Driver IC with automatic token direction self-sensing circuitry

Details Driver IC with automatic token direction self-sensing circuitry Driver IC with automatic token direction self-sensing circuitry

1995-12-28

1998-09-08

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347247, B41J 247, B41J 2435, B41J 4435

Patent

active

058051970

ABSTRACT:
In an LED printhead or the like, a plurality of LED arrays are arranged in a row. Opposite the LED arrays are driver IC chips providing current in respective current driving channels to respective LEDS. Current to an LED for recording of a pixel will be provided for say a duration related to a multibit image data signal. A data bus is provided for carrying the data signals. The data signals are latched in respective data registers associated with each current driving channel. A token bit shift register is provided for identifying a respective data register for latching of the multibit image data signal presently on the data bus. A direction of shifting of the token bit is determined through automatic self-sensing of the token bit itself as the token bit is moved from a boundary scan register that forms a part of a boundary scan test architecture.

REFERENCES:
patent: 4746941 (1988-05-01), Pham et al.
patent: 4750010 (1988-06-01), Ayers et al.
patent: 4831395 (1989-05-01), Pham et al.
patent: 5126759 (1992-06-01), Small
patent: 5300960 (1994-04-01), Pham et al.
patent: 5317344 (1994-05-01), Beaman et al.
patent: 5389953 (1995-02-01), Agar et al.

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