AMD
P R E L I M I N A R Y
1-964
Am79C970
Read/write accessible only when
STOP bit is set. These bits are
unaffected
by
S_RESET or STOP.
H_RESET,
CSR24: Base Address of Receive Ring Lower
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Contains the lower 16 bits of the
base address of the Receive
Ring.
Read/write accessible only when
STOP bit is set. These bits are
unaffected
by
S_RESET or STOP.
15–0
BADRL
H_RESET,
CSR25: Base Address of Receive Ring Upper
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Contains the upper 16 bits of the
base address of the Receive
Ring.
Read/write accessible only when
STOP bit is set. These bits are
unaffected
by
S_RESET or STOP.
15–0 BADRU
H_RESET,
CSR26: Next Receive Descriptor Address Lower
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Contains the lower 16 bits of the
next RDRE address pointer.
Read/write accessible only when
STOP bit is set. These bits are
unaffected
by
S_RESET or STOP.
15–0
NRDAL
H_RESET,
CSR27: Next Receive Descriptor Address Upper
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Contains the upper 16 bits of the
next RDRE address pointer.
Read/write accessible only when
STOP bit is set. These bits are
unaffected
by
S_RESET or STOP.
15–0 NRDAU
H_RESET,
CSR28: Current Receive Descriptor
Address Lower
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Contains the lower 16 bits of the
current RDRE address pointer.
Read/write accessible only when
STOP bit is set. These bits are
unaffected
by
S_RESET or STOP.
15–0
CRDAL
H_RESET,
CSR29: Current Receive Descriptor
Address Upper
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Contains the upper 16 bits of the
current RDRE address pointer.
Read/write accessible only when
STOP bit is set. These bits are
unaffected
by
S_RESET or STOP.
15–0 CRDAU
H_RESET,
CSR30: Base Address of Transmit Ring Lower
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Contains the lower 16 bits of the
base address of the Transmit
Ring.
Read/write accessible only when
STOP bit is set. These bits are
unaffected
by
S_RESET or STOP.
15–0
BADXL
H_RESET,
CSR31: Base Address of Transmit Ring Upper
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Contains the upper 16 bits of the
base address of the Transmit
Ring.
Read/write accessible only when
STOP bit is set. These bits are
unaffected
by
S_RESET or STOP.
15–0 BADXU
H_RESET,