NAT-MCH Clock-PCB – Technical Reference Manual
Version 1.4
© N.A.T. GmbH
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11 NAT-MCH CLK Module Programming Notes
11.1 SPI Interface
The SPI interface on the
CLK Module
is used only for maintenance purposes, e.g. updating
the microcontroller firmware.
11.2 I²C Interface
The I²C interface is the main communication interface between the microcontroller and the
CPU of the
Basic-Module
. All communication is based on IPMI Messages.
11.3 Register
Functions that are controlled by following registers are realized within the FPGA. Only red
cycles on register Firmware Version Register are directly answered by the Atmel
Microcontroller.
To get a better understanding of the (multiplexer-) functions that can be controlled by the
following registers, Figure 11 shows a detailed overview.
Figure 11: Detailed Functional overview
