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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | - | 1 | || FILE: #0203.PLD |
| 2 | || PROJ: 20120601 |
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| 3 | || PART: G26CV12-#0203 |
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| 4 | || |
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| 5 | || DEV : GAL26CV12 |
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| 6 | || |
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| 7 | || DESC: MASTER DECODER - NEW BUS BOARD |
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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:A9, 2:A10, 3:A11, 4:A12, 5:A13, 6:A14, 8:A15, 9:A16, 10:A17, |
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| 14 | | 11:A18, 12:A19, 13:A20, 14:A21, 15:A22, 16:A23, 17:VMA, 18:HIM, |
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| 15 | | 25:SW0, 26:SW1, 27:S0, 28:S1, |
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| 16 | || OUTPUT |
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| 17 | | 19:CEE, 20:CS0, 22:CSR, 23:CSF, 24:CSE |
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| 18 | | |
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| 19 | | ACTIVE-LOW: CEE, CS0, CSR, CSF, CSE |
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| 20 | | |
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| 21 | | |
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| 22 | | SIGNATURE: "00203 " |
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| 23 | | |
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| 24 | || MAP |
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| 25 | || CS0 - RAM BANK $00 |
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| 26 | || CSR - RAM BANK $F0 |
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| 27 | || CSF - FLASH BANK $F0 |
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| 28 | || CSE - EEROM BANK $F0 |
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| 29 | || CEE - EMU8U BANK $F0 |
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| 30 | || |
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| 31 | || MAP $00FE00 - $00FFFF IF HIM = 0 |
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| 32 | || -------------------------------------- |
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| 33 | || SW0 SW1 TYPE SIGNAL |
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| 34 | || 0 X FLASH CSF |
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| 35 | || 1 0 EEROM CSE |
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| 36 | || 1 1 EMU8U CEE |
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| 37 | || |
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| 38 | || MAP $00FE00 - $00FFFF IF HIM = 1 |
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| 39 | || -------------------------------------- |
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| 40 | || SW0 SW1 TYPE SIGNAL |
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| 41 | || X X RAM BANK $00 CS0 |
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| 42 | || |
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| 43 | || MAP BANK $F0 : $F00000 - $F0FFFF |
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| 44 | || -------------------------------------- |
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| 45 | || S1 S0 TYPE SIGNAL |
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| 46 | || 0 0 RAM bank $F0 CSR |
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| 47 | || 0 1 FLASH CSF |
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| 48 | || 1 0 EEROM CSE |
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| 49 | || 1 1 EMU8U CEE |
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| 50 | || |
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| 51 | || -------------------------------------------------------- |
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| 52 | || |
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| 53 | || BANK $00 : $000000 - $00FFFF |
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| 54 | | BANK0 = (A23' & A22' & A21' & A20' & A19' & A18' & A17' & A16' & VMA') |
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| 55 | || |
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| 56 | || 32K BLOCK |
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| 57 | | RB0 = (BANK0 & A15' ) |
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| 58 | || 16K BLOCK |
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| 59 | | RB1 = (BANK0 & A15 & A14' ) |
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| 60 | || 8K BLOCK |
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| 61 | | RB2 = (BANK0 & A15 & A14 & A13' ) |
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| 62 | || 4K BLOCK |
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| 63 | | RB3 = (BANK0 & A15 & A14 & A13 & A12' ) |
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| 64 | || 2K BLOCK |
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| 65 | | RB4 = (BANK0 & A15 & A14 & A13 & A12 & A11' ) |
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| 66 | || 1K BLOCK |
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| 67 | | RB5 = (BANK0 & A15 & A14 & A13 & A12 & A11 & A10') |
