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TUSB1210: EMI concerns from USB and ULPI clock rates

Part Number: TUSB1210

We have a customer using our board in their design now.  We use the TUSB1210 as our USB 2.0 PHY to communicate with our Xilinx ZYNQ FPGA/SoC.  Our customer just went to EMI/EMC testing.  They reported that they have issues at 420 MHz, 480 MHz, and 540 MHz.  Our initial EMI/EMC testing with this same design didn't see any of these frequencies or had any issues.  We just sniffed a recent board with a simple setup to see if we could replicate it with a basic simple setup.  We don't see anything happening over the board except near the TUSB1210 PHY and especially at the USB Mini connector.  The PHY is setup to run High Speed at 480 MHz and the ULPI Clock to the FPGA is running at 60 MHz. Any thoughts on what might be causing this?  I didn't see anything in the register map.  The design hasn't changed in year, so I am baffled as to why we are seeing this now versus our initial screening a few years back.