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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
830 of 1441
NXP Semiconductors
UM10503
Chapter 28: LPC43xx/LPC43Sxx Ethernet
28.6.6 MAC MII Data register
The MII Data register stores Write data to be written to the PHY register located at the
address specified in the MAC_MII_ADDR register. This register also stores Read data
from the PHY register located at the address specified by the MAC_MII_ADDR register.
28.6.7 MAC Flow control register
The Flow Control register controls the generation and reception of the Control (Pause
Command) frames by the MAC’s Flow control module. A Write to a register with the Busy
bit set to 1 triggers the Flow Control block to generate a Pause Control frame. The fields
of the control frame are selected as specified in the 802.3x specification, and the Pause
Time value from this register is used in the Pause Time field of the control frame. The
Busy bit remains set until the control frame is transferred onto the cable. The Host must
make sure that the Busy bit is cleared before writing to the register.
1010
-
CLK_M4_ETHERNET/16
1011
-
CLK_M4_ETHERNET/26
1100
-
CLK_M4_ETHERNET/102
1101
-
CLK_M4_ETHERNET/124
1110
-
CLK_M4_ETHERNET/42
1111
-
CLK_M4_ETHERNET/62
Table 607. CSR clock range values
Bits 5:2
CLK_M4_ETHERNET
MDC clock
Table 608. MII Data register (MAC_MII_DATA, address 0x4001 0014) bit description
Bit
Symbol
Description
Reset
value
Access
15:0
GD
MII data
This contains the 16-bit data value read from the PHY after a
Management Read operation or the 16-bit data value to be
written to the PHY before a Management Write operation.
0
R/W
31:16
-
Reserved
0
RO