Programmable logic with carry-in/carry-out between logic blocks

Details Programmable logic with carry-in/carry-out between logic blocks Programmable logic with carry-in/carry-out between logic blocks

1993-01-21

1994-10-25

Hudspeth, David R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307472, 364788, H03K 19177

Patent

active

053592425

ABSTRACT:
A programmable logic device. The device includes reprogrammable logic for generating at least one sum-of-products signal (113) and a control term (115). The device further includes a sum-of-products processing circuit (201). The sum of products processing circuit is adapted to produce a logical XOR of the control term and the sum-of-products term when a carry-in signal (203) from adjacent reprogrammable logic is disabled, and a sum of the carry-in bit, the sum-of-products term, and the control term when the carry-in bit is enabled. Signal storage means (118) is coupled to an output of the sum-of products processing circuit.

REFERENCES:
patent: 4758746 (1988-07-01), Birkner et al.
Egan, "MAX 7000 family faster, denser, more flexible than MAX 5000 parts," Computer Design (1992) 31:118.
Agarwala et al., "Application Specific Logic Module Architecture for FPGAs," IEEE 1992 Custom Integrated Circuits Conference, pp. 4.1.1-4.1.4.
Bursky, "FPGA Advances Cut Delays, Add Flexibility," Electronic Design (1992) 40:35-43.

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