AT&T 3B2/300 Technical Reference Manual page 532

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Address Spectrum
Figure 3-86 lists the board addresses for the main circuits on the MPE card.
ADDRESS DESCRIPTION
SIZE
(BYTES)
OxOOOOOOOO-OxOOOOlFFF SRAM
BK
Ox00010000-0x0001004B CSR 128
Ox00014000 ID REGISTER 1
Ox0004FOOO-Ox0004FFFF MMU 4K
Ox02000000-0x11FFFFFF MAINS TORE 256M
OxCOFOOOOO-OxCOFFFFFF RESERVED lM
OxFFFFFFFC-OxFFFFFFFF DGN. RESERVED 1 word
Figure 3-86: CM527 A MPE Card Address Map
ID/Vector Register
The CM527 A Card ID /Vector Register is a 16-bit register that is used for two functions. The
CM527 A Card ID code is Ox ffOO. Initially the register contains the lower byte (OxOO) of the CM527 A
Card ID code. The Oxff is supplied by firmware. Later the register contains an 8-bit interrupt vector for
the ID code. During system self-configuration, the system board CPU polls each feature card slot. This
polling reads the ID/Vector Register. The two bytes of the ID/Vector Register form a unique 16-bit ID
code of the card.
FUNCTIONAL DESCRIPTION 3-279