LAN8187_06 Datasheet, PDF(12/72 Page) SMSC Corporation – ±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWRTM

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LAN8187_06 Datasheet, PDF (12/72 Pages) SMSC Corporation – ±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWRTM

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Â±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWRTM

Datasheet

Chapter 3 Pin Description

This chapter describes the signals on each pin. When a lower case ânâ is used at the beginning of the

signal name, it indicates that the signal is active low. For example, nRST indicates that the reset signal

is active low.

3.1

I/O Signals

I Input. Digital LVCMOS levels.

O Output. Digital LVCMOS levels.

I/O Input or Output. Digital LVCMOS levels.

Note: The digital signals are not 5V tolerant. They are variable voltage from +1.6V to +3.6V.

AI Input. Analog levels.

AO Output. Analog levels.

Table 3.1 MII Signals

SIGNAL NAME

TXD0

TXD1

TXD2

TXD3

nINT/

TX_ER/

TXD4

TX_EN

TX_CLK

TYPE

I/O

DESCRIPTION

Transmit Data 0: Bit 0 of the 4 data bits that are accepted by

the PHY for transmission.

Transmit Data 1: Bit 1 of the 4 data bits that are accepted by

the PHY for transmission.

Transmit Data 2: Bit 2 of the 4 data bits that are accepted by

the PHY for transmission

Note: This signal should be grounded in RMII Mode.

Transmit Data 3: Bit 3 of the 4 data bits that are accepted by

the PHY for transmission.

Note: This signal should be grounded in RMII Mode

MII Transmit Error: When driven high, the 4B/5B encode

process substitutes the Transmit Error code-group (/H/) for the

encoded data word. This input is ignored in 10Base-T operation.

MII Transmit Data 4: In Symbol Interface (5B Decoding) mode,

this signal becomes the MII Transmit Data 4 line, the MSB of the

5-bit symbol code-group.

Notes:

Â This signal is not used in RMII Mode.

Â This signal is muxâd with nINT

Â See Section 4.10, "(TX_ER/TXD4)/nINT Strapping," on

page 31 for additional information on configuration/strapping

options.

Transmit Enable: Indicates that valid data is presented on the

TXD[3:0] signals, for transmission. In RMII Mode, only TXD[1:0]

have valid data.

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

10Base-T mode.

Note: This signal is not used in RMII Mode

SMSC LAN8187/LAN8187I

DATASHEET

Revision 1.0 (12-14-06)

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