Signetics Programmable Logic Devices - Al Kossow's Bitsavers

Signetics
Introduction
Signetics
Programmable Logic
Programmable Logic Devices
WHAT IS PROGRAMMABLE
LOGIC
In 1975, Signetics Corporation developed
a new product family by combining its
expertise in semi-custom gate array
products and fuse-link Programmable
Read Only Memories (PROMs). Out of
this marriage came Signetics Programmable
Logic Family. The PLS100 Field­
Programmable Logic Array (FPLA) was
the first member of this family. The FPLA
was an important industry first in two
ways. First, the ANDIOR/INVERT arch i-
tecture allowed the custom implementations
of Sum of Product logic equations.
Second, the three-level fusing allows
complete flexibility in the use of this device
family. All logic interconnections from
input to output are programmable.
R
PR
Op
STATE
REGISTER
NOTES:
1. P, C, N, F and PIE are user-prograrrmable connections.
Figure 1. High Speed Sequencer
January 1990
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