IP2022 User’s Manual—Peripherals www.ubicom.com 275 The  protocol  mode  also  affects  the  signal  usage,  as  shown  in
Table 4-7. The clock frequencies required for 10Base-T Ethernet
and USB protocols are shown in Table 4-8. Table 4-7  Signal Usage Mode SxRXD  SxRXP  SxRXM  SxTXM   SxTXP   SxTPE   SxTME  SxCLK Disabled   Not
Used   Not
Used   Not
Used   Not
Used   Not
Used   Not
Used   Not
Used   Not
Used 10Base-T Input Input Input Output   Output   Output   Not
Used Input USB Bus Input   Not
Used   Not
Used Output   Output   Output   Output   Not
Used UART Input   Not
Used   Not
Used   Not
Used Output   Not
Used   Not
Used   Not
Used SPI Input Note 1   Not
Used   Not
Used Output   Not
Used   Not
Used Note 2 GPSI Input Input   Not
Used  Input/
Output^{Output   Output} Input Note 2 Note 1. Not used in master mode, input in slave mode.
Note 2. Output in master mode, input in slave mode. Table 4-8  Required Clock Frequencies From PLL Protocol Receive Transmit USB 1.1 High Speed 48 MHz 12 MHz USB 1.1 Low Speed 6 MHz 1.5 MHz 10Base-T Ethernet 80 MHz 20 MHz