MA28140 Datasheet, PDF (31/72 Pages) Dynex Semiconductor – Packet Telecommand Decoder

MA28140
The sample signal CLCWSA should be activated only once
to fetch the entire CLCW word. The serial CLCW interface has
been designed to allow the VCM device specified in reference
3 to automatically retrieve the CLCWs without any additional
components being required. If one of the CLCW interfaces is
not used, the following signals CLCWSx and CLCWCx should
be connected to V_DD. Activating the CLCWCA (CLCWCB)
signal when CLCWSA (or CLCWSB) is deasserted, will
generate invalid data output on CLCWDA (or CLCWDB).
CPDU Status Report Interface in 5 Samples Mode
The 16 bit Command Pulse Distribution Unit Status report
can be retrieved through this interface. It is possible for an
application to use either a serial or a parallel interface to read
out this status report. The serial or parallel mode is selected
with the PAR configuration pin of the PTD (see section 5.4).
The serial interface in 5 samples mode uses 3 signal lines:
• CPDUS: status sample input.
• TMC: status clock input, is also used for FAR and AUS.
• TMD: status data output, is also used for FAR and AUS.
The sample signal CPDUS needs to be activated only once
to fetch the entire CPDUS word. CPDUS, FAR1S, FAR2S,
AUS1S and AU2S cannot be asserted simultaneously. If
CPDUS, FAR1S, FAR2S, AUS1S and AU2S are not asserted,
activating the TMC signal will generate invalid data on the
TMD output. If the CPDU status report interface is not used,
the CPDUS signal should be connected to V_DD. Figure 13
below describes the CPDU telemetry serial interface.
Serial FAR Status Report Interface in 5 Samples
Mode
The 32 bit Frame Analysis Report can be retrieved through
this interface. It is possible for an application to use either a
serial or a parallel interface to read out this status report. The
serial or parallel mode is selected with the PAR configuration
pin of the PTD (see section 5.4). The serial interface in 5
samples mode uses 4 signal lines:
• FAR1S: first status sample input,
• FAR2S: second status sample input,
• TMC: status clock input, is also used for CPDUS and
AUS,
• TMD: status data output, is also used for CPDUS and
AUS.
CLCW Status Report Serial Interface
PTD
CPDUS
TMC
TMD
APPLICATION
Telemetry
Systems
PAR = 0
Note: The 0 bit is the MSB and is transmitted first.
Figure 13: CPDU Telemetry Serial Interface
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