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CT2553 Datasheet(PDF) 20 Page - Aeroflex Circuit Technology |
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CT2553 Datasheet(HTML) 20 Page - Aeroflex Circuit Technology |
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20 / 36 page  Aeroflex Circuit Technology 20 SCDCT2553 REV B 8/6/99 Plainview NY (516) 694-6700 MT DATA STORAGE. Figure 26 shows the steps in a MT data Storage operation. INTERRUPTS: SA/MC - 0 (pin 13), SA/MC - 1 (pin 52) and SA/MC - 2 (on 52) represents B6, B7, and B8 counter outputs in the MT mode. B6 counts every 32 words transferred, B7 every 64 words, and B8 every 128 words. These counter outputs can be used to generate interrupts to the subsystem to insure proper servicing of Memory. The Data Word and Identification Word transfers increment the counter by two. BUILT-IN-TEST WORD (RTU MODE) The CT2553 contains a 14 bit Built-In-Test (BIT) word register which stores information about the condition of the RTU. When a Mode Command is received to transmit BIT word, the contents of this register are transmitted over the 1553 data bus. Figure 27 shows the meaning of each bit in the BIT register. Information is included regarding transmitter timeouts, loop test failures, transmitter shutdown, subsystem handshake failure, and the results of individual message validations. MODE CODES The CT2553 implements all mode codes applicable to dual redundant systems. Mode codes can also be illegalized using the appropriate I/O signals. Mode command illegalization and handling are detailed in the RTU Operation section and listed in Table 6. GET STACK POINTER FROM WORD 100 IN RAM AND STORE IN INTERNAL REGISTER START COMMAND ISSUED STORE RETREIVED 1553 WORD IN RAM, INCREMENTS INTERNAL ADDRESS REGISTER Figure 26 – MT Data Storage Operation STORE IDENTIFICATION WORD IN RAM, INCREMENT INTERNAL ADDRESS REGISTER NO WORD TRANSFERRED ACROSS 1553 BUS ? YES 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 CHAN B XMITTER TIMEOUT CHAN A XMITTER TIMEOUT CHAN B LOOP TEST FAILURE CHAN A LOOP TEST FAILURE CHAN B XMITTER SHUTDOWN CHAN A XMITTER SHUTDOWN NON-MODE BROADCAST CMD TO XMIT MESSAGE HIGH WORD COUNT MESSAGE LOW WORD COUNT ILLEGAL MODE CODE OR ILLEGAL BROADCAST WITH MODE CODE MODE CODE OR T/R ERROR CHAN A/B LOOP TEST FAILURE HANDSHAKE FAILURE CHAN A/B XMITTER TIMEOUT Notes: (1) Bits 0-2 and 10-13 are latched and only cleared by a mode reset command or a master RESET. (2) Bits 3-7 are cleared at the start of each new message and updated at the end of the message. They reflect the present command word. (3) Bits 8-9 are set by the mode command for Transmitter Shutdown and are cleared by the mode command for Override Transmitter Shutdown, Reset RT or a master RESET. Figure 27 – Built-In-Test Word (RTU Mode) |
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