TLK105_16 Datasheet, PDF (12/104 Pages) Texas Instruments – TLK105 TLK106 Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer

TLK105
TLK106
SLLSEB8C – AUGUST 2012 – REVISED APRIL 2016
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3.8 LED Interface
The TLK10x supports one configurable Light Emitting Diode (LED) pin. The device supports 2 LED
configurations: Link and Activity. Functions are multiplexed into two modes. The LED can be controlled by
configuration pin and internal register bits. Bit 5 of the PHY Control register (PHYCR) selects the LED
mode as described in Table 3-4.
MODE
1
2
Table 3-4. LED Mode Select
LED_CFG[0]
(BIT 5) or (PIN 27)
1
0
LED_LINK
ON for Good Link
OFF for No Link
ON for Good Link
BLINK for Activity
The LED_LINK pin in Mode 1 indicates the link status of the port. The LED is OFF when no link is present.
In Mode 2 it is ON to indicate that the link is good; BLINK indicates that activity is present on either
transmit or receive channel. Bits 10:9 of the LEDCR register (0x18) control the blink rate. The default blink
rate is 5Hz. Enabling Enhanced LED Link via the CR2 register (0x0A) bit 4 overrides the LED blinking
functionality of the PHYCR register (0x0019) bit 5. The Link LED will not blink for activity when Enhanced
LED Link is enabled.
See Figure 3-4 for an example of AN_0 connections to external components. In this example, the
configuration results in Full-Duplex advertised.
AN_O = 1
2.2 kW
470 W
V_CC
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Figure 3-4. AN Pin Configuration and LED Loading Example
12
Hardware Configuration
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