IP2022 User’s Manual—Peripherals www.ubicom.com 271 Figure  4-8  shows  the  receive  data  paths.  Software  prepares  a
SERDES  unit to receive  data by programming the receive shift
count register (SxRCNT) and the clock select bits in the SxMODE
register  appropriately  for  the  selected  protocol.  The  SxRCNT
register is copied to an internal counter, and when that number of
bits of data has been received, the received data is loaded into the
SxRBUF register. In 10Base-T, GPSI, or USB mode, when an EOP is detected the
SxRCNT  register  is  loaded  with  the  number  of  bits  actually
received, the EOP bit of the SxINTF register is set, and the data
bits  are  loaded  into  the  SxRBUF  register.  The  RXBF  bit  in  the
SxINTE register can be set to enable an interrupt on this event. Figure 4-8  Receive Data Paths 515-004.eps EOP Receive   Count
Register (SxRCNT) Receive Data Receive Clock Receive   Buffer
Register (SxRBUF) Data Bus RXBF Receive
Interrupt