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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | - | 1 | || FILE: #0007.PLD |
| 2 | || PROJ: 20120605 |
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| 3 | || PART: G26CV12-#0007 |
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| 4 | || |
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| 5 | || DEV : GAL26CV12 |
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| 6 | || |
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| 7 | || DESC: DECODER MEMORIA DI SISTEMA |
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| 8 | || |
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| 9 | | |
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| 10 | |GAL26CV12 |
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| 11 | | |
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| 12 | || INPUT |
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| 13 | | 1:MA19, 2:MA20, 3:CS0, 4:CS2, 5:CS3, 6:CSF, 8:CX1, 9:PHI0, 10:RW, |
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| 14 | | 11:PHI2, 12:MW0, 13:-, 14:-, 28:CPU, |
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| 15 | || OUTPUT |
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| 16 | | 15:G, 16:CE0, 17:CE2, 18:CE3, 19:CEF, 20:WE, 22:RD, 23:CE4, |
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| 17 | | 24:CE5, 25:CE6, 26:CE7, 27:CE8 |
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| 18 | | |
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| 19 | | ACTIVE-LOW: G, CE0, CE2, CE3, CEF, WE, RD, CE4, CE5, CE6, CE7, CE8 |
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| 20 | | |
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| 21 | | |
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| 22 | | SIGNATURE: "0007 " |
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| 23 | | |
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| 24 | || |
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| 25 | || BUFFER 2MB - ABILITATO DA /CX1 |
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| 26 | | CE4 = (CX1' & PHI2 & MA20' & MA19') |
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| 27 | | CE5 = (CX1' & PHI2 & MA20' & MA19) |
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| 28 | | CE6 = (CX1' & PHI2 & MA20 & MA19') |
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| 29 | | CE7 = (CX1' & PHI2 & MA20 & MA19) |
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| 30 | || |
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| 31 | || RAM 512K PER CPU 8 BIT - ABILITATA DA /CS0 |
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| 32 | | CE8 = (CS0' & PHI2 & CPU') |
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| 33 | || |
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| 34 | || RAM 128K PER CPU 16 BIT - ABILITATA DA /CS0 |
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| 35 | | CE0 = (CS0' & PHI2 & CPU) |
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| 36 | || |
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| 37 | || RAM 128K - ABILITATE DA /CS2 e /CS3 |
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| 38 | | CE2 = (CS2' & PHI2) |
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| 39 | | CE3 = (CS3' & PHI2) |
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| 40 | || |
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| 41 | || FLASH 512K (16 bit) / 256K (8 bit - A18 = 0) ABILITATA DA /CSF |
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| 42 | | CEF = (CSF' & PHI2) |
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| 43 | || |
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| 44 | || BUFFER DATI |
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| 45 | | MS = (CS0' # CS2' # CS3' # CSF' # CX1') |
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| 46 | | G = MS |
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| 47 | || |
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| 48 | || READ & WRITE ENABLE |
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| 49 | | RD = (MS & PHI2 & RW) |
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| 50 | | WRA = (MS & PHI2 & RW' & MW0) |
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| 51 | | WRB = (MS & PHI0 & RW' & MW0') |
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| 52 | | WE = (WRA # WRB) |