CT2566 Aeroflex Circuit Technology, CT2566 Datasheet - Page 15

• Manufacturer Part Number: CT2566
• Description: CT2566 MIL-STD-1553 to Microprocessor Interface Unit
• Manufacturer: Aeroflex Circuit Technology

CT2566 received an EOM pulse and then performs the
following:
Aeroflex Circuit Technology
RTU EOM Sequence
At the end of a 1553 message (valid or invalid) the
4. Stores the Command Word received.
5. Reads a Block address from the Look-Up Table
1. Updates the Block Status Word.
2. Updates the Time Stage if used.
3. Increments the Stack Pointer by four.
4. Generates an Error Interrupt if enabled.
Figure 17 – RTU Sequence of Operation
using the T/R bit and the subaddress from the
Command Word; transfers the Block address into
the address register. Data words are transferred
to/from memory by the associated 1553 interface
unit using the address register.
GENERATE EOM INTERRUPT AND
(under CT2566 control)
UPDATE BLOCK STATUS WORD
READ LOOK-UP TABLE USING
ERROR INTERRUPT IF ERROR
UPDATE DESCRIPTOR STACK
INCREMENT STACK POINTER
BLOCK STATUS WORD, TIME
T/R SUBADDRESS CURRENT
TRANSFER DATA TO/FROM
TAG AND COMMAND WORD
1553 INTERFACE DEVICE
1553 COMMAND WORD
READ STACK POINTER
MESSAGE COMPLETE
CONDITION DETECTED
AND TIME TAG
AREA BIT B/A
RECEIVED
BY FOUR
EXIT
?
YES
NO
15
RECEIVED COMMAND WORD
XXXXX
XXXXX
XXXXX
XXXXX
XXXXX
ADDR T/R SUBADD
RTU
RTU Initialization (under user control)
Figure 16 – RTU Look-up Table
0
0
0
1
1
00000
00001
00010
11110
11111
DATA BLOCK ASSIGNMENTS
INITIALIZE STACK POINTER
SET UP LOOK-UP TABLE(S)
WAIT FOR 1553 COMMAND
REGISTER TO RTU MODE
ISSUE RESET COMMAND
INITIALIZE INTERRUPT
SET UP DATA BLOCKS
COUNT
XXXXX
XXXXX
XXXXX
XXXXX
XXXXX
SET CONFIGURATION
WORD
SCDCT2566 REV B 8/10/99 Plainview NY [phone]
MASK REGISTER
Figure 15
START
LOOK-UP TABLE
USER DEFINED 0140
USER DEFINED
USER DEFINED
USER DEFINED 017E
USER DEFINED
0141
0142
017F
}
LOCATIONS
64