APPLICATION NOTE #111 CT2577 Identifying Remote Terminal Address

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APPLICATION NOTE #111 CT2577 Identifying Remote Terminal Address

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CIRCUIT TECHNOLOGY
APPLICATION NOTE #111
CT2577 Identifying Remote Terminal Address Using "Built Self Test"
Point Contact: John Vanchieri Tel: (516) 752-2484
APPLICATION NOTE #111
Released 11/99
Identifying Remote Terminal Address Using "Built Self Test"
Some system environments require that applications 1553 Modules Remote Terminal Address (RTA) identified when system initialized. CT2577/9 series perform this function utilizing devices internal Self test capabilities. This affords high degree functional coverage along with, when required, identifying RTA.
BASICS CT2577/79 SELF TEST FUNCTION
Self test feature internal (off-line) external (on-line) loop back test additional verification functionality. This addition Remote Terminals internal Wraparound circuitry. difference being that this test manual under subsystem control. subsystem microprocessor selects either off-line on-line mode, initializes Self test data then initiates Self test. After Self test completed subsystem then reads back wrapped data word determines correct. on-line Self test must done with 1553 data quiet. more detailed description CT2577/79 Built Self test please refer application note #110, Using CT2577/79 Built Self Test.
APPLICATION NOTE #111
Released 11/99
PERFORMING SELF TEST
Self test function enabled disabled writing specific address locations (data don't care). Reset (pulsing NRES) will disable Self test. Addresses shown operation Address 406h 407h 408h Function Enable off-line Self test device status Enable on-line Self test device status Disable Self test
When mode used (NBIT16=1) upper lower bytes selected (0=lower byte) must asserted along with address highway. through contain data, through used. recommended that user always word width operations accessing upper byte then lower byte operations.
TYPICAL SEQUENCE EVENTS
following sequence used identify CT2577/79 Terminal Address assumes that with correct parity (odd) Latch Address input (LA) low. Issue Reset (pulse NRES). Initialize desired operating mode (W=Write, R=Read, address/data) 400h/XXXX Mode) 401h/XXXX Mode) Select Self test mode 406h/XXXX (off-line) 407h/XXXX (on-line) Verify Self test mode (Assumes disabled) 001h/XX40h (off-line) 001h/XX80h (on-line) Select used 010h/XXXX (Primary) 018h/XXXX (Secondary) Write Self test Data word (ST-Data, A55Ah typically used) 020h/ST-Data Write Command word (Start from 00h) 000h/0021h (RT0 WC1)
APPLICATION NOTE #111
Released 11/99
Broadcast commands this particular function RTA's would PASS Self test defeating intent scenario. used convenience, Receive substituted subsequent iterations increment field Self test Command word. range 1Eh. Command 0021h 0000 0000 0010 0001 When decoded into established 1553 groups Command 0021h 00000 00001 00001 Clear Self test Data location. Should performed immediately following Command word write (step 020h/0000h This location will overwritten with Self test data must altered insure that when finally read Self test data actually written Verify Cleared Self test data location 020h/0000h Wait 45µs Self test complete (after NCMDSTRB) Read Self test data 020h/0000h Wrong RTA) ST-Data matches) While equal 0000h step When ST-Data data returned field Self test command word equals terminals hardwired RTA. Disable Self test 408h/XXXX Verify Self test disabled (assumes disabled) 001h/0000h Proceed with normal system functions
APPLICATION NOTE #111
Released 11/99

APPLICATION NOTE #111 CT2577 Identifying Remote Terminal Address

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