EKF SC1-ALLEGRO, Руководство пользователя

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User Guide • SC1-ALLEGRO •
CompactPCI ® Serial
CPU Board • Intel® i7-3xxx Processor
Local SMB Devices
The SC1-ALLEGRO contains devices that are attached to the System Management Bus (SMBus). These
are the SPD EEPROMs for the on-board memory or the possibly plugged SODIMM, a general purpose
serial EEPROM, a supply voltage/temperature controlling device and a set of board control and status
registers. Additional devices may be connected to the SMBus via the
CompactPCI ®
Serial backplane
signals I
2
C_SCL (P1 B2) and I
2
C_SDA (P1 B3), or pins 29/30 of the mezzanine expansion connector
J-EXP.
Address Description
0x58 Hardware Monitor/Memory Down Temperature Sensor (LM87)
0x5C Board Control/Status
0xA0 SPD of On-board Memory
0xA4 SPD of SODIMM
0xAE General Purpose EEPROM
Hardware Monitor LM87
Attached to the SMBus, the SC1-ALLEGRO is provided with a hardware monitor (LM87). This device
is capable to observe the board and on-board memory temperatures, as well as several supply voltage
rails 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 SC1-ALLEGRO:
Input Source Resolution
[mV]
Register
AIN1 Processor 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 +12V 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 range, the LM87 can request an interrupt via the GPI13 input of the QM77 PCH (which may
result in a system management interrupt).
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