines of said AND matrix.
An external synchronization programmable device connected to an external signal having a phase, comprising:
- an AND matrix;
- an OR matrix, wherein said AND matrix and said OR matrix can be programmed to form a logic circuit generating at least an internal signal having a phase;
- a fixed phase comparison circuit for comparing the phase of said internal signal and said external signal;
- a charge pump circuit for generating an output indicative of the difference between said phases of said internal signal and said external signal;
- a voltage-controlled oscillator circuit;
- an active filter responsive to said charge pump circuit and generating an output to control said voltage-controlled oscillator circuit;
- wherein, said voltage-controlled oscillator circuit generates a signal having a predetermined frequency corresponding to said output of said active filter to synchronize operation of said programmable logic circuit with said external signal.
4 more elements
An external synchronization programmable device comprising:
- a programmable logic portion having an AND matrix and an OR matrix for designing a desired logic circuit by programming connections, said OR matrix having at least a first and second output with a unique phase;
- and a phase comparison circuit for comparing the phase of said first output with the phase of said second output, wherein said phase comparison circuit generates a signal expressing phase lagging and phase leading.
Dependencies are inferred from the claim text.