Design Guide COM-Express Carrier Board Design Guide Advantech COM-Express Carrier Board Design Guide Addendum Notices The copyright on this user manual remains with Advantech Co., Ltd. No part of this user manual may be transmitted, reproduced, or changed. Other companies’ product names that may be used herein remain the property of their respective owners. The product specifications, design and this user’s manuals content are subject to change without notice. If you have any questions, please contact your merchant or our service center for clarification. We are not responsible for any losses resulting from using this product no matter what the reason. Revision History Version/Revision date Date Description Version 1.0 July, 2006 Initial release Version 1.1 July, 2007 Version 1.2 April, 2009 Change format to Addendum Version 2.0 May, 2010 Version 2.1 August, 2010 Part No. 2006001801 Edition 2.1 Printed in Taiwan August 2010 2 Notices Advantech COM-Express Carrier Board Design Guide Addendum Table of Contents Table of Contents .......................................................................................................3 Chapter 1 Introduction ............................................................................................7 1.1 COM-Express Overview ................................................................ 7 1.2 Terminology .................................................................................. 8 Table 1.1 Conventions and Terminology .......................................8 1.3 Referenced Documents .............................................................. 10 Table 1.2 Referenced Documents ...............................................10 Chapter 2 Carrier Board Schematic Guidelines .................................................11 2.1 Gigabit Ethernet (GBE) ............................................................... 11 2.1.1 Signal Descriptions .......................................................................11 2.1.2 DC Specifications .........................................................................11 2.1.3 Schematic Guidelines ...................................................................12 2.1.4 Layout Guidelines .........................................................................13 2.2 AC’97 Audio / HD Audio .............................................................. 18 2.2.1 Signal Description .........................................................................18 2.2.2 DC Specifications .........................................................................18 2.2.3 AC’97 Audio Spec.........................................................................18 2.2.4 Schematic Guidelines ...................................................................19 2.2.5 Layout Guidelines .........................................................................22 2.3 Serial ATA ................................................................................... 25 2.3.1 Schematic Guidelines ...................................................................25 2.3.2 Layout Guidelines .........................................................................26 2.4 Primary IDE ................................................................................. 27 2.4.1 Signal Description .........................................................................27 2.4.2 DC Specifications .........................................................................27 2.4.3 IDE Spec.......................................................................................28 2.4.4 Schematic Guidelines ...................................................................28 2.4.5 Layout Guidelines .........................................................................30 2.5 PCI Express Bus ......................................................................... 31 2.5.1 Signal Description .........................................................................31 2.5.2 Schematic Guidelines ...................................................................32 2.5.3 Layout Guidelines .........................................................................35 2.6 SDVO .......................................................................................... 38 2.7 PCI-Bus ....................................................................................... 39 2.7.1 Signal Description .........................................................................39 2.7.2 DC Specifications .........................................................................40 2.7.3 AC Specifications..........................................................................40 2.7.4 Schematic Guidelines ...................................................................40 2.7.5 Layout Guidelines .........................................................................44 2.8 Universal Serial Bus (USB) ......................................................... 47 2.8.1 Signal Description .........................................................................47 2.8.2 DC Specifications .........................................................................47 2.8.3 USB Spec. ....................................................................................47 2.8.4 Schematic Guidelines ...................................................................47 2.8.5 Layout Guideline ...........................................................................49 2.9 LVDS ........................................................................................... 51 2.9.1 Signal Description .........................................................................51 2.9.2 DC Specifications .........................................................................51 2.9.3 Schematic Guidelines ...................................................................51 2.9.4 Layout Requirements....................................................................52 Table of Contents 3 Advantech COM-Express Carrier Board Design Guide Addendum 2.10 VGA ............................................................................................ 53 2.10.1 Signal Description .........................................................................53 2.10.2 DC Specifications .........................................................................53 2.10.3 VGA Specifications .......................................................................54 2.10.4 Schematic Guidelines ...................................................................54 2.10.5 Layout Guideline ...........................................................................54 2.11 TV-Out ........................................................................................ 55 2.11.1 Signal Description .........................................................................55 2.11.2 Schematic Guidelines ...................................................................55 2.11.3 Layout Guidelines .........................................................................57 2.12 LPC ............................................................................................. 57 2.12.1 Signal Description .........................................................................57 2.12.2 Schematic Guidelines ...................................................................58 2.12.3 Layout Guidelines .........................................................................58 2.12.4 Application Notes for Super I/O Functions ....................................58 2.13 Power Management Signals ....................................................... 62 2.13.1 Power Good / Reset Input ............................................................62 2.13.2 Reset signals ................................................................................63 2.14 Miscellaneous ............................................................................. 64 2.14.1 Miscellaneous Signal Descriptions ............................................... 64 2.14.2 SPKR ..........................................................................................64 2.14.3 I2C Bus .........................................................................................65 2.14.4 I2C Spec .......................................................................................66 2.14.5 SMBus ..........................................................................................66 2.14.6 WDT ..........................................................................................67 Chapter 3 Power Management and Power Delivery ...........................................68 3.1 Power Design Guidelines ............................................................ 68 3.1.1 ATX Power Delivery Block Diagram ............................................. 68 3.1.2 ATX power with Super I/O ............................................................69 3.1.3 ATX power w/o Super I/O .............................................................69 3.1.4 AT Power Delivery Block Diagram ................................................70 3.1.5 AT Power Working as ATX Mode .................................................71 Chapter 4 PCB Layout Guidelines .......................................................................72 4.1 Nominal Board Stack-Up ............................................................. 72 4.1.1 Four-layer board stack-up .............................................................73 Table 4-1 Recommended Four-Layer Stack-Up Dimensions ...... 73 4.1.2 Six-layer board stack-up ...............................................................74