I-2
BCR6
LED2 Status
BCR7
LED3 Status
BCR9
Full-Duplex Control
Bus Master DMA Transfers
157
160
163
37
C
Carrier Tracking and End of Message
Clock Acquisition
Collision Detection
Collision Handling
Compatible (with Am79C971 device)
10BASE-T Filters and Transformers
AUI Isolation Transformers
DC/DC Converters
Media Interface Modules
Control and Status Registers
CSR0
Am79C971 Controller Status and
Control Register
CSR1
Initialization Block Address 0
CSR10
Logical Address Filter 2
CSR100
Bus Timeout
CSR11
Logical Address Filter 3
CSR112
Missed Frame Count
CSR114
Receive Collision Count
CSR12
Physical Address Register 0
CSR122
Advanced Feature Control
CSR124
Test Register 1
CSR125
MAC Enhanced Configuration Control 147
CSR13
Physical Address Register 1
CSR14
Physical Address Register 2
CSR15
Mode
CSR16
Initialization Block Address Lower
CSR17
Initialization Block Address Upper
CSR18
Current Receive Buffer Address Lower 133
CSR19
Current Receive Buffer Address Upper 133
CSR2
71
71
72
63
A-1
A-2
A-2
A-1
115
–
148
115
118
129
146
129
147
147
129
147
147
130
130
130
133
133
Initialization Block Address 1
CSR20
Current Transmit Buffer Address Lower 133
CSR21
Current Transmit Buffer Address Upper 133
CSR22
Next Receive Buffer Address Lower
CSR23
Next Receive Buffer Address Upper
CSR24
Base Address of Receive Ring Lower
CSR25
Base Address of Receive Ring Upper
CSR26
Next Receive Descriptor Address Lower134
CSR27
Next Receive Descriptor Address Upper134
CSR28
Current Receive Descriptor Address
Lower
CSR29
Current Receive Descriptor Address
Upper
CSR3
Interrupt Masks and Deferral Control
CSR30
Base Address of Transmit Ring Lower 135
CSR31
Base Address of Transmit Ring Upper
CSR32
Next Transmit Descriptor Address Lower135
CSR33
Next Transmit Descriptor Address Upper135
CSR34
Current Transmit Descriptor Address Lower
118
134
134
134
134
134
135
118
135
135
CSR35
Current Transmit Descriptor Address
CSR36
Next Next Receive Descriptor Address
CSR37
Next Next Receive Descriptor Address
Upper
CSR38
Next Next Transmit Descriptor Address Lower
CSR39
Next Next Transmit Descriptor Address Upper
CSR4
Test and Features Control
CSR40
Current Receive Byte Count
CSR41
Current Receive Status
CSR42
135
136
136
136
136
121
136
136