MAS28140FB Ver la hoja de datos (PDF) - Dynex Semiconductor

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MAS28140FB

Packet Telecommand Decoder

Dynex Semiconductor 

MA28140

POSITIVE WINDOW AREA = PW

N(S)=V(R)+PW-1

DISCARD FRAME &

SET RETRANSMIT

DISCARD

FLAG

N(S)=V(ARC)+C1EPT

FRAME &

SET V(R)=V(R)+1

FRAME & GO TO

LOCKOUT

N(S)=V(R)-1

STATE

N(S)=V(R)

DISCARD FRAME

N(S)=V(R)-NW

NEGATIVE WINDOW AREA = NW

Figure 5: The FARM Sliding Window Concept

A Frame Sequence Number N(S) falls outside the FARM Sliding Window i.e. in the Lockout Area when:

N(S)>V(R)+PW-1

N(S)<V(R)-NW

In this case, the Lockout flag is set.

When N(S) falls inside the FARM Sliding Window, one of the following three cases can occur:

• First case

N(S)=V(R)

The frame is accepted

• Second Case

N(S)>V(R) and

N(S)≤V(R)+PW-1

The frame is in the positive window and does not contain the expected Frame Sequence Number. The Frame is discarded

and the retransmit Flag is set.

• Third Case

N(S)<V(R) and

N(S)≥V(R)-NW

The frame is in the negative window and is discarded without any other action being taken.

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