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CT2565-201-1 Datasheet(PDF) 11 Page - Aeroflex Circuit Technology |
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CT2565-201-1 Datasheet(HTML) 11 Page - Aeroflex Circuit Technology |
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11 / 31 page  Aeroflex Circuit Technology 11 SCDCT2565 REV B 8/10/99 Plainview NY (516) 694-6700 CMD RTA P STAT RTA P DATA LCMD P CTL CMD LOOP STAT LCMD EOM (57) 900ns 5.0±0.5µs INCMD (9) LWORD (29) D0 - D15 1553 BUS BUSREQ (19) ADRINC (49) 80/166ns 70/80µs 400/500ns Figure 10 – BC Mode Code Transmit Last Command (10010) Timing CMD RTA P CTL CMD LOOP STAT EOM (57) 900ns INCMD (9) LWORD (29) D0 - D15 1553 BUS BUSREQ (19) ADRINC (49) 80/166ns 50/80µsec 400/500ns Figure 11 – BC Mode Code Transmit Status Word (00010) Timing STAT RTA P 40/60µsec Notes: All timing is typical unless otherwise noted. RTU Operation Each RTU is assigned a unique address on the 1553 bus. It processes commands issued by the BC to its address or through Broadcast commands. Upon receipt of a valid command in the RTU mode, the CT2565 will attempt to (1) transfer 1553 data received to the subsystem, (2) read data from the subsystem for transmission on the 1553 bus, (3) transmit status information to 1553, or (4) set status conditions. All data block transfers are accompanied by a 1553 Status Word. Figure 12 details a RTU single message transfer. RTU Address RTU Address pins 33-34 and 72-74 and Address Parity pin (odd parity) should be programmed to a unique RTU (1553) address. These inputs have internal pull-ups and will default a high state if left unconnected. The CT2565 will not respond if odd parity is compromised (See Error Handling). RTU Initialization Initialize the CT2565 as an RTU per Table 2. Upon receipt of valid command word from the serial bus (RTU addressed or broadcast CMD), the CT2565 will pulse NBGRNT (New Bus Grant) pin 42 low. |
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