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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | - | 1 | || FILE: #0056.PLD |
| 2 | || PROJ: 20120401 |
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| 3 | || PART: G26CV12-#0056 |
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| 4 | || |
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| 5 | || DEV : GAL26CV12 |
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| 6 | || |
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| 7 | || DESC: DECODER SCHEDE RAM 4Mb |
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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:A19, 2:A20, 3:A21, 4:A22, 5:A23, 6:PHI0, 8:RW, 9:ME, 10:PHI2, |
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| 14 | | 11:FE, 12:S0, 13:S1, 14:MW0, 28:LST, |
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| 15 | || OUTPUT |
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| 16 | | 15:CS0, 16:CS1, 17:CS2, 18:CS3, 19:RD, 20:WR, 22:G, |
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| 17 | | 23:CS4, 24:CS5, 25:CS6, 26:CS7, 27:CSF |
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| 18 | | |
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| 19 | | ACTIVE-LOW: CS0, CS1, CS2, CS3, CS4, CS5, CS6, CS7, RD, WR, G, CSF |
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| 20 | | |
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| 21 | | |
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| 22 | | SIGNATURE: "0056 " |
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| 23 | | |
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| 24 | || |
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| 25 | || -------------------------------------------------------- |
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| 26 | || S0, S1 -> SELEZIONE BLOCCO |
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| 27 | || /MW0 -> QUALIFICA WRITE CON PHI0 |
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| 28 | || /FE -> ABILITA FLASH F00000 - F7FFFF (512K) |
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| 29 | || /ME -> ABILITA RAM |
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| 30 | || LST -> ABILITA SLOT (CSF) PER FLASH |
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| 31 | || -------------------------------------------------------- |
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| 32 | || |
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| 33 | || BLOCCHI SELEZIONE RAM 4MB |
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| 34 | || BLK0 -> 000000 - 3FFFFF (S0 = 0, S1 = 0) |
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| 35 | | BLK0 = (A23' & A22' & S1' & S0' & ME' & FE) |
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| 36 | || BLK1 -> 400000 - 7FFFFF (S0 = 1, S1 = 0) |
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| 37 | | BLK1 = (A23' & A22 & S1' & S0 & ME' & FE) |
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| 38 | || BLK2 -> 800000 - BFFFFF (S0 = 0, S1 = 1) |
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| 39 | | BLK2 = (A23 & A22' & S1 & S0' & ME' & FE) |
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| 40 | || BLK3 -> C00000 - FFFFFF (S0 = 1, S1 = 1) |
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| 41 | | BLK3 = (A23 & A22 & S1 & S0 & ME' & FE) |
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| 42 | || BK3F -> C00000 - FFFFFF (S0 = 1, S1 = 1) FLASH (FE=0, LST=1) |
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| 43 | | BK3F = (A23 & A22 & S1 & S0 & ME & FE' & LST) |
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| 44 | | SLF = (BK3F & A21 & A20 & A19') |
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| 45 | || -------------------------------------------------------- |
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| 46 | || |
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| 47 | || SELEZIONE RAM |
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| 48 | | SLM = (BLK0 # BLK1 # BLK2 # BLK3) |
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| 49 | | SEL = (SLF # SLM) |
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| 50 | | CS0 = (SLM & A21' & A20' & A19' & PHI2) |
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| 51 | | CS1 = (SLM & A21' & A20' & A19 & PHI2) |
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| 52 | | CS2 = (SLM & A21' & A20 & A19' & PHI2) |
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| 53 | | CS3 = (SLM & A21' & A20 & A19 & PHI2) |
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| 54 | | CS4 = (SLM & A21 & A20' & A19' & PHI2) |
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| 55 | | CS5 = (SLM & A21 & A20' & A19 & PHI2) |
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| 56 | | CS6 = (SLM & A21 & A20 & A19' & PHI2) |
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| 57 | | CS7 = (SLM & A21 & A20 & A19 & PHI2) |
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| 58 | | G = SEL |
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| 59 | | CSF = (SLF & PHI2) |
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| 60 | | RD = (SEL & PHI2 & RW) |
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| 61 | | WRA = (SEL & PHI2 & RW' & MW0) |
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| 62 | | WRB = (SEL & PHI0 & RW' & MW0') |
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| 63 | | WR = (WRA # WRB) |