Method for user-controlled I/O switching during in-circuit progr

Details Method for user-controlled I/O switching during in-circuit progr Method for user-controlled I/O switching during in-circuit progr

1996-10-22

1998-09-08

Beausoliel, Jr., Robert W.

Excavating

326 39, G01R 3128

Patent

active

058056076

ABSTRACT:
A programmable logic device operable to generate different control signals during a time interval when it is being reconfigured includes a plurality of I/O pins (18a-18f), boundary scan circuitry (14) operatively connected to the I/O pins for loading a new set of data and for driving the new set of data onto the I/O pins, and means for programming (33) the programmable logic device on a row-by-row basis when loaded with program instructions. Control circuitry (31a) is provided to control the programming means to be operated on a self-timed interval for programming each row so that the boundary scan circuitry can be loaded with additional sets of data to generate the different control signals. The control circuitry includes a programming timer register (70) and a programming status register (68).

REFERENCES:
patent: 5231314 (1993-07-01), Andrews
patent: 5347519 (1994-09-01), Cooke et al.
patent: 5355369 (1994-10-01), Greenbergerl et al.
patent: 5412260 (1995-05-01), Tsui et al.
patent: 5426738 (1995-06-01), Hsieh et al.
patent: 5428624 (1995-06-01), Blair et al.
patent: 5448525 (1995-09-01), Struges

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