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CT2566 датащи(PDF) 13 Page - Aeroflex Circuit Technology |
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CT2566 датащи(HTML) 13 Page - Aeroflex Circuit Technology |
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13 / 37 page ![]() Aeroflex Circuit Technology SCDCT2566 REV B 8/10/99 Plainview NY (516) 694-6700 13 CONTROLLER START COMMAND RECEIVED READS STACK POINTER LOAD BLOCK STATUS WORD INTO FIRST WORD OF DESCRIPTOR STACK ENTRY (SET SOM BIT IN BLOCK STATUS WORD) LOAD TIME TAG INTO SECOND WORD OF DESCRIPTOR STACK ENTRY ADDRESS FROM FOURTH WORD OBTAIN DATA BLOCK ISSUE BC START TO 1553 DEVICE DETERMINE TYPE OF TRANSFER READ CONTROL WORD TO UPDATE BLOCK STATUS WORD UPDATE TIME TAG INCREMENT STACK POINTER BY FOUR. DECREMENT MESSAGE COUNT TRANSFERRED OK DATA BLOCK ? TRANSFERRED OK STOP ON ? ERROR SET YES NO NO YES NO MORE MESSAGES ? TO SEND YES ISSUE BC EOM STOP Figure 14 – BC Sequence of Operation (Under CT2566 Control) TRANSFER DATA TO/FROM 1553 BUS (NOTE: RAM NOW CONTROLLED BY INPUT PINS CS AND OE * * After controller start is issued the subsystem must wait until BCEOM is active before issuing the next controller start. |
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