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RM0090: Reference manual - STMicroelectronics

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<strong>RM0090</strong> Ethernet (ETH): media access control (MAC) with DMA controller<br />

UDP or ICMP header is not modified. For the second error type, still, the calculated<br />

checksum is inserted into the corresponding header field.<br />

MII/RMII transmit bit order<br />

Each nibble from the MII is transmitted on the RMII a dibit at a time with the order of dibit<br />

transmission shown in Figure 332. Lower order bits (D1 and D0) are transmitted first<br />

followed by higher order bits (D2 and D3).<br />

Figure 332. Transmission bit order<br />

MII/RMII transmit timing diagrams<br />

Figure 333. Transmission with no collision<br />

MII_TX_CLK<br />

MII_TX_EN<br />

LSB<br />

MII_TXD[3:0]<br />

MSB<br />

D0<br />

D1<br />

D2<br />

D3<br />

MII_TXD[3:0] PR EA MB LE<br />

MII_CS<br />

MII_COL<br />

Low<br />

RMII_TXD[1:0]<br />

LSB MSB<br />

D0 D1<br />

Bibit stream<br />

Nibble stream ai15632<br />

ai15631<br />

Doc ID 018909 Rev 3 920/1416

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