13
www.versitron.com
4.3.4
FPGA
The FPGA is used to transmit the digitized audio signal from the telephone port. In essence,
it is an asynchronous-to-synchronous converter encoded using proprietary VHDL programming
designed at VERSITRON. A 8.192MHz Oscillator, Y1, provides the clock input to the FPGA.
The FPGA also performs configuration operations for the phone CODEC chipset.
4.3.5
Fiber-Optic Transceiver Circuit
Fiber-optic communications are handled by the SFP module. The power for this module is
isolated from the other power circuits through filters. This helps reduce the supply noise being
coupled into the SFP module. The SFP interfaces directly with the FPGA.
4.3.6
Backplane Transceiver Circuit
Backplane communications are handled by the FPGA. Upon insertion of the unit into a
Versimux II chassis the SFP module will be disabled, and serial communications will occur across
the backplane connection (J5).
