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Logic function blocks
25
OR function blocks are used to form general combinatory expressions with boolean
variables. The function block (figure 8) has six inputs, designated Onnn-INPUTm,
where nnn presents the serial number of the block, and m presents the serial number of
the inputs in the block. Each OR circuit has two outputs, Onnn-OUT and Onnn-NOUT
(inverted).
Onnn
INPUT1
INPUT2
≥1
INPUT3
INPUT4
INPUT5
INPUT6
)LJXUH
)XQFWLRQ EORFN GLDJUDP RI WKH 25 IXQFWLRQ
The output signal (OUT) is set to 1 if any of the inputs (INPUT1-6) is 1. See truth table
below.
7DEOH
7UXWK WDEOH IRU WKH 25 IXQFWLRQ EORFN
,1387
,1387
,1387
0
0
0
0
0
0
0
0
0
...
...
...
1
1
1
1
1
1
OUT
NOUT
1
xx00000514.vsd
,1387
,1387
0
0
0
0
0
1
...
...
1
1
1
1
&KDSWHU
&RPPRQ IXQFWLRQV
,1387
287
1287
0
0
1
1
1
0
0
1
0
...
1
0
0
1
0
1
1
0
35
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