Mac Frame Reception; Figure 327. Transmission With Collision; Figure 328. Frame Transmission In Mmi And Rmii Modes - ST STM32F205 series Reference Manual

Advanced arm-based 32-bit mcus

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MII_TXD[3:0]

MII_TXD[3:0]

RMII_REF_CLK

RMII_TXD[1:0]

MAC frame reception

The MAC received frames are pushes into the Rx FIFO. The status (fill level) of this FIFO is

indicated to the DMA once it crosses the configured receive threshold (RTC in the

ETH_DMAOMR register) so that the DMA can initiate pre-configured burst transfers

towards the AHB interface.

In the default Cut-through mode, when 64 bytes (configured with the RTC bits in the

ETH_DMAOMR register) or a full packet of data are received into the FIFO, the data are

popped out and the DMA is notified of its availability. Once the DMA has initiated the

transfer to the AHB interface, the data transfer continues from the FIFO until a complete

Ethernet (ETH): media access control (MAC) with DMA controller

shows a frame transmission in MII and RMII.

RM0033 Rev 8

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