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ATCA-C110/1G Installation and Use Manual
Chapter 4 Functional Description
50
REVIEW COPY
I
2
C Bus
There are two I
2
C interfaces on the ATCA-C110/1G.
■ The Private I
2
C buses from the IPMI Controllers
■ The I
2
C interface from the MPC8540
The private I
2
C Address Map for MPC8540 is shown in Table 6-4 on page 74.
RTC interface
The ATCA-C110/1G supports an RTC device on the I
2
C bus of the MPC8540. The RTC
functions on normal 3.3V when the board is powered on and is backed-up by a super capacitor
to store the parameters in the absence of backplane power to the board. The default I
2
C
address for the RTC is 0xD0h. The RTC is fully compliant to the following:
■ TBD
Power Supplies
The ATCA-C110/1G has power input from the Zone 1 connector of the ATCA backplane.
A power brick, of 200W output power, is used on the board to derive the Payload power. A 5W
power brick is used to derive the Management power from the -48V input from the backplane.
The Payload power is used to drive the onboard regulators, which are used to generate the
required voltages for the onboard devices.