lan9420 Standard Microsystems Corp., lan9420 Datasheet - Page 59

• Manufacturer Part Number: lan9420
• Description: Lan9420/lan9420i Single-chip Ethernet Controller With Hp Auto-mdix Support And Pci Interface
• Manufacturer: Standard Microsystems Corp.

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
SMSC LAN9420/LAN9420i
ENABLED
(Note
FILTER
BITS
BITS
15:0
7:0
Yes
Yes
Yes
Yes
3.2)
The Filter i CRC-16 register contains the CRC-16 result of the frame that should pass Filter i.
Table 3.18
Table 3.19
of the
Note 3.2
Note 3.3
Note 3.4
Note 3.5
Note: x indicates “don’t care”.
DESCRIPTION
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.
DESCRIPTION
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.
(Note
MATCH
CRC
Yes
Yes
Yes
Yes
Wakeup Control and Status Register (WUCSR)
3.3)
indicates the cases that produce a wake when the
describes the Filter i CRC-16 bit fields.
As determined by bit 0 of Filter i Command.
CRC matches Filter i CRC-16 field.
As determined by bit 9 of WUCSR.
As determined by bit 2 of Filter i Command.
ENABLED
UNICAST
(Note
GLOBAL
Yes
x
x
x
Table 3.18 Filter i CRC-16 Bit Definitions
3.4)
Table 3.17 Filter i Offset Bit Definitions
Table 3.19 Wakeup Generation Cases
FILTER i OFFSET DESCRIPTION
FILTER i CRC-16 DESCRIPTION
REGULAR
RECEIVE
FILTER
PASS
Yes
Yes
DATASHEET
x
x
59
ADDRESS
(Note
Multicast
Unicast
TYPE
(=1)
(=0)
x
x
3.5)
is set. All other cases do not generate a wake.
BROAD-
FRAME
Wakeup Frame Enable (WAKE_EN)
CAST
Yes
No
No
No
FRAME
MULTI-
CAST
Yes
No
No
No
Revision 1.1 (03-31-08)
UNICAST
FRAME
Yes
Yes
No
No
bit