TLK110 Datasheet, PDF (6/104 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer

TLK110
SLLS901A – DECEMBER 2011 – REVISED FEBRUARY 2012
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2.4 10Mbs and 100Mbs PMD Interface
PIN
NAME
NO.
TD–, TD+ 16, 17
RD–, RD+ 13, 14
TYPE
I/O
I/O
DESCRIPTION
Differential common driver transmit output (PMD Output Pair). These differential outputs are automatically
configured to either 10Base-T or 100Base-TX signaling.
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.
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
NAME
NO.
XI
34
XO
33
CLKOUT 25
TYPE
DESCRIPTION
CRYSTAL/OSCILLATOR INPUT:
MII reference clock Reference clock. 25MHz ±50ppm-tolerance crystal reference or oscillator input. The
I
TLK110 supports either an external crystal resonator connected across pins XI and XO, or an external
CMOS-level oscillator source connected to pin XI only.
RMII reference clock Primary clock reference input for the RMII mode. It must be connected to a 50MHz
±50ppm-tolerance CMOS-level oscillator source.
O
CRYSTAL OUTPUT: Reference Clock output. XO pin is used for crystal only. This pin should be left floating
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
O pin provides a 50MHz clock output. This 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
NAME
NO ^TYPE
.
DESCRIPTION
LED Pin to indicate status.
LED_LINK/AN_0
Mode 1
28 S, O, PU
Mode 2 and
Mode 3
LINK Indication LED; indicates the status of the link. When the link is good, the LED
will be ON.
ACT indication LED and indicates transmit and receive activity in addition to the
status of the Link. The LED is ON when Link is good. It will blink when the transmitter
or receiver is active.
LED_SPEED/AN_1
27
S, O, PU
LED Pin to indicate the speed of the link. SPEED Indication LED indicates whether the link is
100Mb/s or 10Mb/s. It is ON when the link speed is 100Mbs and OFF when it is 10Mbs.
LED Pin to indicate status.
LED_ACT/AN_EN
Mode 1
26 S, O, PU
Mode 2
ACT indication LED, and indicates if there is any activity on the link. It is ON (pulse)
when activity is present on either Transmit or Receive channel.
COL indication LED, and indicates collision detection.
Mode 3
may be programmed to DUPLEX Indication LED and indicates Full-duplex status.
6
Pin Descriptions
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