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A programmable logic array (PLA) construction is described wherein the ELSE condition is implemented using, at most, one word line, as opposed to many word lines.
English (United States)
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PLA ELSE Clause Implementation
A programmable logic array (PLA) construction is described wherein the
ELSE condition is implemented using, at most, one word line, as opposed to
many word lines.
A PLA can be used to simulate the IF-THEN-ELSE proposition frequently
found in software programs. "IF" the AND array input A has a predetermined bit
pattern, "THEN" the word line 1 is activated. "ELSE" the word line 2 is activated.
This is accomplished by way of special logic located between the AND array and
the OR array and represented by inverter circuit 3 and AND circuit 4. In other
words, when the "THEN" word line l is not activated, the "ELSE" word line 2 is
When the PLA is used as a finite-state control unit, the AND array input B
indicates the state the PLA is in. The input A includes the data which the PLA
uses to guide the control function. The AND array personalization pattern for the
B input line are identical for both word line l and word line 2 so that the "ELSE"
condition and the "IF-- THEN" condition fall within the same machine state. If
the PLA is used in an application where the B input lines have no effect on the
IF-- THEN-ELSE function, then the AND circuit 4 may be omitted and the output
of the inverter circuit 3 connected directly to the "ELSE" word line 2.
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