APPLICATION NOTE #106 CT2525/6/7 Series CT7005/6 Series UNDERSTAN

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APPLICATION NOTE #106 CT2525/6/7 Series CT7005/6 Series UNDERSTAN

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CIRCUIT TECHNOLOGY
APPLICATION NOTE #106
CT2525/6/7 Series CT7005/6 Series UNDERSTANDING WORD
Point Contact: John Vanchieri Tel: (516) 752-2484
APPLICATION NOTE #106
Revised 6/96
CT252X contains 16-bit register, called Built-In-Test (BIT) Word, which records message error terminal status information supplementary that given Status Word. This paper describes Word contents indicates information used. Word used conjunction with mode command `Transmit word' described MIL-STD-1553B document, which states:
subsystem(s)", Word only accessed Controller over 1553 network. error Status Word could then initiate diagnostic recovery routine which would include examination RT's Word. This scenario will discussed later.
WORD CONTENTS
word structured shown Figure entire word contents will 4.3.3.5.1.7.14 Transmit built-in-test (BIT) word. reset logic zero power-up initialization legal mode command This command shall cause transmit status word specified 4.3.3.5.3 followed reset remote terminal. default operation single data word containing data. (ENABLE input high) each will This function intended supplement explained.
available bits status words when hardware sufficiently complex warrant use. data word, containing data, shall altered reception transmit last command transmit status word mode code. This function shall used convey data from associated subsystem(s)
Reserved Reserved Transmitter Timeout Transmitter Timeout Reserved Reserved Shutdown Shutdown Broadcast Transmit Data Rec'd Word Count High Word Count Illegal Mode Command Mode Wrong Loop Test Failure Internal Handshake Failure Transmit Timeout Flag Figure CT252X Word Register
Transmitter Time-out Flag This shall logic transmitter occurs while transmitting. addition, issued legal Initiate Self-Test mode command, this shall transmitter time-out mechanism does operate within range 660µs 800µs. time-out mechanism within transmitter designed operate after 680µs terminal transmission. Internal Handshake This shall logic internal circuitry CT252X does acknowledge request transfer data word time transfer take place correctly. Loop Test Failure times while terminal transmitting, CT252X checks 1553 sync, Manchester, parity, continuity errors. extensive bit-by-bit comparison made complete transmission. shall logic such error transmission detected. This shall also CT252X parity error hard wired address.
CT252X Word provides system designer with information necessary accomplish comprehensive diagnostic routines over 1553 network. Since 1553B states "This function shall used convey data from associated
APPLICATION NOTE #106
Revised 6/96
Mode Wrong This shall reset logic zero reception valid command word with exceptions specified paragraph "BIT Word Reset Exceptions". This shall logic valid mode command received with transmit/receive (T/R) opposite that specified Table paragraph 4.3.3.5.1.7 MIL-STD-1553. Illegal Mode Command This shall reset logic zero reception valid command word with exceptions specified paragraph "BIT Word Reset Exceptions". This shall logic either following conditions arise: valid mode command received with reserved mode codes specified Table paragraph 4.3.3.5.1.7. valid mode command received with broadcast address broadcast option allowed with associated mode code. legality broadcast option specified Table paragraph 4.3.3.5.1.7 each mode code. Word Count This shall reset logic zero reception valid command word with exceptions specified paragraph "BIT Word Reset Exceptions". This shall logic fewer valid data words received than stipulated preceding receive command word.
This shall logic received message longer than stipulated preceding valid command word. Broadcast Transmit Data Received This shall reset logic zero reception valid command word with exceptions specified paragraph "BIT Word Reset Exceptions". This shall logic valid, non-mode command transmit data words received with broadcast address. Shutdown This shall logic been shutdown legal transmitter shutdown mode commands. This shall reset logic zero reopened legal override transmitter shutdown code commands. Shutdown This operates described relates Reserved This reserved function shall logic zero. Reserved This reserved function shall logic zero. Transmitter Time-out This shall logic transmitter timeout occurred Transmitter Time-out This shall logic transmitter timeout occurred
Word Count High This shall reset logic zero reception valid command word Reserved specified paragraph "BIT Word Reset This reserved function shall Exceptions". logic zero.
APPLICATION NOTE #106
Revised 6/96
Reserved This reserved function shall logic zero.
WORD RESET EXCEPTIONS
contents word register shall altered following legal mode commands: Transmit Status Word Transmit Last Command Transmit Word
PRESERVING WORD (when using ENABLE option)
order preserve Transmitter Time-out Flag, Internal Handshake Failure, Word Count High, Word Count Low, Loop Test Failure Bits Word, necessary select DECODE input (hold low). This will prevent resetting those bits Transmit Word Mode Command immediately follows fault, follows Transmit Last Command Transmit Status immediately following fault. will also prevent resetting Bits Status Word. other valid commands will cause those Word bits Status Word bits reset. further information this subject please refer Application Note entitled "Optional Control Subsystem Flag Terminal Flag Bits".
Status bits their related Word bits follows. Expansion Message Error following Word bits used analyze cause message error being RT's status word: mode command having been received with incorrect bit. mode command having been received with reserved mode code illegal broadcast address. valid data words having been received. many valid data words having been received. broadcast command transmit data words having been received. Expansion Subsystem Flag word used determine whether Subsystem Flag internal handshaking failure subsystem itself flagging fault. Expansion terminal Flag following Word bits used analyze cause terminal Flag being set: transmitter time-out error occurred. terminal detected erroneous waveforms while transmitting, hard wired address intermittent incorrect parity.
WORD EXPANSION STATUS WORD
should receive status word with error bits set, would then very easy determine exact cause error immediately requesting RT's Word. Depending results obtained, further diagnostic actions could then performed. explanation
SELF-TEST RESULTS
fails self-test after servicing Initiate Self-Test mode command, Terminal Flag Status Word will set. error source further analyzed presenting with following sequence mode commands: Reset Remote Terminal
APPLICATION NOTE #106
Revised 6/96
Initiate Self Test Transmit Word Bits word then interpreted using Table should noted that self-test forces transmitter time-out mechanism operate. self-test circuitry then checks: That mechanism does operate That mechanism operates correctly.
Table
TIME-OUT TIME-OUT FLAG INTERPRETATION Self-Test aborted superseding valid command Transmitter time-out mechanism inoperative. Self-Test good. Transmitter time-out mechanism operating incorrectly
which self-test command issued.
SUMMARY
This paper attempted answer most commonly asked questions concerning CT252X series hybrids. Forthcoming application notes will address additional hardware concerns software methodology. Information CT252X series, other 1553 data product, obtained calling Applications Dept. (516) 752-2484.
information presented herein best knowledge true accurate. warranty expressed implied made regarding capacity, performance suitability product. strongly urged ensure that information given been superseded.
APPLICATION NOTE #106
Revised 6/96

APPLICATION NOTE #106 CT2525/6/7 Series CT7005/6 Series UNDERSTAN

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