NAT-MCH Clock-PCB – Technical Reference Manual
Version 1.4
© N.A.T. GmbH
16
7 BOARD FEATURES
•
PLL
The board is equipped with a Zarlink ZL30105 Stratum 3 PLL, which provides various
typical telecom frequencies in the range from 8 kHz to 65.536 MHz. Especially to the
two frequencies 8 kHz and 19.44 MHz, which are recommended for telecom
applications by the MicroTCA Specification, are supported.
The Zarlink PLL is only assembled if the “TC-Option” is chosen.
•
Microprocessor
To configure the
CLK Module
an Atmel 8-bit microprocessor resides on the
CLK
Module
.
•
Interfaces
CLK1: The
NAT-MCH CLK Module
implements clock interfaces to 12
AMCs. These interfaces can be used to send a clock signal to the
AMCs, or to receive a reference clock signal from any of the 12
AMCs.
CLK2: The
NAT-MCH CLK Module
implements clock interfaces to 12
AMCs. These interfaces can be used to send a clock signal to the
AMCs, or to receive a reference clock signal from any AMC.
CLK3: The
NAT-MCH CLK Module
implements clock interfaces to 12
AMCs. These interfaces can be used to send one of the telecom clock
signals, or a PCI Express clock signal to the AMCs.
Update CLK:
The
NAT-MCH CLK Module
implements 2 update channels (update
CLK1 and CLK3). These channels are full-duplex connections to a
second NAT-MCH. They can only be used to send and receive
telecom clock signals (not the PCI Express clock signal).
Ext.-ref.-CLK: The
NAT-MCH CLK Module
supports an external reference clock
in- or output, accessible via a face plate connector. This signal is
routed to the
Base-Module
, were the face plate connector is
assembled. If the external clock interface is used to receive a reference
clock, this clock signal is amplified by a special input circuit on the
Base-Module
. This circuit accepts signal forms in a wide range,
concerning frequency and input voltage as well as single ended or
differential. For a more detailed specification of the input signal
please refer to the hardware reference manual of the
Base-Module
.
