lan83c175 Standard Microsystems Corp., lan83c175 Datasheet - Page 64

• Manufacturer Part Number: lan83c175
• Description: Ethernet Cardbus Integrated Controller With Modem Support Corporation
• Manufacturer: Standard Microsystems Corp.

Access to the external modem is made
through accesses by the host to the EPIC/C.
The CardBus configuration space for the
modem function must be setup during card
initialization.
memory space writes or reads on the CardBus
to these defined spaces will be passed to the
modem or its register space. Accesses to the
modem I/O address space are defined in
Table 3, with dword addresses shown. Note
that accesses to the physical modem read and
write addresses physically found in the
modem, such as the transmit and receive
FIFO’s.
located in the EPIC/C.
00
04
08
0C
10
14
18
1C
20
24
28
2C
30
34
38
3C
byte addressed)
The other registers are physically
(must be
Physical
Address
Modem
Space
Once this is done, I/O or
Modem and External Flash RAM Interface and Control
40
44
48
4C
50
54
58
5C
60
64
68
6C
70
74
78
7C
Table 4 - Modem I/O Address Space
addressed)
Modem Registers Map
(must be
Physical
Address
Modem
Space
byte
64
I/O accesses to dword addresses 00-7C are
passed to the modem itself on a byte addressed
basis. For example, if a read access has the I/O
base address register, with bit CAD(7) equal to ‘0’,
bits CAD(6:0) are passed directly to the modem.
A modem, typically, will only use 3-6 address
lines, but the EPIC/C can accommodate up to 128
byte addresses to the physical modem in the
EPIC/C’s I/O space.
Accesses to dword addresses 80-94 will return the
registers shown in Table and defined later in the
document.
Access to the external RAM is through the 64K
byte configuration space defined in the Expansion
ROM Base Address.
80
84
88
8C
90
94
98
9C
A0
A4
A8
AC
B0
B4
B8
BC
NVCTL_m
STATUS_m
FEVTR
FEVTRMSKR
FPRSTSTR
FFRCEVTR
Unused
C0
C4
C8
CC
D0
D4
D8
DC
E0
E4
E8
EC
F0
F4
F8
FC
Unused