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| == Found on... == | | == Found on... == |
| *[[Super Off Road]] | | *[[Super Off Road]] |
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| == Equations ==
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| <pre>
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| /**********************************************************************/
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| /*Super Off Road U54 */
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| /*decoder for various RAM/ROM CS lines, PA15, and /EXP */
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| /**********************************************************************/
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|
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| /** Inputs **/
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|
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| PIN 1 = i1;
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| PIN 2 = i2;
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| PIN 3 = i3;
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| PIN 4 = i4;
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| PIN 5 = i5;
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| PIN 6 = i6;
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| PIN 7 = i7;
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| PIN 8 = i8;
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| PIN 9 = i9;
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|
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| /** Outputs **/
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|
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| PIN 12 = o12;
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| PIN 13 = o13;
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| PIN 14 = o14;
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| PIN 15 = o15;
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| PIN 16 = o16;
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| PIN 17 = o17;
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| PIN 18 = o18;
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| PIN 19 = o19;
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|
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| /** Logic Equations **/
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|
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| !o12 = !i2 & !i3 & i4 & i5 & i6 #
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| i2 & !i3 #
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| !i1 & !i3;
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|
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| !o13 = i1 & !i2 & i4 & !i5 & !i6 & i8 & i9 #
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| i1 & !i2 & !i4 & !i5 & i6 & i8 & i9 #
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| i1 & !i2 & !i4 & i5 & i8 & i9;
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|
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| !o14 = i1 & !i2 & i4 & !i5 & !i6 & !i8 & i9 #
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| i1 & !i2 & !i4 & !i5 & i6 & !i8 & i9 #
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| i1 & !i2 & !i4 & i5 & !i8 & i9;
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|
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| !o15 = i1 & !i2 & i4 & i5 & !i6 & i7 & !i8 & !i9 #
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| i1 & !i2 & i4 & !i5 & i6 & i7 & !i8 & !i9;
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|
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| !o16 = i1 & !i2 & i4 & !i5 & i6;
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|
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| !o17 = i1 & !i2 & i4 & !i5 & !i6 & i8 & !i9 #
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| i1 & !i2 & !i4 & !i5 & i6 & i8 & !i9 #
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| i1 & !i2 & !i4 & i5 & i8 & !i9;
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|
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| !o18 = i1 & !i2 & !i4 & o13 & o14 & o15 & o17 #
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| i1 & !i2 & !i5 & o13 & o14 & o15 & o17 #
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| i1 & !i2 & !i6 & o13 & o14 & o15 & o17;
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|
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| !o19 = i1 & !i2 & !i5 & !i6 & !i7 & !i8 & i9 #
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| i1 & !i2 & !i5 & !i6 & !i7 & i8 #
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| i1 & !i2 & !i4 & !i8 & !i9 #
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| i1 & !i2 & !i4 & !i5 & i6 & !i7 #
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| i1 & !i2 & !i4 & i5 & !i7 #
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| i1 & !i2 & !i4 & !i5 & !i6;
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|
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|
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| /* reverse engineered o18 had too many product terms by itself for 16V8
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| need to use feedback to be input of any /CS and not any of the other /CS output lines active
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|
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| Original o18:
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|
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| !o18 = i1 & !i2 & !i5 & i6 & !i7 & !i8 & !i9 #
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| i1 & !i2 & !i4 & !i5 & i6 & !i8 & !i9 #
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| i1 & !i2 & i4 & i5 & !i6 & i9 #
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| i1 & !i2 & i4 & i5 & !i6 & i8 #
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| i1 & !i2 & !i4 & i5 & !i8 & !i9 #
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| i1 & !i2 & i4 & !i5 & i6 & i9 #
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| i1 & !i2 & i4 & !i5 & i6 & i8 #
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| i1 & !i2 & !i6 & !i7 & !i8 & !i9 #
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| i1 & !i2 & !i5 & !i6 & !i8 & !i9 #
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| i1 & !i2 & !i4 & !i5 & !i6;
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|
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|
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| Combining all chip selects together:
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|
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| !cs = i1 & !i2 & !i5 & i6 & !i7 & !i8 & !i9 #
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| i1 & !i2 & !i4 & !i5 & i6 & !i8 & !i9 #
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| i1 & !i2 & i4 & i5 & !i6 & i9 #
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| i1 & !i2 & i4 & i5 & !i6 & i8 #
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| i1 & !i2 & !i4 & i5 & !i8 & !i9 #
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| i1 & !i2 & i4 & !i5 & i6 & i9 #
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| i1 & !i2 & i4 & !i5 & i6 & i8 #
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| i1 & !i2 & !i6 & !i7 & !i8 & !i9 #
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| i1 & !i2 & !i5 & !i6 & !i8 & !i9 #
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| i1 & !i2 & !i4 & !i5 & !i6 #
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|
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| i1 & !i2 & i4 & !i5 & !i6 & i8 & !i9 #
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| i1 & !i2 & !i4 & !i5 & i6 & i8 & !i9 #
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| i1 & !i2 & !i4 & i5 & i8 & !i9 #
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|
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| i1 & !i2 & i4 & i5 & !i6 & i7 & !i8 & !i9 #
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| i1 & !i2 & i4 & !i5 & i6 & i7 & !i8 & !i9 #
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|
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| i1 & !i2 & i4 & !i5 & !i6 & !i8 & i9 #
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| i1 & !i2 & !i4 & !i5 & i6 & !i8 & i9 #
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| i1 & !i2 & !i4 & i5 & !i8 & i9 #
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|
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| i1 & !i2 & i4 & !i5 & !i6 & i8 & i9 #
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| i1 & !i2 & !i4 & !i5 & i6 & i8 & i9 #
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| i1 & !i2 & !i4 & i5 & i8 & i9;
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|
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|
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| Checking minimized output equation in .doc file shows /CS is:
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|
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| !cs = i1 & !i2 & !i4 #
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| i1 & !i2 & !i5 #
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| i1 & !i2 & !i6;
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| */
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| </pre>
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