Dmd2050E Baseband Processing Printed Circuit Card - Comtech EF Data DMD-2050E Installation And Operation Manual

DMD2050E Universal Satellite Modem
3.1.2

DMD2050E Baseband Processing Printed Circuit Card

The advent of million-plus gate count FPGAs, advanced logic synthesis tools, and DSPs
providing hundreds of MIPs enabled the design of a software configurable modem. Large, fast
FPGAs now provide designers with what is essentially an on the fly programmable ASIC. High
speed, complex digital logic functions that previously could only be implemented in dedicated
integrated circuits are now downloaded from a micro-controller through a serial or peripheral
interface. When a new digital logic function is needed, a new configuration file is loaded into the
FPGA. There is no limit to the number of digital logic configurations available to the FPGA, aside
from the amount of Flash memory available to the system microprocessor for storage of
configuration files.
The DMD2050E Baseband Processing Printed Circuit Card provides a flexible architecture that
allows many different modes of terrestrial and satellite framing, various FEC options, digital voice
processing, and several different modulation/demodulation formats. Also included on the
Baseband Printed Circuit Card are three synchronous interfaces, an EIA-530 Interface supporting
MIL-188-114A and RS-422. All three interfaces are provided on the same DB-25 Connector, and
are selectable from the front panel.
A block diagram of the Baseband Processing Card is shown in Figure 3-3.
MN-DMD2050E Revision 2
Theory of Operation
3–3