PXA3xx Design Guide - Marvell

Table 61:ULPI 3/6-pin Serial Mode Signals (Continued)Signal ULPI GPIO PHY DIR DescriptionTX_DAT Data[1] GPIO31 Input Tx differential data on D+/D-TX_SE0 Data[2] GPIO32 Input Tx single-ended zero on D+/D-INTERRUPT Data[3] GPIO33 Output Active high interruptRX_DP Data[4] GPIO34 Output Single-ended Rx data from D+RX_DM Data[5] GPIO35 Output Single-ended Rx data from D-RX_RCV Data[6] GPIO36 Output Differential Rx dataRESERVED Data[7] GPIO37 Output Reserved; PHY required to drive this pin low during thismode3-pin Serial PinoutTX_ENABLE Data[0] GPIO30 Input Active high Tx enableDAT Data[1] GPIO31 I/O Tx differential data on D+/D- when TX_ENABLE is highRx differential data on D+/D- when TX_ENABLE is lowSE0 Data[2] GPIO32 I/O Tx SE0 on D+/D- when TX_ENABLE is highRx SE0 on D+/D- when TX_ENABLE is lowINTERRUPT Data[3] GPIO33 Output Active high interrupt19.2 ULPI Low-Power ModeThe U2D supports a low-power mode, or suspend mode, whereby the controller places the PHY intoa power savings mode. The PHY will draw minimal suspend current during this time. Below are thesignal mappings during low-power mode.Table 62:Low-Power Mode SignalsSignal ULPI GPIO PHY DIR DescriptionLINESTATE Data[0] GPIO30 Output Combinatorial LINESTATE driven directly by FSanalog receiverLINESTATE Data[1] GPIO31 Output Combinatorial LINESTATE driven directly by FSanalog receiverRESERVED Data[2] GPIO32 Output Reserved; PHY must drive this pin lowINTERRUPT Data[3] GPIO33 Output Active high interrupt19.3 ULPI Carkit ModeThe PXA31x processor supports ULPI carkit mode, which is used to implement an automotivespeakerphone, either through a self-contained carkit speakerphone adapter or through acarkit-enabled car stereo. The processor supports the carkit mode of operation using either astand-alone external carkit IC, or using a carkit-enabled ULPI PHY.Copyright © 2009 MarvellMV-S301368-00 Rev. AApril 6, 2009, Released Page 159