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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 Support COM Express Extension Design Guide COM Express Extension SpecificationIntroduction COM Express Computer-On-Module Copyright COM Express Extension Specification Rev Objective COM Express Module sizes Overview Module Size Figure Overview three module sizes Small Form Factor nano, COM Express Type Figure 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 extensions Gpio General Purpose I/O Recommended Use GPO0 Alternative Gpio use for Sdio Interface Sdio Pin description Electrical characteristics Thermal Control TPM support Smart Battery Bios supportSoftware extensions Console redirection in Bios Legacy Super I/O support in BiosCmos backup in Bios User editor for default settings Buses 1 ISA, Standard PS/2 ConnectorsApendix a PC Architecture Information General PC Architecture Serial ATA Ports1 RS-232 Serial 3 USB Programming Appendix B DOCUMENT-REVISION History