NAT-MCH Users Manual Version 1.10

NAT-MCH – Users Manual
3.1.2 Clock Modules
Available Options:
• -TC: Telecom Clocking
• -SSC: Spread Spectrum clocking for FCLK-A (only in combination with option –X24
or –X48)
3.1.2.1 Telecom Clocking Module
The clock module provides the telecom clocks CLK1 and CLK2 to the 12 AMC modules as
well as the fabric clock FCLK-A.
The telecom clocks can be sourced from either of the AMC modules by means of CLK2 as an
input to the MCH or from the front panel external clock reference input.
3.1.2.2 Spread Spectrum Clocking Module (SSC)
The Spread Spectrum Clocking module (SSC) distributes a 100 MHz clock to any of the
AMC slots. The clock can be configured to be a standard 100 MHz clock or a 100MHz
Spread Spectrum Clock (see Table 2). The clock is switched onto the individual AMC slots
according to the E-Keying definitions acquired from the AMC module in the respective slot.
3.1.3 HUB Mezzanine Modules
Optionally the NAT-MCH can be equipped with mezzanine modules which provide the data
switching functionalities for the fabrics D-G of the uTCA backplane.
The available and planned options are:
• -X24: PCIe Hub module for up to 6 AMC modules
• -X48: PCIe Hub module for up to 12 AMC modules
• -SRIO: Serial Rapid I/O module for up to 12 AMC modules
• -XAUI: (10 GbE) module for up to 12 AMC modules (available: Q3/2008)
For a detailed description of these modules and their technical data, please refer to the
corresponding hardware manual.
3.1.3.1 PCI Express Switching Module (X24 and X48)
The PCIe module X24 (X48) supports switching of 1-4 PCIe lanes for up to 6 (12) AMC
slots.
Several configuration options which can be set by the MCH configuration menu (see Chapter
Configuration) allow the flexible adoption of the PCIe hub to a certain environment.
Version 1.10 © N.A.T. GmbH 14