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DP83TG720R-Q1: Ethernet test mode 1 125Mhz clock loss

Part Number: DP83TG720R-Q1

We turned off the CLKOUT PIN pin (REG 0x453=0x6 and REG 0x452 = 0x600) in normal operation mode, and then switched to test mode 1, and found that CLKOUT's 125Mhz clock was lost.