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AM79C970 Datasheet(PDF) 133 Page - Advanced Micro Devices

Part # AM79C970
Description  PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
PDF  168 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C970 Datasheet(HTML) 133 Page - Advanced Micro Devices

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AMD
P R E L I M I N A R Y
1-1000
Am79C970
Control and Status Registers (continued)
Default Value
After
RAP Addr
Symbol
H_RESET
Comments
Use
108
CSR108
uuuu uuuu
Reserved
T
109
CSR109
uuuu uuuu
Reserved
T
110
CSR110
uuuu uuuu
Reserved
T
111
CSR111
uuuu uuuu
Reserved
T
112
CSR112
uuuu 0000
MFC: Missed Frame Count
R
113
CSR113
uuuu uuuu
Reserved
T
114
CSR114
uuuu 0000
RCC: Receive Collision Count
R
115
CSR115
uuuu uuuu
Reserved
T
116
CSR116
uuuu uuuu
Reserved
T
117
CSR117
uuuu uuuu
Reserved
T
118
CSR118
uuuu uuuu
Reserved
T
119
CSR119
uuuu uuuu
Reserved
T
120
CSR120
uuuu uuuu
Reserved
T
121
CSR121
uuuu uuuu
Reserved
T
122
CSR122
see reg. desc.
Receive Frame Alignment Control
S
123
CSR123
uuuu uuuu
Reserved
T
124
CSR124
see reg. desc.
Test Register 1
T
125
CSR125
uuuu uuuu
Reserved
T
126
CSR126
uuuu uuuu
Reserved
T
127
CSR127
uuuu uuuu
Reserved
T
BCR—Bus Configuration Registers
Writes to those registers marked as “Reserved” will
have no effect. Reads from these locations will produce
undefined values.
BCR
MNEMONIC
Default
Description
User
EEPROM
0
MSRDA
0005h
Reserved
No
No
1
MSWRA
0005h
Reserved
No
No
2
MC
N/A*
Miscellaneous Configuration
Yes
Yes
3
Reserved
N/A
Reserved
No
No
4
LNKST
00C0h
Link Status (Default)
Yes
No
5
LED1
0084h
Receive Status (Default)
Yes
No
6
LED2
0088h
Reserved
Yes
No
7
LED3
0090h
Transmit Status (Default)
Yes
No
8–15
Reserved
N/A
Reserved
No
No
16
IOBASEL
N/A*
Reserved
Yes
Yes
17
IOBASEU
N/A*
Reserved
Yes
Yes
18
BSBC
2101h
Burst Size and Bus Control
Yes
Yes
19
EECAS
0002h
EEPROM Control and Status
Yes
No
20
SWS
0000h
Software Style
Yes
No
21
INTCON
N/A*
Reserved
Yes
Yes
Programmability
* Registers marked with an “*” have no default value, since they are not observable without first being programmed through the
EEPROM read operation. Therefore, the only observable values for these registers are those that have been programmed and
a default value is not applicable.



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