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The DP83620 supports both Twister Pair (100BASE-TX and 10BASE-T) and Fiber (100BASE-FX) media. The port may be configured for Twisted Pair (TP) or Fiber (FX) operation by strap option or by register access. At power-up/reset, the state of the RX_ER pin will select the media for the port. The default selection is twisted pair mode, while an external pull-down will select FX mode of operation. Strapping the port into FX mode also automatically sets the Far-End Fault Enable, bit 3 of PCSR (16h), the Scramble Bypass, bit 1 of PCSR (16h) and the Descrambler Bypass, bit 0 of PCSR (16h). In addition, the media selection may be controlled by writing to bit 6, FX_EN, of PCSR (16h).
