Complementary macrocell feedback circuit

Details Complementary macrocell feedback circuit Complementary macrocell feedback circuit

1993-03-05

1994-07-12

Hudspeth, David R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307243, H03K 19177

Patent

active

053291816

ABSTRACT:
In a programmable logic device having I/O blocks and logic blocks, two lines leading from a region including a logic block and an I/O block alternately provide a logic block output signal and its complement or a logic block output signal and an I/O block input signal. A multiplexer selects between providing on a line leading from an I/O block to an interconnect structure a first signal which is provided by the I/O block when the I/O block is an input buffer and a second signal which is the inverse of a logic signal provided to the I/O block when the I/O block is not an input buffer. Thus in one case two lines which extend from the I/O block to the interconnect structure may carry

REFERENCES:
patent: 4857773 (1989-08-01), Takata et al.
patent: 4903223 (1990-02-01), Norman et al.
patent: 4987319 (1991-01-01), Kawana

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