Interphase Tech CONDOR 4221 User Manual
Page 95
MAC Control/Status
83
Table 3-26. Intel 82596 Receive Status / Control
Save bad frames (SB) (p. 4-129)
When set bad frames (CRC error, Alignment error, etc.) are sent to the host.
Broadcast disable (BD) (p. 4-134)
Disables reception of frames with a Broadcast destination address or Multicast of all 1’s.
Multicast all (MA) (p. 4-140)
Enables the 82596 to receive all frames that have a multicast address in the destination address fields.
Multicast setup (MS) (p. 4-141)
This command loads the 82596 with the Multicast-IDs that should be accepted. The filtering done on these
is not perfect, and some unwanted frames may be accepted. A list of addresses may be specified with the
Buffer Address field: the controller uses the default address length, combined with the Transfer Size parameter
to determine the number of addresses provided. Multicast filtering may be active with multiple individual
addresses: in this case the host will need to issue the command twice in order to provide both the list of
multicast addresses to filter, and the list of multiple individual addresses to filter.
Multiple individual address (MI) (p. 4-141)
Enables the 82596 to receive multiple individual address frames using the same hashing mechanism as used
for multicast address filtering. A list of addresses may be specified with the Buffer Address field: the controller
uses the default address length, combined with the Transfer Size parameter to determine the number of
addresses provided.
Address length (p. 4-129)
Determines the length, in bytes, of the addresses used by the 82596. These include Individual, Source,
Destination, Multicast, or Broadcast addresses. This value is used to determine the number of entries in any
provided list of addresses, either for Multicast or multiple individual address filtering.
Monitor mode (MONM) (p. 4-128)
Refer to the 82596 documentation for a full description of monitor functions.
Loopback (LPBK) (p. 4-130)
Configures the loopback operation of the 82596. Refer to the 82596 documentation for a full description of
the modes of operation.
Min frame length (p. 4-138)
Specifies the minimum received frame size, not including preamble (in bytes).
Intel 82596 Receive Status/Control
Offst
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x0E
LPBK
MONM
ADDR LEN
MI MS MA BD SB
0x0F
DG
DU TDR
Min Frame Length