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|| FILE: #0155.PLD|| PROJ: 20120600|| PART: G16V8-#0155|||| DEV : GAL16V8|||| DESC: DECODER ATA 0/1||||GAL16V8||| INPUT| 1:A0, 2:A1, 3:A2, 4:A3, 5:RW, 6:PHI2, 7:ATA, 8:EN, 9:WA, 11:PHI0,|| OUTPUT| 12:HWO, 13:HWC, 14:GA, 15:IOR, 16:IOW, 17:CS0, 18:CS1, 19:HRD|| ACTIVE-LOW: HWC, HWO, HRD, CS0, CS1, GA, IOR, IOW|| PROPERTY:"SIMPLE"|| SIGNATURE: "0155 "||| --------------------------------------------------------|| INDIRIZZO I/O ATA| IOA = (ATA')|| --------------------------------------------------------|| ATAA => XXX0 - XXX7| ATAA = (IOA & A3')|| ATAB => XXXE - XXXF| ATAB = (IOA & A3 & A2 & A1)|| REGISTRO HIGH DATA ATA => XXXC| HDA0 = (IOA & A3 & A2 & A1' & A0')|| REGISTRO DATI 16 BIT ATA => XXX0| RDR0 = (ATAA & A2' & A1' & A0')|| --------------------------------------------------------|| CONTROLLO ATA|| CS0 => XXX0 - XXX7| CS0 = ATAA|| CS1 => XXXE - XXXF| CS1 = ATAB| ATAX = (ATAA # ATAB)| GA = ATAX|| --------------------------------------------------------|| SEGNALI ATA IOR, IOW|| IOR, IOW SINCRONIZZATI CON PHI2 (WA = 1)| RD1 = (ATAX & WA & RW & PHI2)| WR1 = (ATAX & WA & RW' & PHI0)|| IOR, IOW SINCRONIZZATI CON EN (WA = 0)| RD2 = (ATAX & WA' & RW & EN)| WR2 = (ATAX & WA' & RW' & EN)| IOR = (RD1 # RD2)| IOW = (WR1 # WR2)|| --------------------------------------------------------|| CONTROLLO REGISTRO HIGH ATA|| HWC => WRITE XXXC (comando clock)| HWC = (HDA0 & RW' & PHI0)|| HRD => READ XXXC| HRD = (HDA0 & RW)|| HWO => WRITE REG. ATA XXX0 (8 bit alti)| HWO = (RDR0 & RW')