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CT2578-12-XT-P119 Datasheet(PDF) 3 Page - Aeroflex Circuit Technology |
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CT2578-12-XT-P119 Datasheet(HTML) 3 Page - Aeroflex Circuit Technology |
3 / 7 page 3 SCDCT2578 REV B 3/11/98 NRES (Bibirectional IO with pull up resistor) DISCRETE RT STATUS INPUTS Bidirectional reset pin. Interface to this pin should be in the form of an open collector pull down driver. The unit will be reset when a low level input is asserted on power up. The pin is bidirectional in that the unit will drive the signal out low after the status response of the mode code Reset Remote Terminal. Upon reset the unit will be able to respond immediately after the rising edge of NRES. NILLCMD (Input with pull up resistor) Input to illegalize a command to the Remote Terminal with a clear status response. The signal is sampled after NVCR except non mode code receive commands in which case it is sampled after the last data word has been received. A low on this input will illegalize the message, no transfers to / from the subsystem will take place. The device will respond with a clear status unless a bit has been specifically set. No data will be transmitted following status. NVCR (Output) Early indication that the Remote Terminal has received a command and the command word is available on T0-T15. This can be used for message illegalization. NDATA (Output) Access to valid data word in real time. Data word available on T0-T15 during active low signal. NCMDSTRB (Output) This signal indicates that a completely validated message has been received for standard subaddress data activity. Mode commands with or without data will not generate this signal. The NCMDSTRB signal is 8.5 uS long and is an indication that a DMA burst will initiate at the end of NCMDSTRB to transfer words between the 32 word data memory and the subsystem. The Command word is available on T0-T15 during this period. NDATAST (Output) Signal to transfer normal validated received data from the data buffer memory to the subsystem at a rate of 500 nS per word via the T0-T15 highway. NSSTRB (Input with pull up resistor) Signal to transfer normal data for transmission from the subsystem to the data buffer memory at a maximum rate of 1 uS per word via the T0-T15 highway. C1MHZ (Output) Free running 1 MHZ clock to subsystem. NSSTRB must be synchronised to this clock. NENVW (Output) Signal to transfer Vector word from subsystem to unit in response to ‘Transmit Vector Word’ mode command via the T0-T15 highway. NSYNC (Output) Signal to subsystem indicating receipt of a synchronise mode commands If the mode code has an associated data word, it will be available on T0-T15 at this time. If there is no associated data word, T0-T15 will be zero. The following signals are inputs to set the appropriate bits in the Remote Terminals status word. All inputs are sampled after NVCR except non mode code receive commands in which case they are sampled after the last data word has been received. All status inputs are active low. NME (Input with pull up resistor) Message Error, illegalizes message. No transfers to / from the subsystem will take place. No data will be transmitted following the status. NBUSY (Input with pull up resistor) Subsystem Busy. No data will be transferred to / from the subsystem and no data will be transmitted following status for non mode code transfers. NTF (Input with pull up resistor) Terminal Flag. NSR (Input with pull up resistor) Service Request. NSSFLAG (Input with pull up resistor) Subsystem Flag. 1760 SIGNALS NENCHK (Input with pull up resistor) Enables / disables the internal hardware checksum generation and validation. When enabled, the circuitry will check all incoming data for correct checksum and generate the correct checksum word for an outgoing data transfer. “0" = Enable checksum circuitry. “1" = Disable checksum circuitry. STATUS (Open drain output) Open drain output will toggle high or low on each incoming data word from the 1553 data bus provided NENCHK is enabled. When the last data word is received the STATUS line is sampled by the protocol circuitry to determine if the checksum for the message is valid. At the end of the message, if STATUS is low then the checksum is not valid. This STATUS signal can be wired to several different pins to customise the units response to a checksum failure. STATUS can be wired to signals such as NILLCMD and NSR which would cause the message to be illegalized and set Service Request bit in the Status. NHDR (Output) In Mil-Std-1760, the first data word of a message is defined as a Header word. The NHDR signal indicates the presence of the Header word on the T0-T15 highway as it is received. The Header is also stored in the data buffer memory along with the complete message. STREL (Output) When the store is released from the aircraft all the Remote Terminal address inputs go high causing signal STREL to go high. |
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