LAN9730 Datasheet, PDF (68/222 Pages) SMSC Corporation – High-Speed Inter-Chip (HSIC) USB 2.0

LAN9730/LAN9730i
The Filter i CRC-16 register contains the CRC-16 result of the frame that should pass Filter i.
Table 4-51 describes the Filter i CRC-16 bit fields.
TABLE 4-51: 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 pro-
grammed 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 4-52 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 4-52: WAKEUP GENERATION CASES
Filter
Enabled
(Note 4-20)
CRC
Match
(Note 4-21)
Global
Unicast
Enabled
(Note 4-22)
Yes
Yes
x
Yes
Yes
Yes
Yes
Yes
x
Yes
Yes
x
Yes
Yes
x
Pass
Regular
Receive
Filter
x
x
Yes
Yes
Yes
Address
Type
(Note 4-23)
Broad-
cast
Frame
(Note 4-24)
x
Yes
x
No
Multicast
No
(=10)
Unicast
No
(=00)
Passed
x
Receive
Filter
(=x1b)
Multicast
Frame
No
No
Yes
No
x
Unicast
Frame
No
Yes
No
Yes
x
Note 4-20
Note 4-21
Note 4-22
Note 4-23
Note 4-24
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 bits 3:2 of Filter i Command.
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 the Disable Broadcast Frames (BCAST) bit in the MAC Control Register (MAC_CR).
Note: x indicates “don’t care”.
DS00001946A-page 68
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