TM4C129XNCZAD: Ethernet PHY capacitor values

Hello Peter. These capacitors are called decoupling capacitors and are there to ground any spurious noise signals that may affect the +rail-line on the processor's VDD pin. Because small capacitance, and capacitors in general, act as high-pass filters, anything above DC which would be nothing else than random AC noise from power network or elsewhere, as myriads of harmonics, is zeroed. The value of the capacitor usually depends on how long is the pit-line that carries the VDD from the psu of the board to the processor's VDD input. All electronic circuits employ such capacitors almost in touch with the IC's VDD pin to the ground.
John

I am familiar will decoupling capacitors nears voltage supply pins, but these caps appear to be decoupling pull up resistors and the transformer.

O.K. these are L-C tuned circuits, along with the coils of the magnetics, that probably zero FQs that emerge on the 3.3 volts rail. They block/ground frequencies at the range of 1/(2π√(LC)) that emerge as harmonics of the oscillating parts on the PCB. These are filters tuned to isolate magnetics from harmonics.

John

Hello Amit. Indeed, the Ethernet schematics of the EK-TM4c1294XL Launchpad - Sheet: 4/6 - at the very exact same side of the transformer, have 0.1uF capacitors - C22 & C18. However, a closer inspection reveals that while in the DK-TM4C129x schematics displayed above there are R-L-C branches to the right side of the magnetics - HX1188FNL, in the EK-TM4C1294XL launchpad's schematics they simply don't exist. Maybe the notch filters design in the two launchpads follow different course, because the magnetics on EK-TM4C1294XL use the HX1198FNL module which is of a far better performance. Also, at page 30/41 of the DK-TM4C129X launchpad user's guide the values of the capacitors are correctly printed as 0.1uF.
John