IBASE Technology COM EXPRESS ET976 Design Manual page 4

2.8 LVDS ........................................................................................................ 29
2.8.1 Signal Definitions ............................................................................... 29
2.8.2 Reference Schematics ....................................................................... 30
2.8.3 Routing Considerations ...................................................................... 32
2.9 Embedded DisplayPort (eDP) .................................................................. 33
2.9.1 Signal Definitions ..................................................................................... 33
2.9.2 Reference Schematics ............................................................................. 34
2.9.3 Routing Considerations ............................................................................ 35
2.10 VGA ......................................................................................................... 36
2.10.1 Signal Definitions ............................................................................... 36
2.10.2 VGA Reference Schematics .............................................................. 37
2.10.3 Routing Considerations ...................................................................... 39
2.10.3.1 RGB Analog Signals .................................................................... 39
2.10.3.2 HSYNC and VSYNC Signals ....................................................... 39
2.10.3.3 DDC Interface .............................................................................. 39
2.11 Digital Audio Interfaces ............................................................................ 40
2.11.1 Reference Schematics ....................................................................... 41
2.11.1.1 High Definition Audio .......................................................................... 41
2.11.2 Routing Considerations ...................................................................... 43
2.12 LPC Bus - Low Pin Count Interface ........................................................ 44
2.12.1 Signal Definition ................................................................................. 44
2.12.2 LPC Bus Reference Schematics ........................................................ 45
2.12.2.1 Super I/O ...................................................................................... 45
2.12.3 Routing Considerations ...................................................................... 47
2.12.3.1 General Signals ............................................................................ 47
2.13 Serial Peripheral Interface Bus ................................................................ 48
2.13.1 Signal Definition ................................................................................. 48
2.13.2 SPI Reference Schematics ................................................................ 49
2.13.3 Routing Considerations ...................................................................... 49
2.14 General Purpose I2C Bus Interface ......................................................... 50
2.14.1 Signal Definitions ............................................................................... 50
2.14.2 Reference Schematics ....................................................................... 50
2.14.3 Connectivity Considerations ............................................................... 50
2.15 System Management Bus (SMBus) ......................................................... 51
2.15.1 Signal Definitions ............................................................................... 52
2.15.2 Routing Considerations ...................................................................... 52
iv COM Express® Carrier Board Design Guide