82551QM Datasheet, PDF (82/120 Pages) Intel Corporation – Fast Ethernet Multifunction PCI/CardBus Controller

82551QM — Networking Silicon
10.3.1
10.3.2
10.3.3
10.3.3.1
Modem Base Memory Addressing
The modem base memory addressing is an 8-byte address space. There are three types of address
spaces:
1. Modem chipset address space: 0h to Fh
2. Modem function address space: 80h to FFh (implemented in 82551QM)
3. Modem CIS address space: 100h to 1FFh (loaded from EEPROM)
Table 38. Modem Based Memory Address Registers
Byte Offset
0h:7h
8h:Fh
80h:83h
E0h:E3h
F0h:F3h
F4h:F7h
F8h:FBh
FCh:FFh
100h:1FFh
Register Description
Modem controller mimic port, ISA address space 0:7
Modem controller Resource Management Port (RMP), ISA
address space 8:15
Modem Control Register: Reset[0], Central Site Mode[1]
Reserved
Modem Function Event Register
Modem Function Mask Register
Modem Function Present Register
Modem Force Function Event Register
CIS Area (loaded from the EEPROM)
Modem Base I/O Addressing
The modem base I/O addressing is an 8-byte address space. During I/O cycles, accesses to the
modem port are byte accesses. FLA3 is kept low while FLA2:0 are mapped according to the PCI
byte address offset.
Table 39. Modem Based I/O Address Registers
Byte Offset
0h:7h
Register Description
Venus MIMIC port, ISA address space 7:0.
Modem CardBus CSTCHG Registers
The modem CardBus CSTCHG registers are used in CardBus mode only. There are four event
related registers. The CardBus software uses the registers to determine which event has occurred
and manage the event and to control the CSTSCHG signal. The 82551QM supports only the
interrupt and general wake-up event bits in the CSTSCHG registers. These registers complement
the PCI Power Management registers and are used with non-ACPI compliant OS. It is initialized by
power-up reset driven on the ALTRST# pin.
Modem Function Event Register
The Modem Function Event register specifies the event that changed its status. It is identical to the
Ethernet Function Event register described in Section 10.1.13.1, “LAN Function Event Register”.
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Datasheet