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LAN8710A-EZC 데이터시트(PDF) 30 Page - SMSC Corporation

부품명 LAN8710A-EZC
상세설명  Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR Technology
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제조업체  SMSC [SMSC Corporation]
홈페이지  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN8710A-EZC 데이터시트(HTML) 30 Page - SMSC Corporation

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Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology
Datasheet
Revision 1.4 (08-23-12)
30
SMSC LAN8710A/LAN8710Ai
DATASHEET
3.4
MAC Interface
The MII/RMII block is responsible for communication with the MAC controller. Special sets of hand-
shake signals are used to indicate that valid received/transmitted data is present on the 4 bit
receive/transmit bus.
The device must be configured in MII or RMII mode. This is done by specific pin strapping
configurations. Refer to Section 3.4.3, "MII vs. RMII Configuration," on page 31 for information on pin
strapping and how the pins are mapped differently.
3.4.1
MII
The MII includes 16 interface signals:
transmit data - TXD[3:0]
transmit strobe - TXEN
transmit clock - TXCLK
transmit error - TXER/TXD4
receive data - RXD[3:0]
receive strobe - RXDV
receive clock - RXCLK
receive error - RXER/RXD4/PHYAD0
collision indication - COL
carrier sense - CRS
In MII mode, on the transmit path, the transceiver drives the transmit clock, TXCLK, to the controller.
The controller synchronizes the transmit data to the rising edge of TXCLK. The controller drives TXEN
high to indicate valid transmit data. The controller drives TXER high when a transmit error is detected.
On the receive path, the transceiver drives both the receive data, RXD[3:0], and the RXCLK signal.
The controller clocks in the receive data on the rising edge of RXCLK when the transceiver drives
RXDV high. The transceiver drives RXER high when a receive error is detected.
3.4.2
RMII
The device supports the low pin count Reduced Media Independent Interface (RMII) intended for use
between Ethernet transceivers and switch ASICs. Under IEEE 802.3, an MII comprised of 16 pins for
data and control is defined. In devices incorporating many MACs or transceiver interfaces such as
switches, the number of pins can add significant cost as the port counts increase. RMII reduces this
pin count while retaining a management interface (MDIO/MDC) that is identical to MII.
The RMII interface has the following characteristics:
It is capable of supporting 10Mbps and 100Mbps data rates
A single clock reference is used for both transmit and receive
It provides independent 2-bit (di-bit) wide transmit and receive data paths
It uses LVCMOS signal levels, compatible with common digital CMOS ASIC processes
The RMII includes the following interface signals (1 optional):
transmit data - TXD[1:0]
transmit strobe - TXEN
receive data - RXD[1:0]
receive error - RXER (Optional)


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