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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
826 of 1441
NXP Semiconductors
UM10503
Chapter 28: LPC43xx/LPC43Sxx Ethernet
28.6.2 MAC Frame filter register
The MAC Frame Filter register contains the filter controls for receiving frames. Some of
the controls from this register go to the address check block of the MAC, which performs
the first level of address filtering. The second level of filtering is performed on the
incoming frame, based on other controls such as Pass Bad Frames and Pass Control
Frames.
If the hash table filter is enabled for unicast or multicast, then the perfect filter is disabled
unless bit 10 is set in this register.
See
for examples of how to configure the hash filter.
22
JD
Jabber Disable
When this bit is set, the MAC disables the jabber timer on the transmitter, and can
transfer frames of up to 16,384 bytes.
When this bit is reset, the MAC cuts off the transmitter if the application sends out
more than 2,048 bytes of data (10,240 if JE is set high) during transmission.
0
R/W
23
WD
Watchdog Disable
When this bit is set, the MAC disables the watchdog timer on the receiver, and can
receive frames of up to 16,384 bytes.
When this bit is reset, the MAC allows no more than 2,048 bytes (10,240 if JE is set
high) of the frame being received and cuts off any bytes received after that.
0
R/W
31:24
-
Reserved.
0x00
RO
Table 602. MAC Configuration register (MAC_CONFIG, address 0x4001 0000) bit description
…continued
Bit
Symbol
Description
Reset
value
Access
Table 603. MAC Frame filter register (MAC_FRAME_FILTER, address 0x4001 0004) bit description
Bit
Symbol
Description
Reset
value
Access
0
PR
Promiscuous Mode
When this bit is set, the Address Filter module passes all incoming frames regardless
of its destination or source address. The SA/DA Filter Fails status bits of the Receive
Status Word will always be cleared when PR is set.
0
R/W
1
HUC
Hash Unicast
When set, MAC performs destination address filtering of unicast frames according to
the hash table. When reset, the MAC performs a perfect destination address filtering
for unicast frames, that is, it compares the DA field with the values programmed in DA
registers.
0
R/W
2
HMC
Hash Multicast
When set, MAC performs destination address filtering of received multicast frames
according to the hash table. When reset, the MAC performs a perfect destination
address filtering for multicast frames, that is, it compares the DA field with the values
programmed in DA registers.
0
R/W
3
DAIF
DA Inverse Filtering
When this bit is set, the Address Check block operates in inverse filtering mode for
the DA address comparison for both unicast and multicast frames.
When reset, normal filtering of frames is performed.
0
R/W