am79c961 Advanced Micro Devices, am79c961 Datasheet - Page 86

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

1-560
CSR56-57: Temporary Storage
Bit
31-0
CSR58-59: Temporary Storage
Bit
31-0
CSR60-61: Previous Transmit Descriptor Address
Bit
31-24
23-0
CSR62-63: Previous Transmit Status and Byte
Bit
31-24 PXST
23-12
11-0
AMD
PXDA
PXBC
TMP4
TMP5
Name
Name
Name
Name
RES
RES
Count
Temporary Storage location.
Read/write accessible only when
STOP bit is set.
Temporary Storage location.
Read/write accessible only when
STOP bit is set.
Reserved locations. Written as
zero and read as undefined.
Contains the previous TDRE ad-
dress pointer. The PCnet-ISA
controller has the capability to
stack multiple transmit frames.
Read/write accessible only when
STOP bit is set.
Previous Transmit Status. This
field is a copy of bits 15:8 of
TMD1 of the previous transmit
descriptor.
Read/write accessible only when
STOP bit is set.
Reserved locations. Written as
zero and read as undefined.
Accessible only when STOP bit is
set.
Previous Transmit Byte Count.
This field is a copy of the BCNT
field of TMD2 of the previous
transmit descriptor.
Read/write accessible only when
STOP bit is set.
Description
Description
Description
Description
P R E L I M I N A R Y
Am79C961
+
CSR64-65: Next Transmit Buffer Address
Bit
31-24
23-0
CSR66-67: Next Transmit Status and Byte Count
Bit
31-24 NXST
23-12
11-0
CSR68-69: Transmit Status Temporary Storage
Bit
31-0
CSR70-71: Temporary Storage
Bit
31-0
XSTMP
NXBC
NXBA
TMP8
Name
Name
Name
Name
RES
RES
Reserved locations. Written as
zero and read as undefined.
Contains the next transmit buffer
address
PCnet-ISA
mit an outgoing frame.
Read/write accessible only when
STOP bit is set.
Next Transmit Status. This field
is a copy of bits 15:8 of TMD1 of
the next transmit descriptor.
Read/write accessible only when
STOP bit is set.
Reserved locations. Written as
zero and read as undefined.
Accessible only when STOP bit is
set.
Next Transmit Byte Count. This
field is a copy of the BCNT field of
TMD2 of the next transmit
descriptor.
Read/write accessible only when
STOP bit is set.
Transmit Status Temporary Stor-
age location.
Read/write accessible only when
STOP bit is set.
Temporary Storage location.
Read/write accessible only when
STOP bit is set.
Description
Description
Description
Description
+
from
controller will trans-
which
the