Table of Contents
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2.6.2 SDP Pins .......................................................................................................... ６３
2.6.3 Gb Ethernet Routing Guidelines ...................................................................... ６４
2.6.4 Gb Ethernet Trace Length Guidelines ............................................................. ６５
2.6.5 Reference Ground Isolation and Coupling ....................................................... ６６
2.7 USB2.0 Ports ........................................................................................ ６７
2.7.1 USB2.0 Signal Definitions ................................................................................ ６７
2.7.1.1 USB Over-Current Protection (USB_x_y_OC#) .................................... ６９
2.7.1.2 Powering USB devices during S5 ......................................................... ６９
2.7.2 USB2.0 Routing Guidelines ............................................................................. ７０
2.7.2.1 USB 2.0 General Design Considerations and Optimization ................. ７１
2.7.2.2 USB 2.0 Port Power Delivery ............................................................... ７１
2.7.2.3 USB 2.0 Common Mode Chokes ......................................................... ７２
2.7.2.4 EMI / ESD Protection ............................................................................ ７３
2.7.3 USB2.0 Trace Length Guidelines .................................................................... ７４
2.8 USB3.0 .................................................................................................. ７５
2.8.1 USB3.0 Signal Definitions ................................................................................ ７５
2.8.1.1 USB Over-Current Protection (USB_x_y_OC#) .................................... ７８
2.8.1.2 EMI / ESD Protection ............................................................................ ７８
2.8.2 USB3.0 Routing Guidelines ............................................................................. ７９
2.8.3 USB3.0 Trace Length Guidelines .................................................................... ８０
2.9 SATA ..................................................................................................... ８１
2.9.1 SATA Signal Definitions ................................................................................... ８１
2.9.2 SATA Routing Guidelines ................................................................................ ８２
2.9.2.1 General SATA Routing Guidelines ....................................................... ８３
2.9.3 SATA Trace Length Guidelines ....................................................................... ８５
2.10 LPC and eSPI Interface *SOM-5992 is not support eSPI. .................. ８６
2.10.1 LPC /eSPI Signal Definition ........................................................................... ８６
2.10.2 LPC Routing Guidelines ................................................................................. ８９
2.10.2.1 General Signals .................................................................................. ８９
2.10.2.2 Bus Clock Routing .............................................................................. ８９
2.10.2.3 Carrier Board LPC Devices ................................................................ ８９
2.10.2.4 eSPI Devices ...................................................................................... ９０
2.10.3 LPC Trace Length Guidelines ........................................................................ ９１
2.11 SPI - Serial Peripheral Interface Bus.................................................. ９２
2.11.1 SPI Signal Definition ...................................................................................... ９２
2.11.2 BIOS Boot Selection ...................................................................................... ９５
2.11.3 SPI Routing Guidelines .................................................................................. ９９
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