CT2566 Aeroflex Circuit Technology, CT2566 Datasheet - Page 16

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

MT Operation
Configuration Register to logic "0" and bit 14 to a
logic "1"
Command.
Stack (See Table 5) and the setups shown in Figure 18
are followed. The user instructs the CT2566 where to
store the first received 1553 word by loading the
starting word address in the Stack Pointer. Once a
Controller Start command is issued, the CT2566 will
store this value in the internal Address Register.
additional information regarding the received 1553
word, its format is shown in Figure 19. This information
allows the user to develop algorithms to restructure the
message transfers. External Logic can be used for
triggering on specific commands or subaddresses. For
further information, consult factory.
for every word that is transferred across the 1553 Data
Bus. The CT2566 stores the received 1553 word in the
RAM location indicated by the internal Address
Register. The contents of this register are incremented
by one so that it points to the next word in RAM, and
the Identification Word is stored at that location. The
internal Address Register is then incremented by one
again, in preparation for storing the next Identification
Aeroflex Circuit Technology
MT Initialization
The MT mode is selected by setting bit 15 of the
For MT operations, the entire RAM is used as the MT
The identification Word provides the CPU with
The 1553 device will generate an Identification Word
along
Figure 18 – MT Initialize
SET CONFIGURATION REGISTER
(under user control)
INITIALIZE STACK POINTER
ISSUE RESET COMMAND
ISSUE START COMMAND
with
TO MT MODE
CLEAR RAM
START
issuing
a
Controller
Start
16
Word. The RAM automatically wraps around (from
location FFFF to location 0000), shown in Figure 20.
CPU each time it reads the associated data word into
CPU memory. This provides a simple method of
keeping track of words that have been processed by
the CPU.
Bit 7 of the Identification Word can be reset by the
Figure 20 – MT Sequence of Operation
1553 CHANNEL A/B
Note: Each bit of the GAP TIME field
ERROR (1 = ERROR, 0 = GOOD STATUS)
WORD GAP
COMMAND SYNC
SET TO "1"
SET TO "0"
Figure 19 – MT Identification Word
represents .5µs.
15
1
(under CT2566 control)
IN RAM, INCREMENTS INTERNAL
STORE IN INTERNAL REGISTER
STORE RETREIVED 1553 WORD
IN RAM, INCREMENT INTERNAL
STORE IDENTIFICATION WORD
GET STACK POINTER FROM
GAP TIME
START COMMAND ISSUED
WORD 100 IN RAM AND
WORD TRANSFERRED
ADDRESS REGISTER
ADDRESS REGISTER
ACROSS 1553 BUS
SCDCT2566 REV B 8/10/99 Plainview NY [phone]
?
YES
8 7
1 1 1
NO
0