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||	FILE:	#0001.PLD
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||	PROJ:	20120607
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||	PART:	G16V8-#0001
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||
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||	DEV :	GAL16V8
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||
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|| 	DESC:	DMA CONTROL
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||
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|
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|GAL16V8A
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|
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|| INPUT
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|  1:DAEN, 2:HRQ, 3:EOP, 4:RES, 5:DME, 6:DMR, 7:FDR, 8:XTC, 9:-, 11:-,
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|| OUTPUT
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|  12:OE, 13:DRS, 14:HLD, 15:XTCP, 16:FRS, 17:TC, 18:AEN, 19:AENN
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|
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| ACTIVE-LOW: OE, AENN
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|
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| PROPERTY:"SIMPLE"
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|
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| SIGNATURE: "0001    "
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|
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|| --------------------------------------------------------
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|| /OE  -> abilitazione output latch address 82C37
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|| AEN  -> abilitazione buffer address CPU
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|| HLD  -> abilitazione DMA 82C37
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|| DAEN <- da 82C37 - abilitazione latch address
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|| HRQ  <- da 82C37 - richiesta DMA
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|| /DME <- abilitazione DMA da CPU
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|| AENX, HRQX -> attivi solo se DME LOW
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|  AENX  = DAEN & DME'
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|  HRQX  = HRQ & DME'
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|  OE    = AENX
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|  HLD   = HRQX
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|  AEN   = (AENX # HRQX)
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||  AEN   = (DME')
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|  AENN  = (AENX # HRQX)
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||
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|| DRS -> reset 82C37 (impulso positivo)
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|| attivo o per reset hardware o per comando /DMR da CPU
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|  DRS   = ((RES') # (DMR)')
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|| FRS -> reset hardware per UM8388 (impulso positivo)
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|  FRS   = ((RES') # (FDR)')
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||
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|| XTCP - inversione TC esterno da CPU
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|  XTCP  = XTC'
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|| TC -> terminal count per UM8388
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|  TC    = EOP'