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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
837 of 1441
NXP Semiconductors
UM10503
Chapter 28: LPC43xx/LPC43Sxx Ethernet
If the MAC address registers are configured to be double-synchronized to the MII clock
domains, then the synchronization is triggered only when Bits[31:24] (in Little-Endian
mode) or Bits[7:0] (in Big-Endian mode) of the MAC Address Low Register are written to.
Please note that consecutive writes to this Address Low Register should be performed
only after at least 4 clock cycles in the destination clock domain for proper synchronization
updates.
28.6.15 MAC Address 0 low register
The MAC Address 0 Low register holds the lower 32 bits of the 6-byte first MAC address
of the station.
28.6.16 MAC IEEE1588 time stamp control register
This register controls the operation of the System Time generator and the snooping of
PTP packets for time-stamping in the Receiver.
Table 616. MAC Address 0 high register (MAC_ADDR0_HIGH, address 0x4001 0040) bit
description
Bit
Symbol
Description
Reset
value
Access
15:0
A47_32
MAC Address0 [47:32]
This field contains the upper 16 bits (47:32) of the 6-byte
first MAC address. This is used by the MAC for filtering for
received frames and for inserting the MAC address in the
Transmit Flow Control (PAUSE) Frames.
0xFFFF R/W
30:16
-
Reserved
0x0000
RO
31
MO
Always 1
1
RO
Table 617. MAC Address 0 low register (MAC_ADDR0_LOW, address 0x4001 0044) bit
description
Bit
Symbol
Description
Reset
value
Access
31:0
A31_0
MAC Address0 [31:0]
This field contains the lower 32 bits of the 6-byte first
MAC address. This is used by the MAC for filtering for
received frames and for inserting the MAC address in
the Transmit Flow Control (PAUSE) Frames.
0xFFFF
FFFF
R/W