LAN9500 Datasheet, PDF (160/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

LAN950x
Bits
Description
13 Hash/Perfect Filtering Mode (HPFILT)
When reset (0), the device will implement a perfect address filter on incoming
frames, according the address specified in the MAC address register.
When set (1), the address check function does imperfect address filtering of
multicast incoming frames according to the hash table specified in the
multicast hash table register.
If the Hash Only Filtering mode (HO) bit is set (1), then the physical (IA) are
imperfect filtered too. If the Hash Only Filtering mode (HO) bit is reset (0),
then the IA addresses are perfect address filtered according to the MAC
Address register
12 Late Collision Control (LCOLL)
When set, enables retransmission of the collided frame even after the
collision period (late collision). When reset, the MAC disables frame
transmission on a late collision. In any case, the Late Collision status is
appropriately updated in the Transmit Packet status.
11 Disable Broadcast Frames (BCAST)
When set, disables the reception of broadcast frames. When reset, forwards
all broadcast frames to the application.
Note:
When wakeup frame detection is enabled via the Wakeup Frame
Enable (WUEN) bit of the Wakeup Control and Status Register
(WUCSR), a broadcast wakeup frame will wake up the device
despite the state of this bit.
10 Disable Retry (DISRTY)
When set, the MAC attempts only one transmission. When a collision is seen
on the bus, the MAC ignores the current frame and goes to the next frame
and a retry error is reported in the Transmit status. When reset, the MAC
attempts 16 transmissions before signaling a retry error.
9 RESERVED
8 Automatic Pad Stripping (PADSTR)
When set, the MAC strips the pad field on all incoming frames, if the length
field is less than 46 bytes. The FCS field is also stripped, since it is computed
at the transmitting station based on the data and pad field characters, and is
invalid for a received frame that has had the pad characters stripped.
Receive frames with a 46-byte or greater length field are passed to the
Application unmodified (FCS is not stripped). When reset, the MAC passes
all incoming frames to system memory unmodified.
Type
R/W
R/W
R/W
R/W
RO
R/W
Default
0b
0b
0b
0b
-
0b
DS00001875A-page 160
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