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||	FILE:	#9005.PLD
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||	PROJ:	20130517
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||	PART:	G20V8-#9005
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||
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||	DEV :	GAL20V8
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||
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|| 	DESC:	I/O DECODER & CONTROL
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||
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|
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|GAL20V8A
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|
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|| INPUT
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|  1:A1, 2:A2, 3:A3, 4:A4, 5:A5, 6:A6, 7:A7, 8:IO0, 9:RW, 10:PHI2,
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|  11:EN, 13:RDYN, 14:RAMN, 23:-,
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|| OUTPUT
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|  22:DBE, 21:VDC, 20:PIA, 19:WFF, 18:CRD, 17:CWE, 16:RD, 15:WIO
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|
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| SIGNATURE: "9005    "
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|
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|  ACTIVE-LOW: DBE, VDC, PIA, WFF, CRD, CWE, RD, WIO
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|
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|  PROPERTY: "SIMPLE"
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|
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|| --------------------------------------------------------
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|| IO SELECT => FF70-FF77 (65C02) - FC70-FC77 (65C816)
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|  IOS  = (IO0' & A7' & A6 & A5 & A4 & A3')
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|| R6545/HD6445 => FF70-FF71 / FC70-FC71
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|  CRTC = (IOS & A2' & A1')
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|| REGISTRO WRITE ONLY => FF72
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|  WREG = (IOS & A2' & A1 & RW')
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|| PIA 65C21 => FF74-FF77 / FC74-FC77
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|  PIAS = (IOS & A2)
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|| RD => segnale OE per RAM
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|  RD = (RW & PHI2)
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|| CRD, CWE => segnali read,write per HD6545 (qualificati con EN)
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|  CRD = (CRTC & RW & EN)
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|  CWE = (CRTC & RW' & EN)
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|| ABILITAZIONE CRTC e PIA
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|  PIA = PIAS
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|  VDC = CRTC
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|| CLOCK per registro FF
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|  WFF = (WREG & RDYN)
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|| SEGNALE WAIT I/O
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|  WIO = (CRTC # WREG)
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|| SEGNALE ABILITAZIONE 74x245
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|  DBEIO = ((CRTC & EN) # (WREG & (EN # RDYN)) # (PIAS & PHI2))
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|  DBEM  = RAMN'
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|  DBE = (DBEIO # DBEM)