Peripherals—IP2022 User’s Manual 272 www.ubicom.com Figure 4-9 shows the transmit data paths. The SxTXP and SxTXM
pins correspond to the differential outputs of the USB or Ethernet
bus. Other serial protocols require only one output pin, which is
SxTXP by default. Figure 4-9  Transmit Data Paths The SxTXP and SxTXM pins have high current outputs for driving
Ethernet magnetics directly without the use of transceivers. When the clock select register is programmed with the value for
10Base-T,  the  transmit  pre-emphasis  requirement  enables  the
SxTXPE   and   SxTXME   outputs,   which   have   a   50ns-delayed 515-018.eps     Transmit
Configuration   Register
(SxTCFG) Transmit Clock SxOE    Data
Encoder Transmit   Buffer
Register (SxTBUF) Data Bus SxTXPE Pre-Emphasis      EOP
Generator SxTXME SxTXP SxTXM TXBE, TXEOP Transmit
Interrupt