User guide

User Guide • PC1-GROOVE • Core

i7 CompactPCI

CPU Board

Local SMB Devices

The PC1-GROOVE contains a few devices that are reachable via the System Management Bus (SMBus).

These are the clock generation chip, the SPD EEPROMs for the onboard memory channel or located

on the SODIMM memory module, a general purpose serial EEPROM and a supply voltage and

temperature controlling device in particular. Other devices could be connected to the SMBus via the

CompactPCI signals IPMB SCL (J1 B17) and IPMB SDA (J1 C17) or pins 29/30 of the expansion

connectors J-EXPT/J-EXPB.

Address Description

0x58 Hardware Monitor/CPU Temperature Sensor (LM87)

0xA0 SPD of Onboard Memory

0xA4 SPD of SODIMM

0xAE General Purpose EEPROM

0xD2 Main Clock Generation (CK-505)

Hardware Monitor LM87

Located on the SMBus the PC1-GROOVE offers a hardware monitor of type LM87/NSC. This device is

capable to observe board and onboard memory temperatures as well as several supply voltages

generated on the board with a resolution of 8 bit. The following table shows the mapping of the

voltage inputs of the LM87 to the corresponding supply voltages of the PC1-GROOVE:

Input Source Resolution

[mV]

AIN1 CPU Core Voltage 9.8 0x28

AIN2 Graphics Core Voltage 9.8 0x29

VCCP1 +1.5V 14.1 0x21

VCCP2/D2- +1.8V 14.1 0x25

+2.5V/D2+ +1.05V 13 0x20

+3.3V +3.3V 17.2 0x22

+5V +5V 26 0x23

+12V +10V 62.5 0x24

Beside the continuous measuring of temperatures and voltages the LM87 may compare these values

against programmable upper and lower boundaries. As soon as a measurement violates the allowed

value, the LM87 may request an interrupt via the GPI13 of the PCH.