AM2732-Q1: RGMII RD interface internal pull down resistor value

Hello,

I am looking into your query regarding the internal pull resistor values for these AM273x LVCMOS pins. Please allow a few days for response.

Best Regards,

Zackary Fleenor

Hi Fleenor,

Normally, the output IO pull-down impedance range from 20Ω-100Ω. RGMII RD is input pin for AM2732, usually, input pin's internal pull-down resistor range at -kΩ，please double confirm.

Thanks！

The same LVCMOS voltage buffer is used for both Input and Output signals.  Each pin has a receive buffer,  transmit buffer,  and the same set of pull resistors. Input/Output functionality just a matter of the associated IOMUX control register configuration. 

Best Regards, 

Zackary Fleenor

Hi Fleenor,

Thanks for the clarification!

InTIDA-020047 Two-device mmWave cascade reference design，DP83TC812R-Q1 strap resistor is open or 2.49KΩ，and divide with AM2732 internal pull down resistor, it seems unreasonable the voltage on strap pin is less than 5mV to define two modes.

TIDA-020047 Schematic

DP83TC812x-Q1 TC-10 Compliant 100BASE-T1 Automotive Ethernet PHY datasheet (Rev. B)

Hello,

I'm a little lost. Apologies for my confusion here.

Is the issue that the incorrect boot mode is being latched for the DP83TC812x-Q1 device?

Hi Fleenor,

Not an actual issue for the TIDA-020047 reference design is TI internal verification EVM，I think it is a risk.

At the same time，I creat a new thread for DP83TC812x-Q1.

Thanks！

Understood, I think the DP38TC812x-Q1 team will best assist from this point. Can you provide the link to the new thread for reference? Please feel free to reach out again or provide my contact information with the other supporting team (fleenor@ti.com). Is it okay to close this thread in the meantime? 

Best Regards,

Zackary Fleenor