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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | - | 1 | || FILE: #0004.PLD |
| 2 | || PROJ: 20120602 |
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| 3 | || PART: G22V10-#0004 |
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| 4 | || |
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| 5 | || DEV : GAL22V10 |
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| 6 | || |
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| 7 | || DESC: SECONDO DECODER |
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| 8 | || |
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| 9 | | |
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| 10 | |GAL22V10 |
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| 11 | | |
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| 12 | || INPUT |
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| 13 | | 1:SYS, 2:ML, 3:MH, 4:PBE, 5:PHI0, 6:RW, 7:PHI2, 8:Q17, 9:Q18, 10:CLB, |
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| 14 | | 11:PBX, 13:APW, 14:PWE, 15:DRE, 16:S, |
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| 15 | || OUTPUT |
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| 16 | | 17:EN, 18:ME, 19:CS2, 20:CS3, 21:CSF, 22:QX, 23:APS |
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| 17 | | |
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| 18 | | ACTIVE-LOW: CSF, CS2, CS3, ME |
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| 19 | | |
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| 20 | | SIGNATURE: "0004 " |
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| 21 | | |
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| 22 | || |
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| 23 | | EN = (PHI0 # PHI2) |
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| 24 | || |
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| 25 | || RAM DBR HIGH |
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| 26 | | DH1 = (MH & DRE & RW & CLB') |
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| 27 | | DH2 = (MH & RW' & PWE') |
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| 28 | | DH3 = (MH & RW' & CLB) |
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| 29 | || ME => DATA BANK MEMORY |
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| 30 | | MEX = (ML # DH1 # DH2 # DH3) |
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| 31 | | ME = ((MEX & S) # (MEX & S' & EN)) |
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| 32 | || |
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| 33 | || PBR |
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| 34 | | PB1 = (PBE & DRE' & RW) |
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| 35 | | PB2 = (PBE & CLB & RW) |
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| 36 | | PB3 = (PBE & PWE & CLB' & RW') |
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| 37 | | PBR = (PB1 # PB2 # PB3) |
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| 38 | | QX = (Q18 ## PBX) |
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| 39 | | A18 = QX |
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| 40 | | CSFX = (A18' & PBR) |
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| 41 | | CS2X = (A18 & PBR & Q17') |
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| 42 | | CS3X = (A18 & PBR & Q17) |
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| 43 | | CSF = ((CSFX & S) # (CSFX & S' & EN)) |
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| 44 | | CS2 = ((CS2X & S) # (CS2X & S' & EN)) |
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| 45 | | CS3 = ((CS3X & S) # (CS3X & S' & EN)) |
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| 46 | | APS = (PBE & PWE & CLB' & RW' & APW & SYS') |