DP83TC811S-Q1: SLEEP?

kevin.huang_FJXM

Part Number: DP83TC811S-Q1
Other Parts Discussed in Thread: DP83TC811

HI TEAMS:

We are debugging the sleep wake function of dp83tc811 chip

I found I couldn't sleep.

Condition: pull up the wake before the PHY is powered on, and the PHY chip can be recognized normally. It is only set to the slave mode and is not connected to the device in the master mode.

Set according to figure 1:

1. Lower the wake foot

2. Set register 0x18b to 0x5b, register 0x4e5 to 0x3c3, register 0x487 to 0xa01 and register 0x18c to 0x2

Check that the INH pin does not go high, indicating that it has not entered sleep.

We found that our phenomenon is the same as that of the forum, e2e.ti.com/.../2729720 -sitesearch&keymatch=dp83tc811%252525252525252520sleep#2729720

So we measured the level of MDIO and kept it at the high level. Is it because of the high level that we cannot sleep?

over 1 year ago

0 Alvaro (Al-vuh-roe) Reyes over 1 year ago

TI__Genius 12406 points

Hi Kevin,

I'm not sure that I'm understanding the problem.

Are you saying there is energy on the MDIO line which is preventing device from sleep?

If so, there's nothing wrong, that's how it should be

Just to note, 811 has a custom Sleep & Wake-up Functionality. We recommend using DP83TC812 for standard compliant sleep & wake-up

Regards,

Alvaro

0 kevin.huang_FJXM over 1 year ago in reply to Alvaro (Al-vuh-roe) Reyes

Expert 2925 points

1. We measured that the MDIO level is high. Is this not data? But since MDIO has a pull-up resistor, will there be idle to prevent the PHY from entering sleep?

2. Our requirement is that the equipment is powered on and the PHY is used normally. When you want to enter sleep, pull the wake pin down and set the PHY register to enter sleep. Can this be achieved in dp83tc811?

The current test is a single dp83tc811, and no link is established. Will this affect the sleep?

0 Alvaro (Al-vuh-roe) Reyes over 1 year ago in reply to kevin.huang_FJXM

TI__Genius 12406 points

Hi Kevin,

Apologies for my last reply, I meant to say the MDI lines, not MDIO.

As mentioned in the datasheet, device will exit sleep when WAKE is pulled High or when Energy is detected on MDI Lines, does this meet your project requirements?

Can you give more details of the project? Is it a new Design?

You mentioned that the Device is set in Slave Mode, what device is the master?

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/725394/dp83tc811s-q1-dp83tc811s-q1-can-t-into-sleep-mode/2729720?tisearch=e2e

The E2E link you mentioned (linked above) mentions that DP83TC811 is NOT TC10 compliant. Meaning both the Master and Slave need to be the 811 to enter sleep.

Regards,

Alvaro

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DP83TC811S-Q1: SLEEP?