V62SLASH12615-01XE-R datasheet(61/92 Pages) TI1

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DP83848-EP

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SLLSEC6D – SEPTEMBER 2012 – REVISED JUNE 2013

Example: To generate an interrupt on a change of link status or on a change of energy detect power state,

the steps would be:

•

Write 0003h to MICR to set INTEN and INT_OE

•

Write 0060h to MISR to set ED_INT_EN and LINK_INT_EN

•

Monitor PWR_DOWN/INT pin

When PWR_DOWN/INT pin asserts low, user would read the MISR register to see if the ED_INT or

LINK_INT bits are set, i.e. which source caused the interrupt. After reading the MISR, the interrupt bits

should clear and the PWR_DOWN/INT pin will deassert.

7.6

Energy Detect Mode

When energy detect is enabled and there is no activity on the cable, the DP83848 will remain in a low

power mode while monitoring the transmission line. Activity on the line will cause the DP83848 to go

through a normal power up sequence. Regardless of cable activity, the DP83848 will occasionally wake

up the transmitter to put ED pulses on the line, but will otherwise draw as little power as possible. Energy

detect functionality is controlled via register energy detect control (EDCR), address 0x1Dh.

7.7

Thermal Vias Recommendation

The following thermal via guidelines apply to GNDPAD, pin 49:

1. Thermal via size = 0.2 mm

2. Recommend 4 vias

3. Vias have a center to center separation of 2 mm

Adherence to this guideline is required to achieve the intended operating temperature range of the device.

Figure 7-4 illustrates an example layout.

Figure 7-4. Top View, Thermal Vias for GNDPAD, Pin 49

DESIGN GUIDELINES

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