AM79C973BKD AMD (ADVANCED MICRO DEVICES), AM79C973BKD Datasheet - Page 208

• Manufacturer Part Number: AM79C973BKD
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79C973BKD

• Lead Free Status / RoHS Status: Compliant

20
19-16 RES
15-12 ONES
11-0
208
BAM
BCNT
Broadcast Address Match is set
by the Am79C973/Am79C975
controller when it accepts the re-
ceived
frame’s destination address is of
the type ’Broadcast.’ BAM is valid
only when ENP is set. BAM is set
by the Am79C973/Am79C975
controller and cleared by the
host.
Reserved locations. These loca-
tions should be read and written
as zeros.
These four bits must be written as
ones. They are written by the host
and
Am79C973/Am79C975
ler.
Buffer Byte Count is the length of
the buffer pointed to by this de-
scriptor, expressed as the two’s
complement of the length of the
buffer. This field is written by the
host and unchanged by the
is programmed to use 16-bit soft-
ware structures for the descriptor
ring entries (BCR20, bits 7-0,
SWSTYLE is cleared to 0).
This bit does not exist when the
Am79C973/Am79C975 controller
is programmed to use 16-bit soft-
ware structures for the descriptor
ring entries (BCR20, bits 7-0,
SWSTYLE is cleared to 0).
unchanged
frame,
because
P R E L I M I N A R Y
by
Am79C973/Am79C975
control-
the
the
RMD2
Bit
31
30-16 RFRTAG
15-12 ZEROS
11-0
RMD3
Bit
31-0
ZERO
MCNT
US
Name
Name
This
Message Byte Count is the length
Am79C973/Am79C975
ler.
This
Am79C973/Am79C975 controller
will write a zero to this location.
Receive Frame Tag. Indicates
the Receive Frame Tag applied
from the EADI interface. This field
is user defined and has a default
value of all zeros. When RX-
FRTG (CSR7, bit 14) is set to 0,
RFRTAG will be read as all zeros.
See the section on Receive
Frame Tagging for details.
Am79C973/Am79C975 controller
will write zeros to these locations.
in bytes of the received message,
expressed as an unsigned binary
integer. MCNT is valid only when
ERR is clear and ENP is set.
MCNT
Am79C973/Am79C975 controller
and cleared by the host.
User Space. Reserved for user
defined space.
Description
Description
field
field
is
is
written
reserved.
is
reserved.
by
control-
The
the