Arrangement for transmitting check characters to connector eleme

Details Arrangement for transmitting check characters to connector eleme Arrangement for transmitting check characters to connector eleme

1983-09-21

1986-04-01

Atkinson, Charles E.

Excavating

371 20, G01R 3128

Patent

active

045802645

ABSTRACT:
When testing a unit under test, for example, a card module, check characters must be transmitted to the unit under test from the tester via connector elements. One selection device per connector element is provided in order to be able to transmit the correct check character over the correct connector element. Each selection device contains addresses of the check characters which are to be transmitted over the allocated connector element in an address register. During the test event, the assistance of a comparison device is employed in order to determine whether the addresses contained in the address register coincide with the addresses of check characters which are supplied by an input bus. Given equality, the allocated test signal is transmitted to the connector element. When a plurlity of check characters are allocated to one address, one of the check characters can be selected and transmitted to the connector element with the assistance of a multiplexer given equality of the addresses. Since respectively those check characters which are to be transmitted over the connector element are selected by a changeable address stored by the associated selection device, the check characters allocated to one address can be selected by a plurality of selection devices. The number of machine words comprised of address and allocated check character required per test operation is therefore considerably reduced.

REFERENCES:
patent: 3737637 (1973-06-01), Frankeny et al.
patent: 4066882 (1978-01-01), Esposito
patent: 4287594 (1981-09-01), Shirasaka
patent: 4293950 (1981-10-01), Shimizu et al.
patent: 4439858 (1984-03-01), Petersen
patent: 4493079 (1985-01-01), Hughes, Jr.

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