Bus Configuration Registers
Writes to those registers marked as “Reserved” will have no effect. Reads from these locations will produce unde-
fined values.
Table 90. Bus Configuration Registers (BCRs)
Programmability
RAP
0
Mnemonic
MSRDA
MSWRA
MC
Default
0005h
0005h
0002h
N/A
Name
User
No
EEPROM
No
Reserved
Reserved
1
No
No
2
Miscellaneous Configuration
Reserved
Yes
No
Yes
No
3
Reserved
LED0
4
00C0h
0084h
0088h
0090h
N/A
LED0 Status
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
No
5
LED1
LED1 Status
6
LED2
LED2 Status
7
LED3
LED3 Status
8
Reserved
FDC
Reserved
9
0000h
N/A
Full-Duplex Control
Reserved
Yes
No
Yes
No
10-15
16
17
18
19
20
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Reserved
IOBASEL
IOBASEU
BSBC
N/A
Reserved
No
No
N/A
Reserved
No
No
9001h
0002h
0200h
FF06h
0000h
0000h
0000h
0000h
0000h
N/A
Burst and Bus Control
EEPROM Control and Status
Software Style
Yes
Yes
Yes
Yes
No
Yes
No
EECAS
SWS
No
PCILAT
PCISID
PCISVID
SRAMSIZ
SRAMB
SRAMIC
EBADDRL
EBADDRU
EBDR
PCI Latency
Yes
Yes
Yes
Yes
Yes
Yes
No
PCI Subsystem ID
PCI Subsystem Vendor ID
SRAM Size
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
SRAM Boundary
SRAM Interface Control
Expansion Bus Address Lower
Expansion Bus Address Upper
Expansion Bus Data Port
Software Timer Value
PHY Control and Status
PHY Address
N/A
No
N/A
No
STVAL
FFFFh
0000h
N/A
No
MIICAS
MIIADDR
MIIMDR
PCIVID
Yes
Yes
No
N/A
PHY Management Data
PCI Vendor ID
1022h
Yes
PCI Power Management Capabilities
(PMC) Alias Register
36
PMC_A
C811h
No
Yes
37
38
39
40
41
42
43
44
45
46
47
48
49
DATA0
DATA1
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
PMR1
0000h
0000h
0000h
0000h
0000h
0000h
0000h
0000h
N/A
PCI DATA Register Zero Alias Register
PCI DATA Register One Alias Register
PCI DATA Register Two Alias Register
PCI DATA Register Three Alias Register
PCI DATA Register Four Alias Register
PCI DATA Register Five Alias Register
PCI DATA Register Six Alias Register
PCI DATA Register Seven Alias Register
Pattern Matching Register 1
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
PMR2
N/A
Pattern Matching Register 2
No
PMR3
N/A
Pattern Matching Register 3
No
LED4
0082h
8000h
LED4 Status
Yes
Yes
PHY_SEL
PHY Select
212
Am79C978
AMD [ AMD ]
