117 lines
3.3 KiB
Plaintext
117 lines
3.3 KiB
Plaintext
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Name 6502_DECODER;
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Partno Lattice22V10B;
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Date 02/04/15;
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Revision 01;
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Designer shalewyn.com;
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Company shalewyn.com;
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Assembly XXXXX;
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Location XXXXX;
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Device g22v10;
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/*
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* Lattice GAL 22V10B pinout, DIP, top view
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*
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* I/CLK.[ 1 24 ].VCC
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* I.[ 2 23 ].I/O/Q
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* I.[ 3 22 ].I/O/Q
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* I.[ 4 21 ].I/O/Q
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* I.[ 5 20 ].I/O/Q
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* I.[ 6 19 ].I/O/Q
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* I.[ 7 18 ].I/O/Q
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* I.[ 8 17 ].I/O/Q
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* I.[ 9 16 ].I/O/Q
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* I.[ 10 15 ].I/O/Q
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* I.[ 11 14 ].I/O/Q
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* GND.[ 12 13 ].I
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*
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*
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*
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* $1000-$1FFF - %0000 0000 0000 0000 - %0001 1111 1111 1111
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* $2000-$7FFF - %0010 0000 0000 0000 - %0111 1111 1111 1111
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* $8000-$800F - %1000 0000 0000 0000 - %1000 0000 0000 1111
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* $8010-$801F - %1000 0000 0001 0000 - %1000 0000 0001 1111
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* $8020-$802F - %1000 0000 0010 0000 - %1000 0000 0010 1111
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* $8040-$804F - %1000 0000 0100 0000 - %1000 0000 0100 1111
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* $9000-$FFFF - %1001 0000 0000 0000 - %1111 1111 1111 1111
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*
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*
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* !Pin 17 - non-swap RAM $0000-$1FFF
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* !Pin 18 - Swap bank 0 - $2000-$7FFF
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* !Pin 19 - Swap bank 1 - $2000-$7FFF
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* !Pin 21 - /VIA 1 - $8000-$800F
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* !Pin 22 - /VIA 2 - $8010-$801F
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* !Pin 23 - /ROM - $9000-$FFFF
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*
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*
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* Inputs
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*/
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/* Inputs */
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PIN 1 = PHI2;
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PIN 2 = R_W;
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PIN [3..6] = [A15..12];
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PIN [7..9] = [A6..4];
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PIN 10 = sb0;
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PIN 11 = sb1;
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/* Outputs */
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PIN 14 = !RD;
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PIN 15 = !WR;
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PIN 16 = !VIA1;
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PIN 17 = !VIA2;
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PIN 18 = !BASERAM;
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PIN 19 = !SWAPBANK0;
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PIN 20 = !SWAPBANK1;
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PIN 21 = !SWAPBANK2;
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PIN 22 = !SWAPBANK3;
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PIN 23 = !ROM;
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/* Rules */
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RD = PHI2 & R_W;
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WR = PHI2 & !R_W;
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BASERAM = !A15 & !A14 & !A13 & !A12;
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SWAPBANK0 = !A15 & !A14 & A13 & !A12 & !sb0 & !sb1
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# !A15 & !A14 & A13 & A12 & !sb0 & !sb1
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# !A15 & A14 & !A13 & !A12 & !sb0 & !sb1
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# !A15 & A14 & !A13 & A12 & !sb0 & !sb1
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# !A15 & A14 & A13 & !A12 & !sb0 & !sb1
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# !A15 & A14 & A13 & A12 & !sb0 & !sb1;
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SWAPBANK1 = !A15 & !A14 & A13 & !A12 & !sb0 & sb1
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# !A15 & !A14 & A13 & A12 & !sb0 & sb1
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# !A15 & A14 & !A13 & !A12 & !sb0 & sb1
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# !A15 & A14 & !A13 & A12 & !sb0 & sb1
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# !A15 & A14 & A13 & !A12 & !sb0 & sb1
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# !A15 & A14 & A13 & A12 & !sb0 & sb1;
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SWAPBANK2 = !A15 & !A14 & A13 & !A12 & sb0 & !sb1
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# !A15 & !A14 & A13 & A12 & sb0 & !sb1
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# !A15 & A14 & !A13 & !A12 & sb0 & !sb1
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# !A15 & A14 & !A13 & A12 & sb0 & !sb1
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# !A15 & A14 & A13 & !A12 & sb0 & !sb1
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# !A15 & A14 & A13 & A12 & sb0 & !sb1;
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SWAPBANK3 = !A15 & !A14 & A13 & !A12 & !sb0 & sb1
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# !A15 & !A14 & A13 & A12 & sb0 & sb1
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# !A15 & A14 & !A13 & !A12 & sb0 & sb1
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# !A15 & A14 & !A13 & A12 & sb0 & sb1
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# !A15 & A14 & A13 & !A12 & sb0 & sb1
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# !A15 & A14 & A13 & A12 & sb0 & sb1;
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VIA1 = A15 & !A14 & !A13 & !A12 & !A5 & !A4;
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VIA2 = A15 & !A14 & !A13 & !A12 & !A5 & A4;
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ROM = A15 & !A14 & !A13 & A12
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# A15 & !A14 & A13 & !A12
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# A15 & !A14 & A13 & A12
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# A15 & A14 & !A13 & !A12
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# A15 & A14 & !A13 & A12
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# A15 & A14 & A13 & !A12
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# A15 & A14 & A13 & A12;
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