212
Am79C978
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)
RAP
0
1
2
3
4
5
6
7
8
9
10-15
16
17
18
19
20
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Mnemonic
MSRDA
MSWRA
MC
Reserved
LED0
LED1
LED2
LED3
Reserved
FDC
Reserved
IOBASEL
IOBASEU
BSBC
EECAS
SWS
PCILAT
PCISID
PCISVID
SRAMSIZ
SRAMB
SRAMIC
EBADDRL
EBADDRU
EBDR
STVAL
MIICAS
MIIADDR
MIIMDR
PCIVID
Default
0005h
0005h
0002h
N/A
00C0h
0084h
0088h
0090h
N/A
0000h
N/A
N/A
N/A
9001h
0002h
0200h
FF06h
0000h
0000h
0000h
0000h
0000h
N/A
N/A
N/A
FFFFh
0000h
N/A
N/A
1022h
Name
Programmability
User
No
No
Yes
No
Yes
Yes
Yes
Yes
No
Yes
No
No
No
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
EEPROM
No
No
Yes
No
Yes
Yes
Yes
Yes
No
Yes
No
No
No
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
No
Yes
Reserved
Reserved
Miscellaneous Configuration
Reserved
LED0 Status
LED1 Status
LED2 Status
LED3 Status
Reserved
Full-Duplex Control
Reserved
Reserved
Reserved
Burst and Bus Control
EEPROM Control and Status
Software Style
PCI Latency
PCI Subsystem ID
PCI Subsystem Vendor ID
SRAM Size
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
PHY Management Data
PCI Vendor ID
PCI Power Management Capabilities
(PMC) Alias Register
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
Pattern Matching Register 2
Pattern Matching Register 3
LED4 Status
PHY Select
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
PMR2
PMR3
LED4
PHY_SEL
0000h
0000h
0000h
0000h
0000h
0000h
0000h
0000h
N/A
N/A
N/A
0082h
8000h
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes