DS33Z11 Maxim Integrated Products, DS33Z11 Datasheet - Page 48

• Manufacturer Part Number: DS33Z11
• Description: Network Controller & Processor ICs Ethernet Mapper Ethe rnet-Serial TDM Ethe
• Manufacturer: Maxim Integrated Products

Specifications of DS33Z11

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.14.1 MII Mode Options
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 8.3. Diagrams of system connections for MII operation are shown in
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 50 MHz 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 8-7 RMII Interface
RX_CRS
RX_CRS
RX_CLK
TX_CLK
TX_ERR
TXD[3:0]
RX_DV
TX_EN
MAC MII to RMII
TXD[1:0]
TX_EN
REF_CLK
RXD[1:0]
CRS_DV
48 of 172
PHY RMII to MII
Figure 8-5
TXD[3:0]
TX_ERR
RXD[3:0]
TX_CLK
RX_DV
RX_ER
RX_CLK
CRS
and
TX_EN
Figure
8-6.