Ethernet

The WPCM450 contains two instances of Winbond's own Ethernet MAC controller (EMC). It has also been used in other Winbond/Nuvoton SoCs.

Instance	MMIO	RX IRQ	TX IRQ	reset	clock enable
1	0xb0002000	15	16	6	6
2	0xb0003000	17	18	7	7

Although the register layout and theory of operation appears to the the same for EMC instances in different SoCs (W90N745, WPCM450, NPCM750), there are differences in SoC integration (reset lines, interrupt lines, clocks, MMIO addresses).

DMA address space

start	end	description
0x00000000	0x20000000	RAM
0x80000000	0xa0000000	RAM mirror

MMIO registers or internal SRAMs are not visible from the EMC.

References

• drivers: AMI (header with register definitions), OpenBMC
• Winbond W90N745 datasheet