am79c961 Advanced Micro Devices, am79c961 Datasheet - Page 84

• Manufacturer Part Number: am79c961
• Description: Pcnettm-isa Jumperless Single-chip Ethernet Controller For Isa
• Manufacturer: Advanced Micro Devices

1-558
CSR26-27: Next Receive Descriptor Address
Bit
31-24
23-0
CSR28-29: Current Receive Descriptor Address
Bit
31-24
23-0
CSR30-31: Base Address of Transmit Ring
Bit
31-24
23-0
CSR32-33: Next Transmit Descriptor Address
Bit
31-24
23-0
CSR34-35: Current Transmit Descriptor Address
Bit
31-24
23-0
AMD
NRDA
CRDA
BADX
NXDA
CXDA
Name
Name
Name
Name
Name
RES
RES
RES
RES
RES
Reserved locations. Written as
zero and read as undefined.
Contains the next RDRE address
pointer.
Read/write accessible only when
STOP bit is set.
Reserved locations. Written as
zero and read as undefined.
Contains the current RDRE ad-
dress pointer.
Read/write accessible only when
STOP bit is set.
Reserved locations. Written as
zero and read as undefined.
Contains the base address of the
Transmit Ring.
Read/write accessible only when
STOP bit is set.
Reserved locations. Written as
zero and read as undefined.
Contains the next TDRE address
pointer.
Read/write accessible only when
STOP bit is set.
Reserved locations. Written as
zero and read as undefined.
Contains the current TDRE ad-
dress pointer.
Read/write accessible only when
STOP bit is set.
Description
Description
Description
Description
Description
P R E L I M I N A R Y
Am79C961
CSR36-37: Next Next Receive Descriptor Address
Bit
31-0
CSR38-39: Next Next Transmit Descriptor Address
Bit
31-0
CSR40-41: Current Receive Status and Byte
Bit
31-24 CRST
23-12
11-0
CSR42-43: Current Transmit Status and Byte
Bit
31-24 CXST
23-12
11-0
NNRDA
NNXDA
CRBC
CXBC
Name
Name
Name
Name
RES
RES
Count
Count
Contains the next next RDRE ad-
dress pointer.
Read/write accessible only when
STOP bit is set.
Contains the next next TDRE ad-
dress pointer.
Read/write accessible only when
STOP bit is set.
Current Receive Status. This
field is a copy of bits 15:8 of
RMD1 of the current receive
descriptor.
Read/write accessible only when
STOP bit is set.
Reserved locations. Written as
zero and read as undefined.
Current Receive Byte Count.
This field is a copy of the BCNT
field of RMD2 of the current re-
ceive descriptor.
Read/write accessible only when
STOP bit is set.
Current Transmit Status. This
field is a copy of bits 15:8 of
TMD1 of the current transmit
descriptor.
Read/write accessible only when
STOP bit is set.
Reserved locations. Written as
zero and read as undefined.
Current Transmit Byte Count.
This field is a copy of the BCNT
field of TMD2 of the current trans-
mit descriptor.
Description
Description
Description
Description