ADLINK aTCA-6155 - Manual (Page 33)

Functional Description 19
aTCA-6155
Reset
The aTCA-6155 is automatically reset by a precision voltage mon-
itoring circuit that detects a drop in voltage below the acceptable
operating limit of 4.85V for the 5V line and below 3.2V for the 3.3V
line. Other reset sources include the Watchdog Timer, the face
plate push-button switch and also the RESET signal from the
IPMC. The aTCA-6155 responds to any of these sources by initial-
izing local peripherals.
A reset will be generated by the following conditions:
X Power failure, +5 V supply falls below 4.1 V (typ.) or +3.3 V
supply falls below 2.93 V (typ.)
X Pushbutton ´RESET" pressed
X Watchdog time-out
X IPM controller reset
SMBus and I2C Devices
The aTCA-6155 provides a System Management Bus (SMBus)
hosted by the ICH10R and an I2C bus hosted by the IPM control-
ler, H8S/2168. The following table describes the function and
address of the devices.
SMBus Device Address (HEX) I2C Device Address (HEX)
DIMM A 0xA0 PECI-to-I2C 0x92
DIMM B 0xA4 LM75 0x9E
DIMM C 0xA8 PCA9555PW 0x40
DIMM D 0xA0 Fabric Riser Card 0xAE
DIMM E 0xA4
DIMM F 0xA8
Clock Gen 0xD2
Clock Buffer 0xDC