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MIL-STD 1553B
IA3
MIL-STD 1553B
This course covers the 1553 military bus
Objectives
The bus topology is explained.
Bus frames are studied field per field.
The architecture of a 1553 coupler is described.
The course focuses on testing, covering also MIL-HDBK-1553A.
The course details the software interface necessary to control the coupler.
This course has been delivered several times to companies developing defense/avionics equipments.
A more detailed course description is available on request at
training@ac6-training.com
Prerequisites
Basic knowledge of a processor or DSP.
INTRODUCTION
History
Utilization domain
Objectives of this bus
Protocol overview
The 3 node types: BC, RT and BM
Multiplex selection criteria
PHYSICAL LAYER
Introduction to differential transmission
1553B transmission medium
Stubbing
Connecting a terminal to a backbone, long stub
Connection a terminal to a backbone, short stub
Multi-stub couplers
Terminal electrical characteristics
LINK LAYER
Terminal operation
Manchester bi-phase coding scheme
Word formats, SYNC pattern
Word validation
Command word detail
Data word detail
Status word detail, studying various sequences in order to explain Status flags
Terminal architecture, word controller, message controller, frame controller
MESSAGE FORMATS
Remote Terminal operation, assigning an address
The 10 message types
Point-to-point messages
Broadcast messages
Studying various sequences explaining the way of transferring data from terminal to terminal
Message timings, taking into account the round-trip delay
Illegal commands vs invalid commands
MODE CODES
Management messages
Command format, subaddress specific usage
Mode codes supporting data
Dynamic bus control
Synchronize commands, usage to implement a heardbeat
Transmit Status word and Transmit Last command use cases
Interface with self tests in both RT and subsystems
Transmitter shutdown commands used in redundant systems
SYSTEM ISSUES
Using subaddress
Double buffering
Framing in the BC to support both periodic transfers and asynchronous transfers
REDUNDANT DATA BUS REQUIREMENTS
Electrical isolation
Dual standby redundant data bus operation
Superseding commands
High reliability requirements
TESTING
Test plans described in 1553A handbook
Using an analyzer to capture traffic
Generating traffic to check how the system react in case of errors
Data wrap around mechanism, remote loopback test