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||      FILE:   #0007.PLD
||      PROJ:   20120605        
||      PART:   G26CV12-#0007
||
||      DEV :   GAL26CV12
||
||      DESC:   DECODER MEMORIA DI SISTEMA
||
|
|GAL26CV12
|
|| INPUT
|  1:MA19, 2:MA20, 3:CS0, 4:CS2, 5:CS3, 6:CSF, 8:CX1, 9:PHI0, 10:RW, 
| 11:PHI2, 12:MW0, 13:-, 14:-, 28:CPU,
|| OUTPUT 
|  15:G, 16:CE0, 17:CE2, 18:CE3, 19:CEF, 20:WE, 22:RD, 23:CE4, 
|  24:CE5, 25:CE6, 26:CE7, 27:CE8
|
| ACTIVE-LOW: G, CE0, CE2, CE3, CEF, WE, RD, CE4, CE5, CE6, CE7, CE8 
|
|
| SIGNATURE: "0007    "
|
||
|| BUFFER 2MB - ABILITATO DA /CX1
|  CE4 = (CX1' & PHI2 & MA20' & MA19')
|  CE5 = (CX1' & PHI2 & MA20' & MA19)
|  CE6 = (CX1' & PHI2 & MA20  & MA19')
|  CE7 = (CX1' & PHI2 & MA20  & MA19)
||
|| RAM 512K PER CPU 8 BIT - ABILITATA DA /CS0
|  CE8 = (CS0' & PHI2 & CPU')
||
|| RAM 128K PER CPU 16 BIT - ABILITATA DA /CS0
|  CE0 = (CS0' & PHI2 & CPU)
||
|| RAM 128K - ABILITATE DA /CS2 e /CS3
|  CE2 = (CS2' & PHI2)
|  CE3 = (CS3' & PHI2)
||
|| FLASH 512K (16 bit) / 256K (8 bit - A18 = 0) ABILITATA DA /CSF
|  CEF = (CSF' & PHI2)
||
|| BUFFER DATI
|  MS = (CS0' # CS2' # CS3' # CSF' # CX1')
|  G = (MS & PHI2)
||
|| READ & WRITE ENABLE
|  RD  = (MS & PHI2 & RW)
|  WRA = (MS & PHI2 & RW' & MW0)
|  WRB = (MS & PHI0 & RW' & MW0')
|  WE  = (WRA # WRB)