Rohde & Schwarz CMU200 - Page 70

Instrument Design and Function Description CMU
1100.4903.82 3.14 E-4
Control and supply
The control, bus lines and voltage supply of the UNIV. SIGN. UNIT
MODULE are connected via two 96-pin VG multipoint connectors from
MOTHERBOARD1. Further interfaces for testing and debugging are
provided on the top of the module.
Function
As standard, the UNIV. SIGN. UNIT MODULE contains the three
sandwich boards DSP MODULE0, DSP MODULE1 and IQOUT
MODULE.
Besides, if a very high computing power is required, two further DSP
MODULES (DSP MODULE2, DSP MODULE3) and the SHARED
MEMORY can be fitted.
Furthermore, a slot for the Option CMU-B52 SPEECH CODEC is
provided. This option includes DSP MODULE3.
A microprocessor with peripheral equipment and two programmable
logic devices (FPGA ’XILINX1’ and ’XILINX2’) on the UNIV. SIGN.
UNIT control all the processes on the module.
An RS232 interface is available for debugging, data input and output.
Besides, an ISA bus interface is installed for control and data
communication with the FRONT MODULE CONTROLLER.
DSP MODULE
The two sandwich DSP MODULES (DSP MODULE0 and DSP
MODULE1) are directly inserted on the UNIV. SIGN. UNIT via four
multipoint connectors. Via a FIFO device, they receive the digital I/Q
data from the DIGITAL BOARD for evaluation. The signal can then be
demodulated by the DSP MODULES and the demodulated data can be
passed on the protocol engine running on the MC or a DSP MODULE.
The DSP MODULES can also perform some measurements and the
results are passed on via the ISA bus interface to the FRONT
MODULE CONTROLLER.
Likewise, the DSPs cause further actions on the transmitter side (TX),
e.g. change transmit frequency-settings via the FPGA ’XILINX2’ and
output analog I/Q data via the IQOUT MODULE.
IQOUT MODULE
The sandwich IQOUT MODULE is directly inserted on the UNIV. SIGN.
UNIT via three multipoint connectors and installed in an extra shielding
chamber, since it performs the digital-to-analog conversion of the I/Q
data.
Option SPEECH CODEC
CMU-B52
The Option SPEECH CODEC CMU-B52 (including DSP MODULE3) is
also designed as sandwich module and is directly plugged onto the
UNIV. SIGN. UNIT via three multipoint connectors. This option permits
to read in and output analog speech signals (handsetin/out lines) via
A/D and D/A converters.