2 |
Board Level Hardware Description
The following table focuses on the Local I/O Devices portion of the local bus Main Memory Map.
Table 2-6. Local I/O Devices Memory Map
Address Range | Devices Accessed | Port Size | Size | Notes |
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$FFF00000 - $FFF3FFFF | Reserved | 256KB | 4 | |
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$FFF40000 - $FFF400FF | VMEchip2 (LCSR) | D32 | 256B | 1,3 |
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$FFF40100 - $FFF401FF | VMEchip2 (GCSR) | 256B | 1,3 | |
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$FFF40200 - $FFF40FFF | Reserved | 3.5KB | 4,6 | |
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$FFF41000 - $FFF41FFF | Reserved | 4KB | 4 | |
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$FFF42000 - $FFF42FFF | PCCchip2 | 4KB | 1 | |
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$FFF43000 - $FFF430FF | MEMC040/MCECC #1 | D8 | 256B | 1 |
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$FFF43100 - $FFF431FF | MEMC040/MCECC #2 | D8 | 256B | 1 |
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$FFF43200 - $FFF43FFF | MEMC040s/MCECCs | 3.5KB | 1,6 | |
| (repeated) |
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$FFF44000 - $FFF44FFF | reserved | 4KB | 4 | |
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$FFF45000 - $FFF451FF | CD2401 (Serial Comm. | 512B | 1 | |
| Cont.) |
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$FFF45200 - $FFF45DFF | Reserved | 3KB | 6,8 | |
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$FFF45E00 - $FFF45FFF | Reserved | 512B | 8 | |
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$FFF46000 - $FFF46FFF | 82596CA (LAN) | D32 | 4KB | 1,7 |
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$FFF47000 - $FFF47FFF | 53C710 (SCSI) | D32/D8 | 4KB | 1 |
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$FFF48000 - $FFF4FFFF | Reserved | 32KB | 4 | |
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$FFF50000 - $FFF6FFFF | Reserved | 128KB | 4 | |
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$FFF70000 - $FFF76FFF | Reserved | 28KB | 5 | |
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$FFF77000 - $FFF77FFF | CODE CMMU | D32 | 4KB | 1 |
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$FFF78000 - $FFF7EFFF | Reserved | 28KB | 5 | |
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$FFF7F000 - $FFF7FFFF | DATA CMMU | D32 | 4KB | 1 |
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$FFF80000 - $FFF9FFFF | Reserved | 128KB | 5 | |
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$FFFA0000 - $FFFBFFFF | Reserved | 128KB | 4 | |
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$FFFC0000 - $FFFCFFFF | MK48T08 (BBRAM, | 64KB | 1 | |
| TOD Clock) |
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$FFFD0000 - $FFFDFFFF | Reserved | 64KB | 4 | |
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$FFFE0007 | IACK LEVEL 1 | D8 | 1 byte | 2 |
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