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MAR28140FV

Packet Telecommand Decoder

Dynex Semiconductor 

MA28140

CONTENTS

Page

Front sheet ............................................................................ 1

1. Introduction ....................................................................... 2

2. TC Decoder Subsystem Overview .................................... 3

3. PTD Architectural Overview .............................................. 4

4. PTD Functional Description

4.1 Coding Layer ....................................................... 6

4.2 Transfer Layer ..................................................... 9

4.3 Authentication Layer .......................................... 15

4.4 Segmentation Layer ........................................... 21

4.5 CPDU ................................................................. 22

4.6 Telemetry Reporting .......................................... 24

5. PTD Interfaces

5.1 Physical Channel Interface ................................ 27

5.2 MAP Interface .................................................... 27

5.3 Telemetry Interface ............................................ 30

5.4 Parallel Interface ................................................ 34

5.5 CPDU Interface .................................................. 35

5.6 Local Bus Interface ............................................ 36

5.7 Memories ........................................................... 36

5.8 External Authentication ...................................... 41

6. State After Reset ............................................................. 42

7. Signal Description ........................................................... 44

8. Electrical Characteristics and Ratings

8.1 DC Parameters .................................................. 47

8.2 AC Parameters .................................................. 48

9. Package Details

9.1 Dimensions ........................................................ 65

9.2 Pin Assignment .................................................. 66

10. Radiation Tolerance ...................................................... 70

11. Ordering Information ..................................................... 70

12. Synonyms ..................................................................... 71

1. INTRODUCTION

This document is the data sheet of the “Packet

Telecommand Decoder”, henceforth called the PTD.

The PTD is compatible with the ESA PSS-04-107 standard

directly derived from the CCSDS recommendations. This

standard is described in references 1 and 2. The data sheet is

based on both documents for the description of the protocol.

Nevertheless, it was impossible to include the whole reference

documents in the data sheet, thus some specific points of the

protocol or some descriptions of the recommended hardware

implementation have not been included. The reader may find

these points in the applicable documents.

CONVENTION

In this document the two conventions described in

references 1 and 2 apply:

1. The first bit in the field to be transmitted (i.e. the most left

justified bit when drawing a figure) is defined to be Bit 0. When

the field is used to express a binary value, the Most Significant

Bit (MSB) shall be the first transmitted bit of the field (i.e. Bit 0).

Bit 0

N Bit Data Field

MSB

← First Bit transmitted = MSB

Bit N-1

LSB

Note: Some of the external interfaces have parallel busses

(LADR, LDAT, PBUS, SELTC) which have the opposite bit

order specified, i.e. Bit 0 is The Least Significant Bit.

2. An 8-bit word (a byte) is called an OCTET.

REFERENCES

1. “Packet Telecommand Standard” ESA PSS-04-107,

Issue 2, April 92.

2. “Telecommand Decoder Specification” ESA PSS-04-151,

Issue 1, September 93.

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