COM (Ternary Gate): Difference between revisions
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I do not know yet if this gate is useful to Compare say two registers. | I do not know yet if this gate is useful to Compare say two registers. | ||
This gate is biased towards the A input. Only when A is zero does B have any effect. | |||
== Truth Tables == | == Truth Tables == | ||
=== COM === | |||
[[File:COM_GATE.png|thumb|alt=Com Gate Symbol|Com Gate Symbol]] | |||
<div class="tt"> | <div class="tt"> | ||
<table class="tt"> | <table class="tt"> | ||
| Line 21: | Line 25: | ||
<td rowspan="3"><b>A</b></td> | <td rowspan="3"><b>A</b></td> | ||
<td class="tt_r tt_br">-</td> | <td class="tt_r tt_br">-</td> | ||
<td class="tt_r">-</td> | <td class="tt_r">-</td> | ||
<td class="tt_r">-</td> | <td class="tt_r">-</td> | ||
| Line 40: | Line 45: | ||
<table class="tt"> | <table class="tt"> | ||
<tr> | |||
<td colspan="3">COM</td> | |||
</tr> | |||
<tr> | <tr> | ||
<td class="tt_bb"><b>A</b></td> | <td class="tt_bb"><b>A</b></td> | ||
| Line 92: | Line 100: | ||
</table> | </table> | ||
</div> | </div> | ||
<hr /> | |||
=== NCOM === | |||
<div class="tt"> | |||
<table class="tt"> | |||
<tr> | |||
<td class="tt_br tt_bb" colspan="2" rowspan="2">NCOM</td> | |||
<td colspan="3" class="tce"><b>B</b></td> | |||
</tr> | |||
<tr> | |||
<td class="tt_r tt_bb">-</td> | |||
<td class="tt_g tt_bb">0</td> | |||
<td class="tt_b tt_bb">+</td> | |||
</tr> | |||
<tr> | |||
<td rowspan="3"><b>A</b></td> | |||
<td class="tt_r tt_br">-</td> | |||
<td class="tt_b">+</td> | |||
<td class="tt_b">+</td> | |||
<td class="tt_b">+</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_g tt_br">0</td> | |||
<td class="tt_b">+</td> | |||
<td class="tt_g">0</td> | |||
<td class="tt_r">-</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_b tt_br">+</td> | |||
<td class="tt_r">-</td> | |||
<td class="tt_r">-</td> | |||
<td class="tt_r">-</td> | |||
</tr> | |||
</table> | |||
<table class="tt"> | |||
<tr> | |||
<td colspan="3">NCOM</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_bb"><b>A</b></td> | |||
<td class="tt_bb"><b>B</b></td> | |||
<td class="tt_bl tt_bb"><b>Y</b></td> | |||
</tr> | |||
<tr> | |||
<td class="tt_r">-</td> | |||
<td class="tt_r">-</td> | |||
<td class="tt_bl tt_b">+</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_r">-</td> | |||
<td class="tt_g">0</td> | |||
<td class="tt_bl tt_b">+</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_r">-</td> | |||
<td class="tt_b">+</td> | |||
<td class="tt_bl tt_b">+</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_g">0</td> | |||
<td class="tt_r">-</td> | |||
<td class="tt_bl tt_b">+</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_g">0</td> | |||
<td class="tt_g">0</td> | |||
<td class="tt_bl tt_g">0</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_g">0</td> | |||
<td class="tt_b">+</td> | |||
<td class="tt_bl tt_r">-</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_b">+</td> | |||
<td class="tt_r">-</td> | |||
<td class="tt_bl tt_r">-</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_b">+</td> | |||
<td class="tt_g">0</td> | |||
<td class="tt_bl tt_r">-</td> | |||
</tr> | |||
<tr> | |||
<td class="tt_b">+</td> | |||
<td class="tt_b">+</td> | |||
<td class="tt_bl tt_r">-</td> | |||
</tr> | |||
</table> | |||
</div> | |||
[[Category:Ternary]] | |||
[[Category:Logic_Gates]] | |||
Latest revision as of 03:52, 13 September 2024
Compare
Uses
A tree of compares can compute if a register is negative, zero, or positive. This is done as part of the ALU Flags.
I do not know yet if this gate is useful to Compare say two registers.
This gate is biased towards the A input. Only when A is zero does B have any effect.
Truth Tables
COM
| COM | B | |||
| - | 0 | + | ||
| A | - | - | - | - |
| 0 | - | 0 | + | |
| + | + | + | + | |
| COM | ||
| A | B | Y |
| - | - | - |
| - | 0 | - |
| - | + | - |
| 0 | - | - |
| 0 | 0 | 0 |
| 0 | + | + |
| + | - | + |
| + | 0 | + |
| + | + | + |
NCOM
| NCOM | B | |||
| - | 0 | + | ||
| A | - | + | + | + |
| 0 | + | 0 | - | |
| + | - | - | - | |
| NCOM | ||
| A | B | Y |
| - | - | + |
| - | 0 | + |
| - | + | + |
| 0 | - | + |
| 0 | 0 | 0 |
| 0 | + | - |
| + | - | - |
| + | 0 | - |
| + | + | - |
