41-02
From
Found on...[edit]
Equations[edit]
/**********************************************************************/
/*Super Off Road U54 */
/*decoder for various RAM/ROM CS lines, PA15, and /EXP */
/**********************************************************************/
/** Inputs **/
PIN 1 = i1;
PIN 2 = i2;
PIN 3 = i3;
PIN 4 = i4;
PIN 5 = i5;
PIN 6 = i6;
PIN 7 = i7;
PIN 8 = i8;
PIN 9 = i9;
/** Outputs **/
PIN 12 = o12;
PIN 13 = o13;
PIN 14 = o14;
PIN 15 = o15;
PIN 16 = o16;
PIN 17 = o17;
PIN 18 = o18;
PIN 19 = o19;
/** Logic Equations **/
!o12 = !i2 & !i3 & i4 & i5 & i6 #
i2 & !i3 #
!i1 & !i3;
!o13 = i1 & !i2 & i4 & !i5 & !i6 & i8 & i9 #
i1 & !i2 & !i4 & !i5 & i6 & i8 & i9 #
i1 & !i2 & !i4 & i5 & i8 & i9;
!o14 = i1 & !i2 & i4 & !i5 & !i6 & !i8 & i9 #
i1 & !i2 & !i4 & !i5 & i6 & !i8 & i9 #
i1 & !i2 & !i4 & i5 & !i8 & i9;
!o15 = i1 & !i2 & i4 & i5 & !i6 & i7 & !i8 & !i9 #
i1 & !i2 & i4 & !i5 & i6 & i7 & !i8 & !i9;
!o16 = i1 & !i2 & i4 & !i5 & i6;
!o17 = i1 & !i2 & i4 & !i5 & !i6 & i8 & !i9 #
i1 & !i2 & !i4 & !i5 & i6 & i8 & !i9 #
i1 & !i2 & !i4 & i5 & i8 & !i9;
!o18 = i1 & !i2 & !i4 & o13 & o14 & o15 & o17 #
i1 & !i2 & !i5 & o13 & o14 & o15 & o17 #
i1 & !i2 & !i6 & o13 & o14 & o15 & o17;
!o19 = i1 & !i2 & !i5 & !i6 & !i7 & !i8 & i9 #
i1 & !i2 & !i5 & !i6 & !i7 & i8 #
i1 & !i2 & !i4 & !i8 & !i9 #
i1 & !i2 & !i4 & !i5 & i6 & !i7 #
i1 & !i2 & !i4 & i5 & !i7 #
i1 & !i2 & !i4 & !i5 & !i6;
/* reverse engineered o18 had too many product terms by itself for 16V8
need to use feedback to be input of any /CS and not any of the other /CS output lines active
Original o18:
!o18 = i1 & !i2 & !i5 & i6 & !i7 & !i8 & !i9 #
i1 & !i2 & !i4 & !i5 & i6 & !i8 & !i9 #
i1 & !i2 & i4 & i5 & !i6 & i9 #
i1 & !i2 & i4 & i5 & !i6 & i8 #
i1 & !i2 & !i4 & i5 & !i8 & !i9 #
i1 & !i2 & i4 & !i5 & i6 & i9 #
i1 & !i2 & i4 & !i5 & i6 & i8 #
i1 & !i2 & !i6 & !i7 & !i8 & !i9 #
i1 & !i2 & !i5 & !i6 & !i8 & !i9 #
i1 & !i2 & !i4 & !i5 & !i6;
Combining all chip selects together:
!cs = i1 & !i2 & !i5 & i6 & !i7 & !i8 & !i9 #
i1 & !i2 & !i4 & !i5 & i6 & !i8 & !i9 #
i1 & !i2 & i4 & i5 & !i6 & i9 #
i1 & !i2 & i4 & i5 & !i6 & i8 #
i1 & !i2 & !i4 & i5 & !i8 & !i9 #
i1 & !i2 & i4 & !i5 & i6 & i9 #
i1 & !i2 & i4 & !i5 & i6 & i8 #
i1 & !i2 & !i6 & !i7 & !i8 & !i9 #
i1 & !i2 & !i5 & !i6 & !i8 & !i9 #
i1 & !i2 & !i4 & !i5 & !i6 #
i1 & !i2 & i4 & !i5 & !i6 & i8 & !i9 #
i1 & !i2 & !i4 & !i5 & i6 & i8 & !i9 #
i1 & !i2 & !i4 & i5 & i8 & !i9 #
i1 & !i2 & i4 & i5 & !i6 & i7 & !i8 & !i9 #
i1 & !i2 & i4 & !i5 & i6 & i7 & !i8 & !i9 #
i1 & !i2 & i4 & !i5 & !i6 & !i8 & i9 #
i1 & !i2 & !i4 & !i5 & i6 & !i8 & i9 #
i1 & !i2 & !i4 & i5 & !i8 & i9 #
i1 & !i2 & i4 & !i5 & !i6 & i8 & i9 #
i1 & !i2 & !i4 & !i5 & i6 & i8 & i9 #
i1 & !i2 & !i4 & i5 & i8 & i9;
Checking minimized output equation in .doc file shows /CS is:
!cs = i1 & !i2 & !i4 #
i1 & !i2 & !i5 #
i1 & !i2 & !i6;
*/
