NCR Processor

Overview

NCR (Network Clock Reference) is a procedure to provide the master clock (i.e. time information) of the satellite to all its user terminals. Typically, NCR packets are provided periodically over a continuous DVB-S2 or DVB-S2X link. The receiving user terminal uses the knowledge of the master clock in the system to determine when it is allowed to transmit data in a time-division multiple access (TDMA) system, such as DVB-RCS or DVB-RCS2.

In these TDMA systems, the same frequency band is shared among many terminals, making it mandatory to apply a strict transmission schedule for all terminals. The NCR Processor IP core has two main functionalities:

* NCR tracker
* NCR local clock

The NCR tracker provides a local NCR clock which is frequency- and phase-latched to an incoming DVB-S2/DVB-S2X stream containing NCR information. The absolute phase difference between the NCR tracker and the clock source, e.g., satellite, depends upon the distance to the clock source. The NCR local clock provides a precisely settable NCR source clock provided a local and stable 27 MHz clock and a precise 1 PPS (Pulse Per Second) source are available.

Key Features

Configurable PI Controller to compensate for frequency drifts
Synchronous output clock with external 1PPS input
Easy integration with Creonic components

Benefits

Includes NCR tracker and NCR local clock functionality
Compatible with full range of Creonic IP Cores:

DVB-S2X Demodulator
DVB-S2X Decoder
DVB-S2X Modulator
DVB-RCS2 Modulator

Available for ASIC and FPGAs (AMD Xilinx, Intel)
AXI4-Lite support for configuration and retrieval of status information

Applications

RCS2 return channel slot timing
Clock distribution endpoints
Clock reference source
Low cost replacement for GPS disciplined local oscillator

Deliverables

Deliverable includes VHDL source code or synthesized netlist, HDL simulation models, VHDL or SystemC testbench, and bit-accurate Matlab, C or C++ simulation model

Technical Specifications

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