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DP83TC812S-Q1: DP83TC812 Compilance Test

Part Number: DP83TC812S-Q1

Dear TI team,

  I followed the steps described in SNLA389A Table 3-2(Configured as Slave), and wrote 0x4000 to register 0x0836.
 
  Reading registers back showed my successful write. But no output on TRD_P/TRD_M pins.
 
  Why is that? Are there something I've missed?

Thanks.