Test circuit and test method for communication system
AssigneeKawasaki Microelectronics, Inc.
InventorShoichiro Kashiwakura
Life of this patent
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Abstract
A communication system for transmitting and receiving data at high speed can be self-tested at actual operating speed with low cost, and without increasing the chip area. A test signal generation unit generates test parallel data. A transmitter for test purpose converts the parallel data into serial data. A selector selectively supplies the serial data output from the transmitter to a receiver during a test operation. The receiver converts the serial data into parallel data. After that, a detector detects an error in the parallel data output from the receiver. In this case, only the transmitter is disposed in correspondence with receivers. Serial data output from the transmitters is supplied to the receivers through the selector.
Claims20
A test circuit for a communication system that comprises a plurality of receivers that receive serial data and then converts the serial data into parallel data, the circuit comprising:
- a generator that generates test serial data;
- and
- selectors that selectively supply the serial data or the test serial data generated by the generator to a corresponding receiver, wherein
- the test serial data generated from the generator is supplied to the plurality of receivers through the selectors.
A test circuit for a communication system that comprises a plurality of transmitters that convert parallel data into serial data and then transmit the converted data, the circuit comprising:
- a first selector that selectively supplies parallel data or test parallel data to a corresponding transmitter;
- a second selector that selectively outputs one of the serial data outputs of the plurality of transmitters;
- and
- a detector that detects an error in the serial data output from the second selector.
A test method for a communication system that comprises a plurality of receivers that receive serial data and then convert the serial data into parallel data, the method comprising:
- generating test serial data;
- and
- supplying the test serial data to the receivers.
A test method for a communication system that comprises a plurality of transmitters that convert parallel data into serial data, and then transmit the converted data, the method comprising:
- selectively supplying parallel data or test parallel data to a corresponding transmitter;
- selectively outputting one of the serial data outputs of the transmitters;
- and
- detecting an error in the selectively output serial data.
Dependencies are inferred from the claim text.