43 lines
741 B
Plaintext
43 lines
741 B
Plaintext
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Name Z80_Dec;
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Partno g16v8;
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Date 25/04/17;
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Revision 00;
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Designer Paolo Iocco;
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Company GC73;
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Assembly 00;
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Location Munich;
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Device G16V8;
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/* ****************************** */
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/* Z80 memory and I/O decoder */
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/* Memory Map */
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/* 0000-1FFF EPROM */
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/* 2000-3FFF RAM */
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/* xxx IO0 */
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/* yyy IO1 */
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/* ****************************** */
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/** Inputs **/
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pin 2 = A15;
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pin 3 = A14;
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pin 4 = A13;
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pin 5 = A7;
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pin 6 = A6;
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pin 7 = !MREQ;
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pin 8 = !IOREQ;
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/** Outputs **/
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pin 19 = EPROM;
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pin 18 = RAM;
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pin 17 = IO0;
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pin 16 = IO1;
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/** Logic Equations **/
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!EPROM = !A15 & !A14 & !A13 & !MREQ ;
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!RAM = !A15 & !A14 & A13 & !MREQ ;
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!IO0 = !A7 & !A6 & !IOREQ ;
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!IO1 = !A7 & A6 & !IOREQ ;
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