Bi-directional programmable I/O cell

Details Bi-directional programmable I/O cell Bi-directional programmable I/O cell

1995-03-09

1997-02-11

Hudspeth, David R.

Electronic digital logic circuitry

Multifunctional or programmable

Array

326 30, 326 86, H03K 190175

Patent

active

056024940

ABSTRACT:
A bi-directional programmable I/O cell is disclosed. The bi-directional programmable I/O cell has variable electrical characteristics which are selected via control inputs. The variable electrical characteristics can include a data transmission mode, an input bias impedance value and an input bias direction mode. The input bias direction mode has an independent submode and a dependent submode. The dependent submode can operate in a ring latch mode or an active termination mode. The independent submode is further comprised of a static submode and a dynamic submode. The static submode is further comprised of a pull-up mode and a pull-down mode. The bias impedance value is can be selected from a plurality of impedances. The bi-directional programmable I/O cell has a continuous or pulsed output in the data transmission mode.

REFERENCES:
patent: 4758746 (1988-07-01), Birkner et al.
patent: 5134311 (1992-07-01), Biber et al.
patent: 5162672 (1992-11-01), McMahan et al.
patent: 5172014 (1992-12-01), El Ayat et al.
patent: 5394034 (1995-02-01), Becker et al.
patent: 5448182 (1995-09-01), Countryman et al .

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