Datasheet

TLK110
SLLS901D –DECEMBER 2011–REVISED JANUARY 2014 www.ti.com
2.4 10Mbs and 100Mbs PMD Interface
PIN
TYPE DESCRIPTION
NAME NO.
Differential common driver transmit output (PMD Output Pair): These differential outputs are
automatically configured to either 10Base-T or 100Base-TX signaling.
TD–, TD+ 16, 17 I/O
In Auto-MDIX mode of operation, this pair can be used as the Receive Input pair. These pins require 3.3V
bias for operation.
Differential receive input (PMD Input Pair): These differential inputs are automatically configured to
accept either 100Base-TX or 10Base-T signaling.
RD–, RD+ 13, 14 I/O
In Auto-MDIX mode of operation, this pair can be used as the Transmit Output pair. These pins require
3.3V bias for operation.
2.5 Clock Interface
PIN
TYPE DESCRIPTION
NAME NO.
CRYSTAL/OSCILLATOR INPUT:
MII reference clock: Reference clock. 25MHz ±50ppm-tolerance crystal reference or oscillator input. The
device supports either an external crystal resonator connected across pins XI and XO, or an external
XI 34 I
CMOS-level oscillator source connected to pin XI only.
RMII reference clock: Primary clock reference input for the RMII mode. The input must be connected to a
50MHz ±50ppm-tolerance CMOS-level oscillator source.
CRYSTAL OUTPUT: Reference Clock output. XO pin is used for crystal only. This pin should be left floating
XO 33 O
when an oscillator input is connected to XI.
CLOCK OUTPUT: In MII mode, this pin provides a 25 MHz clock output to the system. In RMII mode, this
CLKOUT 25 O pin provides a 50MHz clock output. This feature allows other devices to use the reference clock from the
TLK110 without requiring additional clock sources.
2.6 LED Interface
(See Table 3-3 for LED Mode Selection)
PIN
TYPE DESCRIPTION
NAME NO.
LED Pin to indicate status
Mode 1 LINK Indication LED: Indicates the status of the link. When the link is good, the LED
LED_LINK / is ON.
28 S, O, PU
AN_0
Mode 2 and ACT indication LED: Indicates transmit and receive activity in addition to the status
Mode 3 of the Link. The LED is ON when Link is good. The LED blinks when the transmitter
or receiver is active.
LED_SPEED / LED Pin to indicate the speed of the link. SPEED Indication LED indicates whether the link is
27 S, O, PU
AN_1 100Mb/s or 10Mb/s. The LED is ON when the link speed is 100Mbs and OFF when it is 10Mbs.
LED Pin to indicate status.
Mode 1 ACT indication LED: Indicates if there is any activity on the link. The LED is ON
LED_ACT /
(pulse) when activity is present on either Transmit or Receive channel.
26 S, O, PU
AN_EN
Mode 2 COL indication LED: Indicates collision detection.
Mode 3 may be programmed to DUPLEX Indication LED and indicates Full-duplex status.
2.7 JTAG Interface
PIN
TYPE DESCRIPTION
NAME NO.
JTAG_TCK 8 I, PU JTAG Test Clock: This pin has a weak internal pullup.
JTAG_TDI 12 I, PU JTAG Test Data Input: This pin has a weak internal pullup.
JTAG_TDO 9 O JTAG Test Data Output
6 Pin Descriptions Copyright © 2011–2014, Texas Instruments Incorporated
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