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CT2565-201-1 Datasheet(PDF) 4 Page - Aeroflex Circuit Technology |
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CT2565-201-1 Datasheet(HTML) 4 Page - Aeroflex Circuit Technology |
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4 / 31 page  Aeroflex Circuit Technology 4 SCDCT2565 REV B 8/10/99 Plainview NY (516) 694-6700 DMA- Type Handshake All BC and RT word transfers are preceded by a request-grant-acknowledge format DMA handshake procedure. Timing information is provided in BC, RTU and MT sections. In MT mode, the 1553 transmission is transferred along with an identification Word using a single DMA handshake containing two memory-write operations. The DMA format requires that the subsystem provide a bus grant (BUSGRNT pin 45) low within a timeout period. Note that BUSGRNT should be set to logic "1" before another bus request (BUSREQ) is issued. Memory Read/Write With the single exception of an RT command word transfer, all subsystem transfers take the form of a static memory read or write. A low pulse on both the chip select (CS) and output enable (OE) or a low pulse on CS and write enable (WE) (pins 17, 18 and 44 respectively) indicates data is valid on the parallel data bus for the duration of the pulse. The rising edge of CS triggers an address increment (ADRINC pin) low output pulse used to increment the subsystem memory address for successive transfers. BC OPERATION In the BC mode, the CT2565 initiates all MIL-STD-1553 data and control message transfers. Figure 3 details specific message transfer flow and Table 3 lists subsystem memory allocation. The subsystem, or host processor, must provide a CT2565 protocol Control Word (See Figure 4) and MIL-STD-1553 command and data words. The CT2565 will transfer the RTU status response and provide message transfer validation during an active transfer. All parallel word transfers occur in the form of a DMA (request-grant-acknowledge) handshake with memory read or operation as shown in Figures 5 and 6. Command Transfer In the BC mode pulse BCSTART (pin 41) low. Following the pulse, the CT2565 will initiate a DMA handshake and memory read for; the control, word, command word(s) and up to 32 data words. No handshake timeout is enforced in the BC mode (CT2565) remains idle during BUSREQ to BUSGRNT), however 1553 protocol must be maintained. Note that commands are named from the BC's point-of-view (for example, a TRANSMIT CMD indicates the addressed RTU must transmit data). BIT TIMES 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 COMMAND WD 5 5 5 1 SYNC REMOTE TERMINAL T/R SUBADDRESS DATA WORD P ADDRESS MODE COUNT/MODE CODE DATA WORD 16 1 SYNC DATA P STATUS WORD 5 1 1 1 3 1 1 1 1 1 1 SYNC REMOTE TERMINAL RESERVED ADDRESS PARITY TERMINAL FLAG DYNAMIC BUS CONTROL ACCEPTANCE MESSAGE ERROR INSTRUMENTATION SUBSYSTEM FLAG SERVICE REQUEST BUSY Note: T/R – Transmit/Receive, P – Parity BROADCAST COMMAND RCVD Figure 2 – MIL-STD-1553 Word Types MODE RT/BC (PIN 1) MT (PIN 2) BC 0 1 RT 1 1 MT 0 0 Table 2 – Operating Modes |
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