ST STM32F40 Series Reference Manual page 988

RM0090
Bits 15:0 MACA1H: MAC address1 high [47:32]
Ethernet MAC address1 low register (ETH_MACA1LR)
Address offset: 0x004C
Reset value: 0xFFFF FFFF
The MAC address 1 low register holds the lower 32 bits of the 6-byte second MAC address
of the station.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:0 MACA1L: MAC address1 low [31:0]
Ethernet MAC address 2 high register (ETH_MACA2HR)
Address offset: 0x0050
Reset value: 0x0000 FFFF
The MAC address 2 high register holds the upper 16 bits of the 6-byte second MAC address
of the station.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
AE SA MBC
rw rw rw rw rw rw rw rw
Bit 31 AE: Address enable
Bit 30 SA: Source address
Bits 29:24 MBC: Mask byte control
– Bit 29: ETH_MACA2HR [15:8]
– Bit 28: ETH_MACA2HR [7:0]
– Bit 27: ETH_MACA2LR [31:24]
...
– Bit 24: ETH_MACA2LR [7:0]
Ethernet (ETH): media access control (MAC) with DMA controller
This field contains the upper 16 bits (47:32) of the 6-byte second MAC address.
This field contains the lower 32 bits of the 6-byte MAC address1. The content of this field is
undefined until loaded by the application after the initialization process.
Reserved
When this bit is set, the address filters use the MAC address2 for perfect filtering. When
reset, the address filters ignore the address for filtering.
When this bit is set, the MAC address 2 [47:0] is used for comparison with the SA fields of
the received frame.
When this bit is reset, the MAC address 2 [47:0] is used for comparison with the DA fields of
the received frame.
These bits are mask control bits for comparison of each of the MAC address2 bytes. When
set high, the MAC core does not compare the corresponding byte of received DA/SA with the
contents of the MAC address 2 registers. Each bit controls the masking of the bytes as
follows:
Doc ID 018909 Rev 4
MACA1L
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
9 8 7 6 5 4 3
9 8 7 6 5 4 3
MACA2H
2 1 0
2 1 0
988/1422