Maxim DS33Z41 specifications MII Mode, Rmii Mode

Models: DS33Z41

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DS33Z41 Quad IMUX Ethernet Mapper

8.14.1 MII Mode

The Ethernet interface can be configured for MII operation by setting the hardware pin RMIIMIIS low. The MII interface consists of 17 pins. For instructions on clocking the Ethernet Interface while in MII mode, see Section 8.2.2. Diagrams of system connections for MII operation are shown in Figure 8-8 and Figure 8-9.

8.14.2 RMII Mode

The Ethernet interface can be configured for RMII operation by setting the hardware pin RMIIMIIS high. RMII interface operates synchronously from the external 50MHz reference (REF_CLK). Only 7 signals are required. The following figure shows the RMII architecture. Note that DCE mode is not supported for RMII mode and RMII is valid only for full duplex operation.

Figure 8-10. RMII Interface

MAC MII to RMII

TX_EN

TXD[3:0]

TX_ERR

TX_CLK

RX_CRS

RX_DV

RX_CRS

RX_CLK

TXD[1:0]

TX_EN

CRS_DV

RXD[1:0]

REF_CLK

PHY RMII to MII

TX_EN

TXD[3:0]

TX_ERR

TX_CLK

CRS

RX_DV

RXD[3:0]

RX_ER

RX_CLK

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Page 47
Image 47
Maxim DS33Z41 specifications MII Mode, Rmii Mode