Functional Description
ATCA-F140 Installation and Use (6806800M67H
)
76
4.4.1
Temperature Sensors
The on board temperature sensors are implemented using National LM75 digital temperature
sensors. The following table provides the upper non-critical, critical and non-recoverable
temperature thresholds for each of the onboard temperature sensors.
4.5
FPGA
A Xilinx XC3S400A Spartan 3A family FPGA is used on the board to provide a combination of
glue logic functions and telecom clock support functions. These functions include the
following:
Local Bus Interface
Local Bus Decoder
Low pin count interface between Host and IPMC
Interrupt Routing Unit
Reset Controller
Local Bus to SPI Interface
Telecom Clocking Support
Table 4-1 Temperature Sensors
Device
Temperature Thresholds
Sensor Type
Non Critical
Critical
Non
Recoverable
Air Inlet Component Side
1
45C
55C
72C
LM75
BIX (BCM56334)
55C
70C
115C
LM75
FIX (BCM56846)
55C
70C
110C
On-die thermal diodes
Service Processor
(P2020)
55C
65C
115C
LM75
Stratum Clock Oscillator
50C
55C
85C
LM75
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