Logic simulator using small capacity memories for storing logic

Details Logic simulator using small capacity memories for storing logic Logic simulator using small capacity memories for storing logic

1985-08-01

1988-11-01

Zache, Raulfe B.

Boots, shoes, and leggings

364900, 364578, 371 23, G06F 1520, G06F 738

Patent

active

047824409

ABSTRACT:
A logic simulator for simulating operation of a logic circuit is provided with gates divisible into successive levels according to a connection pattern between the gates. A pattern memory (16) memorizes the connection pattern as a bit sequence representative of direct connections between each gate of each level to the gates of a preceding level. A function memory (17) memorizes logic functions of the respective gates. Responsive to input logic states of each level, the bit sequence for the gates of the level under consideration, and the logic functions of the respective gates of that level, a calculator (25) calculates output logic states of that level as input logic states of a succeeding level successively for the gates of the level in question. For a higher speed of simulation, the logic circuitry may be divided into a predetermined number of gate groups, each consisting of gates of the successive levels. Each of the pattern and the function memories is divided into parts for the respective gate groups. In order to make the logic simulator have a further reduced memory capacity, the gates of each preceding level may be classified into gate blocks. A block specifier is additionally used. Under the circumstances, it is sufficient that each bit sequence should represent direct connections to the gate blocks. The calculator is supplied with the output logic states of each gate block.

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