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| 68 | || 512 BYTES BLOCK $00FC00 - $00FDFF RESERVED FOR I/O |
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| 69 | || RB6 = (BANK0 & A15 & A14 & A13 & A12 & A11 & A10 & A9') |
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| 70 | || |
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| 71 | || LAST 512 BYTES BLOCK ($00FE00 - $00FFFF) ONLY IF HIM=1 |
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| 72 | | RB7 = (BANK0 & A15 & A14 & A13 & A12 & A11 & A10 & A9 & HIM) |
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| 73 | || |
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| 74 | || BANK $00 RAM SELECT |
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| 75 | | CS0A = (RB0 # RB1 # RB2 # RB3 # RB4 # RB5 # RB7) |
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| 76 | || |
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| 77 | || BANK $01 : $010000 - $01FFFF |
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| 78 | | BANK1 = (A23' & A22' & A21' & A20' & A19' & A18' & A17' & A16 & VMA') |
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| 79 | || |
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| 80 | || 16K BLOCK $010000 - $013FFF RESERVED FOR EXTERNAL RAM |
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| 81 | || BR0 = (BANK1 & A15' & A14') |
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| 82 | || 16K BLOCK $014000 - $017FFF |
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| 83 | | BR1 = (BANK1 & A15' & A14) |
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| 84 | || 32K BLOCK $018000 - $01FFFF |
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| 85 | | BR2 = (BANK1 & A15) |
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| 86 | || |
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| 87 | || BANK $01 RAM SELECT |
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| 88 | | CS0B = (BR1 # BR2) |
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| 89 | || |
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| 90 | || BANK $02 & $03 : $020000 - $03FFFF (128K BLOK) |
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| 91 | | CS0C = (A23' & A22' & A21' & A20' & A19' & A18' & A17 & VMA') |
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| 92 | || |
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| 93 | || BANK $03 - $07 : $040000 - $07FFFF (256K BLOK) |
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| 94 | | CS0D = (A23' & A22' & A21' & A20' & A19' & A18 & VMA') |
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| 95 | || |
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| 96 | || BANK $00 - $07 RAM SELECTION (512K BLOCK) |
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| 97 | | CS0 = (CS0A # CS0B # CS0C # CS0D) |
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| 98 | || |
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| 99 | || -------------------------------------------------------- |
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| 100 | || |
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| 101 | || BANKF0: $F00000 - $F7FFFF |
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| 102 | | BANKF0 = (A23 & A22 & A21 & A20 & A19' & VMA') |
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| 103 | || |
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| 104 | || LAST 512 BYTES BLOCK ON BANK $00 ($00FE00 - $00FFFF) ONLY IF HIM=0 |
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| 105 | | BR7 = (BANK0 & A15 & A14 & A13 & A12 & A11 & A10 & A9 & HIM') |
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| 106 | || BR7 MAPPED TO FLASH IF SW0=0 |
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| 107 | | BR7F = BR7 & SW0' |
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| 108 | || BR7 MAPPED TO EEROM IF SW0=1 & SW1=1 |
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| 109 | | BR7E = BR7 & SW0 & SW1 |
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| 110 | || BR7 MAPPED TO EMU8U IF SW0=1 & SW1=0 |
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| 111 | | BR7U = BR7 & SW0 & SW1' |
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| 112 | || BANK $F0 MAPPED TO FLASH IF S0=1 & S1=0 |
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| 113 | | BF0F = BANKF0 & S0 & S1' |
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| 114 | || BANK $F0 MAPPED TO EEROM IF S0=0 & S1=1 |
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| 115 | | BF0E = BANKF0 & S0' & S1 |
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| 116 | || BANK $F0 MAPPED TO EMU8U IF S0=1 & S1=1 |
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| 117 | | BF0U = BANKF0 & S0 & S1 |
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| 118 | || BANK $F0 MAPPED TO RAM IF S0=0 & S1=0 |
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| 119 | | BF0R = BANKF0 & S0' & S1' |
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| 120 | | |
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| 121 | | CSR = BF0R |
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| 122 | | CSF = (BF0F # BR7F) |
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| 123 | | CSE = (BF0E # BR7E) |
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| 124 | | CEE = (BF0U # BR7U) |