MA28140 datasheet(32/72 Pages) DYNEX

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MA28140

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The sample signals FAR1S and FAR2S should be

asserted to fetch the 32 bits of FAR. 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 FAR status report interface is not used, the

FAR1S and FAR2S signals should be connected to VDD.

Figure 14 describes the FAR telemetry serial interface.

Serial AU Status Interface in 5 Samples Mode

The 80 bit Authentication 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 (ee section 5.4). The serial

interface in 5 samples mode is implemented with 4 signal lines:

• AU1S: first status sample input,

• AU2S: second status sample input,

• TMC: status clock input, is also used for CPDUS and

FAR.

• TMD: status data output, is also used for CPDUS and

FAR.

When AU1S is asserted, the pointer for reading out data

with AU2S is reset to the second octet of the report. The

sample signals AU1S and AU2S should be asserted as

described in Figure 15 to fetch the 80 bits of AUS report.

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 AU status

report interface is not used, the AU1S and AU2S signals

should be connected to VDD.

Figure 15 describes the AUS telemetry serial interface.

Serial CPDU, FAR, AU Status Interface in 2

Samples Mode

The 16 bit Command Pulse Distribution Unit status report,

the 32 bit Frame Analysis report and the 80 bit Authentication

Unit status report can be retrieved through this interface. The

serial interface in 2 samples mode is implemented with 4

signal lines:

• CPDUS: first status sample input,

• FAR1S: second status sample input,

• TMC: status clock input,

• TMD: status data output.

Note: The 0 bit is the MSB and is transmitted first.

Figure 14: FAR Telemetry Serial Interface

FAR1S

FAR2S

TMC

TMD

PTD

APPLICATION

Telemetry

System

PAR = 0

FAR Status Report Serial Interface

1 2 3 4 5

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MA28140 Datasheet(PDF) 32 Page - Dynex Semiconductor

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