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LAN8700

±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWR™ in a Small Footprint

SMSC -> Microchip 

SIGNAL NAME

RX_CLK/

REGOFF

COL/

RMII/

CRS_DV

CRS/

PHYAD4

SIGNAL NAME

SPEED100/

PHYAD0

LINK/

PHYAD1

ACTIVITY/

PHYAD2

FDUPLEX/

PHYAD3

±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWRTM in a Small Footprint

Datasheet

Table 3.1 MII Signals (continued)

TYPE

I/O

I/O

I/O

DESCRIPTION

Receive Clock: 25MHz in 100Base-TX mode. 2.5MHz in

10Base-T mode.

Note: This signal is not used in RMII Mode

Regulator Off: Pulled up to VDDIO through a resistor at power

up event,(see Section 4.9, "Internal +1.8V Regulator Disable," on

page 30) will latch the internal 1.8v regulator off.

MII Mode Collision Detect: Asserted to indicate detection of

collision condition.

RMII – MII/RMII mode selection is latched on the rising edge of

the internal reset (nreset) based on the following strapping:

„ Float this pin for MII mode or pull-high with an external resistor

to VDDIO (see Table 4.3, “Boot Strapping Configuration

Resistors,” on page 32) to set the device in RMII mode.

„ See Section 4.6.3, "MII vs. RMII Configuration," on page 26 for

more details.

RMII Mode CRS_DV (Carrier Sense/Receive Data Valid)

Asserted to indicate when the receive medium is non-idle. When

a 10BT packet is received, CRS_DV is asserted, but RXD[1:0] is

held low until the SFD byte (10101011) is received. In 10BT, half-

duplex mode, transmitted data is not looped back onto the

receive data pins, per the RMII standard.

Carrier Sense: Indicates detection of carrier.

Note: This signal is mux’d with PHYAD4

Table 3.2 LED Signals

TYPE

I/O

I/O

I/O

I/O

DESCRIPTION

LED1 – SPEED100 indication. Active indicates that the selected

speed is 100Mbps. Inactive indicates that the selected speed is

10Mbps.

Note: This signal is mux’d with PHYAD0

LED2 – LINK ON indication. Active indicates that the Link

(100Base-TX or 10Base-T) is on.

Note: This signal is mux’d with PHYAD1

LED3 – ACTIVITY indication. Active indicates that there is

Carrier sense (CRS) from the active PMD.

Note: This signal is mux’d with PHYAD2

LED4 – DUPLEX indication. Active indicates that the PHY is in

full-duplex mode.

Note: This signal is mux’d with PHYAD3

Revision 1.0 (02-09-07)

14

DATASHEET

SMSC LAN8700/LAN8700I

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