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Contents COM Express Extension Specification This page intentionally left blank Table of Contents 2 PCI Copyright Notice User InformationAbout This Document Technical SupportCOM Express Extension Design Guide COM Express Extension SpecificationIntroduction COM Express Computer-On-ModuleCopyright COM Express Extension Specification Rev Objective COM Express Module sizes Overview Module SizeFigure Overview three module sizes Small Form Factor nano, COM Express TypeFigure Small Form Factor nano Table Graphic Signal Description Row C for Pin- out Type Signal DescriptionGraphic Signal Description Table Graphic Signal Description Row D for Pin- out Type Tmds Clock + Tmds Clock Wide Range Input Power for nano SmallFormFactor SFF Hardware extensionsGpio General Purpose I/O Recommended Use GPO0Alternative Gpio use for Sdio Interface Sdio Pin descriptionElectrical characteristics Thermal ControlTPM support Smart Battery Bios supportSoftware extensions Console redirection in Bios Legacy Super I/O support in BiosCmos backup in Bios User editor for default settingsBuses 1 ISA, Standard PS/2 ConnectorsApendix a PC Architecture Information General PC ArchitectureSerial ATA Ports1 RS-232 Serial 3 USBProgramming Appendix B DOCUMENT-REVISION History