PDP83TG720SWCSTQ1 datasheet(35/199 Pages) TI

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7.4.3 Standby

The device (MDI Master mode or MDI Slave mode) automatically enters into standby post power-up and reset so

long that the device is bootstrapped for managed operation.

In standby, all PHY functions are operational except for PCS and PMA blocks. Link establishment is not possible

in standby and data cannot be transmitted or received. SMI functions are operational and register configurations

are maintained.

If the device is configured for autonomous operation through bootstrap setting, the PHY automatically switches

to normal operation once powered on and reset complete.

7.4.4 Normal

Normal mode can be entered from either autonomous or managed operation. When in autonomous operation,

the PHY will automatically try to establish link with a valid Link Partner once powered on.

In managed operation, SMI access is required to allow the device to exit standby; commands issued through the

SMI allow the device to exit standby and enables both the PCS and PMA blocks. All device features are

operational in normal mode.

Autonomous operation can be enabled through SMI access by setting bit[6] in register 0x18B.

7.4.5 Sleep

Once in sleep mode, all PHY blocks are disabled except for energy detection. All register configurations are lost

in sleep mode. No link can be established, data cannot be transmitted or received and SMI access is not

available when in sleep mode.

To use sleep mode of PHY refer to implementation highlighted in following figure.

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DP83TG720S-Q1

SNLS604 – SEPTEMBER 2020

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PDP83TG720SWCSTQ1 Datasheet(PDF) 35 Page - Texas Instruments