Specifications

3-6 CPU Module
Table 3-1 Directly Addressable Console Hardware
3.3 CPU Module Address Space
DECchip 21164 supports one terabyte (40 bits) of address space divided
into two equal portions: memory space and I/O space. Figure 3-2 shows the
physical address space map of the CPU module.
Figure 3-2 Physical Address Space Map
DECchip 21164 drives a physical address over ADDR<39:4>. Bit <5>
specifies the first 32-byte subblock to be returned to the DECchip 21164
Console Hardware Address
FEPROM
FEPROM
Reserved
Reserved
UART chip
Watch chip
GBUS$WHAMI
GBUS$LED0
GBUS$LED1
GBUS$LED2
GBUS$MISCR
GBUS$MISCW
GBUS$TLSBRST
GBUS$SERNUM
GBUS$TEST
FF 9000 0000 - FF 93FF FFC0
FF 9400 0000 - FF 97FF FFC0
FF 9800 0000 - FF 9BFF FFC0
FF 9C00 0000 - FF 9FFF FFC0
FF A000 0000 - FF A100 00C0
FF B000 0000 - FF B000 0FC0
FF C000 0000
FF C100 0000
FF C200 0000
FF C300 0000
FF C400 0000
FF C500 0000
FF C600 0000
FF C700 0000
FF C800 0000
Byte Address
00 0000 0000

7F FFFF FFC0
80 0000 0000

DF FFFF FFC0
E0 0000 0000

FF 7FFF FFC0
FF 8000 0000

FF 8FFF FFC0
FF 9000 0000

FF EFFF FFC0
FF F000 0000

FF FFEF FFC0
FF FFF0 0000

FF FFFF FFC0


Memory Space
I/O Window Space
Reserved
DECchip 21164A Private CSR Space
Reserved
BXB-0781A-94
TLSB CSR Space
CPU Module Gbus Space