lan8187 Standard Microsystems Corp., lan8187 Datasheet - Page 12

• Manufacturer Part Number: lan8187
• Description: Lan8187/lan8187i ?15kv Esd Protected Mii/rmii 10/100 Ethernet Transceiver With Hp Auto-mdix & Flexpwr Technology
• Manufacturer: Standard Microsystems Corp.

Chapter 3 Pin Description
Revision 1.5 (01-10-08)
3.1
SIGNAL NAME
I/O Signals
This chapter describes the signals on each pin. When a lower case “n” 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.
I
O
I/O
Note: The digital signals are not 5V tolerant. They are variable voltage from +1.6V to +3.6V.
AI
AO
TX_CLK
TX_ER/
TX_EN
TXD0
TXD1
TXD2
TXD3
TXD4
nINT/
Input. Digital LVCMOS levels.
Output. Digital LVCMOS levels.
Input or Output. Digital LVCMOS levels.
Input. Analog levels.
Output. Analog levels.
TYPE
I/O
O
I
I
I
I
I
±15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX & flexPWR
Table 3.1 MII Signals
DATASHEET
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:
Transmit Data 3: Bit 3 of the 4 data bits that are accepted by
the PHY for transmission.
Note:
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:
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.
This signal is mux’d with nINT
See
page 32
options.
Section 4.10, "(TX_ER/TXD4)/nINT Strapping," on
12
This signal should be grounded in RMII Mode.
This signal should be grounded in RMII Mode
This signal is not used in RMII Mode
for additional information on configuration/strapping
DESCRIPTION
SMSC LAN8187/LAN8187i
TM
Datasheet
Technology