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UT1553B Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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9 / 52 page RTI-9 1.4 MIL-STD-1553B Subaddress and Mode Code Definitions 1.5 Remote Terminal Address Assign the RTI remote terminal address by either a software or hardware exercise. The host assigns the RTI remote terminal address by performing a Control Register write; the Terminal Address bus (TA(4:0)) is strobed into the RTI Remote Terminal Address Register upon completion of the Control Register write. To assign the RTI remote terminal address via hardware, use the TALEN/PARITY input pin operating in the terminal latch address enable mode. The Terminal Address bus is latched into the RTI while the TALEN is asserted (i.e., logic low). Valid remote terminal addresses (RTA) include decimal 0 through 31 if Broadcast is disabled, 0 through 30 if Broadcast is enabled Parity Checker An address parity check is performed to insure the remote terminal address applied to TA(4:0) was properly latched into the Remote Terminal Address Register. To perform a parity check, enable the RTI parity circuit via EXT TEST and EXT TST CH SEL A/B input pins. The parity bit is entered through the TALEN/PARITY input pin operating in the parity mode. Input pins EXT TEST and EXT TST CH SEL A/B control dual-function input pin TALEN/PARITY; see table 2 for description of operation. If a parity error exists, the Parity Error bit of the System Register is set to a logic one, biphase Channels A and B are disabled (set to logic zero), the Message Error bit set to logic one, and the message error pin is asserted. Table 1. Subaddress and Mode Code Definitions Per MIL-STD-1553B Subaddress Field Binary (Decimal) Message Format Receive Transmit Description 00000 (00) 1 1 Mode Code Indicator 00001 (01) User Defined User Defined 00010 (02) User Defined User Defined 00011 (03) User Defined User Defined 00100 (04) User Defined User Defined 00101 (05) User Defined User Defined 00110 (06) User Defined User Defined 00111 (07) User Defined User Defined 01000 (08) User Defined User Defined 01001 (09) User Defined User Defined 01010 (10) User Defined User Defined 01011 (11) User Defined User Defined 01100 (12) User Defined User Defined 01101 (13) User Defined User Defined 01110 (14) User Defined User Defined 01111 (15) User Defined User Defined 10000 (16) User Defined User Defined 10001 (17) User Defined User Defined 10010 (18) User Defined User Defined 10011 (19) User Defined User Defined 10100 (20) User Defined User Defined 10101 (21) User Defined User Defined 10110 (22) User Defined User Defined 10111 (23) User Defined User Defined 11000 (24) User Defined User Defined 11001 (25) User Defined User Defined 11010 (26) User Defined User Defined 11011 (27) User Defined User Defined 11100 (28) User Defined User Defined 11101 (29) User Defined User Defined 11110 (30) User Defined User Defined 11111 (31) 1 1 Mode Code Indicator Note: 1. Refer to mode code assignments per MIL-STD-1553B |
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