IP2022 Data Sheet www.ubicom.com 65 5.6.2 SxMODE Register Table 5-9  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/Out- put 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 5-10  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 7 6 5 4 3 2 1 0 PRS3:0 SUBM1:0 CLKS1:0 Name Description PRS3:0 Protocol select (see Table 4-7). All other
encodings are reserved.
0000 =   Disabled
0001 =   10Base-T
0010 =   USB Bus
0011 =   UART
0101 =   SPI
0110 =   GPSI
SUBM1:0 Submode select
USB mode:
        01 =   Low-speed USB interface
        10 =   High-speed USB interface
SPI mode:
00 =   Positive clock polarity, receive             on rising edge, transmit on fall-
            ing edge
01 =   Positive clock polarity, receive
            on falling edge, transmit on ris-
            ing edge
10 =   Negative clock polarity, receive
            on falling edge, transmit on ris-
            ing edge
11 =   Negative clock polarity, receive
                    on rising edge, transmit on fall-
                    ing edge
GPSI mode:
00 =   Receive on rising edge, trans-             mit on falling edge
01 =   Receive on falling edge, trans-
            mit on falling edge
10 =   Receive on rising edge, trans-
            mit on rising edge
11 =   Receive on falling edge, trans-
mit on rising edge Name Description