Owner's manual
Table Of Contents
- ETX-CV
- Revision History
- Table of Contents
- Preface
- 1 Introduction
- 2 Specifications
- 3 Function Diagram
- 4 Mechanical Dimensions
- 5 Embedded Functions
- 6 Pin-out and Signal Descriptions
- 7 System Resources
- 8 BIOS Setup Utility
- 9 BIOS Checkpoints, Beep Codes
- Appendix A: Connectors and Mounting
- Important Safety Instructions
- Getting Service
ETX-CV User’s ManualPage 36
7.5 PCI Interrupt Routing Map
PIRQ A B C D E F G H
INT Line INTA INTB INTC INTD
VGA X
UHCI 1 X
UHCI 2 X
UHCI 3 X
UHCI 4 X
EHCI X
SATA X
SMBus X
Audio X
PCI Slot1 INTA INTB INTC INTD
PCI Slot2 INTB INTC INTD INTA
PCI Slot3 INTC INTD INTA INTB
PCI Slot4 INTD INTA INTB INTC
LAN INTA
7.6 System Management Bus (I2C-compatible)
Internally the SMB bus and I2C bus are one and the same. The ICH7-M Southbridge supports
SMBDAT and SMBCLK lines that are I2C-compatible.
The X4 connector has pins for both the I2C and SMB bus. Both are connected to the same
internal bus: the SMB bus. It is advisable to always connect external I2C devices to the I2C pins
and SMB devices to the SMB pins to ensure compatibility with other modules that might support
two internal busses (a separate I2C and SMB bus).
Address Function Device
2Eh Super I/O Read/Write SIO
A0h Memory SPD SO-DIMM
D2h Clock Generator CLK GEN