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