LAN9500 Datasheet, PDF (62/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

LAN950x
TABLE 5-50: FILTER I COMMAND BIT DEFINITIONS
FILTER i COMMANDS
Bits
Description
3:2
Address Type: Defines the destination address type of the pattern.
00 = Pattern applies only to unicast frames.
10 = Pattern applies only to multicast frames.
X1 = Pattern applies to all frames that have passed the regular receive filter.
1
RESERVED
0
Enable Filter: When bit is set, Filter i is enabled, otherwise, Filter i is disabled.
The Filter i Offset register defines the offset in the frame’s destination address field from which the frames are examined
by Filter i. Table 5-51 describes the Filter i Offset bit fields.
TABLE 5-51: FILTER I OFFSET BIT DEFINITIONS
FILTER I OFFSET DESCRIPTION
Bits
Description
7:0
Pattern Offset: The offset of the first byte in the frame on which CRC is checked for Wakeup Frame
recognition. The MAC checks the first offset byte of the frame for CRC and checks to determine
whether the frame is a Wakeup Frame. Offset 0 is the first byte of the incoming frame's destination
address.
The Filter i CRC-16 register contains the CRC-16 result of the frame that should pass Filter i.
Table 5-52 describes the Filter i CRC-16 bit fields.
TABLE 5-52: FILTER I CRC-16 BIT DEFINITIONS
FILTER I CRC-16 DESCRIPTION
Bits
Description
15:0 Pattern CRC-16: This field contains the 16-bit CRC value from the pattern and the byte mask
programmed to the Wakeup Filter register function. This value is compared against the CRC
calculated on the incoming frame, and a match indicates the reception of a Wakeup Frame.
Table 5-53 indicates the cases that produce a wake when the Wakeup Frame Enable (WUEN) bit of the Wakeup Control
and Status Register (WUCSR) is set. All other cases do not generate a wake.
TABLE 5-53: WAKEUP GENERATION CASES
Filter
Enabled
(Note 5-21)
CRC Match
(Note 5-22)
Global
Unicast
Enabled
(Note 5-23)
Pass
Regular
Receive
Filter
Address
Type
(Note 5-24)
Yes
Yes
Yes
Yes
Yes
Note 5-21
Yes
x
x
x
Yes
Yes
x
x
Yes
x
Yes
Multicast
(=10)
Yes
x
Yes
Unicast
(=00)
Yes
x
Yes
Passed
Receive
Filter
(=x1b)
As determined by bit 0 of Filter i Command.
Note 5-22 CRC matches Filter i CRC-16 field.
Note 5-23 As determined by bit 9 of WUCSR.
Broad-cast
Frame
(Note 5-25)
Yes
No
No
No
x
Multi-cast
Frame
No
No
Yes
No
x
Unicast
Frame
No
Yes
No
Yes
x
DS00001875A-page 62
 2010 - 2015 Microchip Technology Inc.