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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | - | 1 | || FILE: #0155.PLD |
| 2 | || PROJ: 20120600 |
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| 3 | || PART: G16V8-#0155 |
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| 4 | || |
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| 5 | || DEV : GAL16V8 |
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| 6 | || |
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| 7 | || DESC: DECODER ATA 0/1 |
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| 8 | || |
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| 9 | | |
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| 10 | |GAL16V8 |
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| 11 | | |
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| 12 | || INPUT |
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| 13 | | 1:A0, 2:A1, 3:A2, 4:A3, 5:RW, 6:PHI2, 7:ATA, 8:EN, 9:WA, 11:PHI0, |
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| 14 | || OUTPUT |
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| 15 | | 12:HWO, 13:HWC, 14:GA, 15:IOR, 16:IOW, 17:CS0, 18:CS1, 19:HRD |
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| 16 | | |
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| 17 | | ACTIVE-LOW: HWC, HWO, HRD, CS0, CS1, GA, IOR, IOW |
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| 18 | | |
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| 19 | | PROPERTY:"SIMPLE" |
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| 20 | | |
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| 21 | | SIGNATURE: "0155 " |
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| 22 | | |
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| 23 | || -------------------------------------------------------- |
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| 24 | || INDIRIZZO I/O ATA |
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| 25 | | IOA = (ATA') |
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| 26 | || -------------------------------------------------------- |
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| 27 | || ATAA => XXX0 - XXX7 |
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| 28 | | ATAA = (IOA & A3') |
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| 29 | || ATAB => XXXE - XXXF |
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| 30 | | ATAB = (IOA & A3 & A2 & A1) |
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| 31 | || REGISTRO HIGH DATA ATA => XXXC |
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| 32 | | HDA0 = (IOA & A3 & A2 & A1' & A0') |
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| 33 | || REGISTRO DATI 16 BIT ATA => XXX0 |
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| 34 | | RDR0 = (ATAA & A2' & A1' & A0') |
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| 35 | || -------------------------------------------------------- |
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| 36 | || CONTROLLO ATA |
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| 37 | || CS0 => XXX0 - XXX7 |
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| 38 | | CS0 = ATAA |
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| 39 | || CS1 => XXXE - XXXF |
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| 40 | | CS1 = ATAB |
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| 41 | | ATAX = (ATAA # ATAB) |
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| 42 | | GA = ATAX |
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| 43 | || -------------------------------------------------------- |
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| 44 | || SEGNALI ATA IOR, IOW |
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| 45 | || IOR, IOW SINCRONIZZATI CON PHI2 (WA = 1) |
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| 46 | | RD1 = (ATAX & WA & RW & PHI2) |
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| 47 | | WR1 = (ATAX & WA & RW' & PHI2) |
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| 48 | || IOR, IOW SINCRONIZZATI CON EN (WA = 0) |
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| 49 | | RD2 = (ATAX & WA' & RW & EN) |
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| 50 | | WR2 = (ATAX & WA' & RW' & EN) |
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| 51 | | IOR = (RD1 # RD2) |
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| 52 | | IOW = (WR1 # WR2) |
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| 53 | || -------------------------------------------------------- |
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| 54 | || CONTROLLO REGISTRO HIGH ATA |
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| 55 | || HWC => WRITE XXXC (comando clock) |
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| 56 | | HWC = (HDA0 & RW' & PHI0) |
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| 57 | || HRD => READ XXXC |
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| 58 | | HRD = (HDA0 & RW) |
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| 59 | || HWO => WRITE REG. ATA XXX0 (8 bit alti) |
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| 60 | | HWO = (RDR0 & RW') |