CT2566 Datasheet, PDF (13/37 Pages) Aeroflex Circuit Technology – CT2566 MIL-STD-1553 to Microprocessor Interface Unit

* 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
OBTAIN DATA BLOCK
ADDRESS FROM FOURTH WORD
ISSUE BC START TO 1553 DEVICE
READ CONTROL WORD TO
DETERMINE TYPE OF TRANSFER
TRANSFER DATA TO/FROM
1553 BUS (NOTE: RAM NOW
CONTROLLED BY INPUT PINS
CS AND OE
UPDATE BLOCK STATUS WORD
UPDATE TIME TAG
INCREMENT STACK
POINTER BY FOUR.
DECREMENT
MESSAGE COUNT
DATA BLOCK
TRANSFERRED OK
?
NO
YES
STOP ON
ERROR SET
?
YES
NO
MORE MESSAGES
TO SEND
?
NO
ISSUE BC EOM
YES
STOP
* After controller start is issued the subsystem must wait until BCEOM is active
before issuing the next controller start.
Figure 14 – BC Sequence of Operation (Under CT2566 Control)
Aeroflex Circuit Technology
13
SCDCT2566 REV B 8/10/99 Plainview NY [phone]