am79c974 Advanced Micro Devices, am79c974 Datasheet - Page 116

• Manufacturer Part Number: am79c974
• Description: Pcnettm-scsi Combination Ethernet And Scsi Controller For Pci Systems
• Manufacturer: Advanced Micro Devices

Control and Status Registers (continued)
BCR—Bus Configuration Registers
Writes to those registers marked as “Reserved” will have no effect. Reads from these locations will produce undefined
values.
* Registers marked with an “*” have no default value, since they are not observable without first being programmed through the
116
EEPROM read operation. Therefore, the only observable values for these registers are those that have been programmed and
a default value is not applicable.
RAP Addr
BCR
8–15
AMD
16
17
18
19
20
21
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
0
1
2
3
4
5
6
7
MNEMONIC
IOBASEU
Reserved
Reserved
IOBASEL
MSWRA
INTCON
MSRDA
EECAS
LNKST
Symbol
BSBC
LED1
LED2
LED3
CSR108
CSR109
CSR110
CSR111
CSR112
CSR113
CSR114
CSR115
CSR116
CSR117
CSR118
CSR119
CSR120
CSR121
CSR122
CSR123
CSR124
CSR125
CSR126
CSR127
SWS
MC
Default Value
see reg. desc.
see reg. desc.
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu 0000
uuuu uuuu
uuuu 0000
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
H_RESET
Default
0005h
0005h
N/A*
N/A
00C0h
0084h
0088h
0090h
N/A
N/A*
N/A*
2101h
0002h
0000h
N/A*
After
P R E L I M I N A R Y
Reserved
Reserved
Reserved
Reserved
MFC: Missed Frame Count
Reserved
RCC: Receive Collision Count
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Receive Frame Alignment Control
Reserved
Test Register 1
Reserved
Reserved
Reserved
Description
Reserved
Reserved
Miscellaneous Configuration
Reserved
Link Status (Default)
Receive Status (Default)
Reserved
Transmit Status (Default)
Reserved
Reserved
Reserved
Burst Size and Bus Control
EEPROM Control and Status
Software Style
Reserved
Am79C974
Comments
User
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Programmability
EEPROM
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
Use
R
R
T
T
T
T
T
T
T
T
T
T
T
T
S
T
T
T
T
T