NAT-MCH Hub Module PCIe – Technical Reference Manual
Table 5:
2
nd
Switch to Fabric Port Mapping
# AMC Slot
Fabric D-G
#Port
2
nd
PEX8532
AMC7 2
AMC8 1
AMC9 8
AMC10 9
AMC11 10
AMC12 11
Connection to
1
st
PEX8532
0
Not used
3
9.2
Spread Spectrum Clock
An ICS9FG104 clocking device generates a PCI Express compliant clock signal with a
frequency of 100 MHz fixed or spread spectrum (0.5% down spread). The ICS9FG104
feeds the PEX8532 with this clock signal. Additional the
CLK Module
can be sourced
by the ICS9FG104 over CON4.
9.3 Microcontroller
An 8-bit Atmel microcontroller resides on the
Hub Module PCIe
. The microcontroller
can be updated by the CPU on the
Base-Module
via the SPI interface. Normal
communication between the CPU and the microcontroller is done by IPMI messages
over the I²C interface.
The strapping options and the reset signal of the switches can be controlled through
programming registers in the microcontroller. Also the spread spectrum function of the
ICF9FG104 can be controlled over these register.
Furthermore, three temperature sensors are connected to a second I²C bus of the
Microcontroller. The microcontroller makes these sensors accessible to the CPU on the
Base-Module
via IPMI.
Version 2.0
© N.A.T. GmbH
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