參數(shù)資料
型號: CT2565-FP
廠商: Aeroflex Inc.
英文描述: CT2565 Bus Controller, Remote Terminal and BUS Monitor FOR MIL-STD-1553B
中文描述: CT2565總線控制器,遠程終端和總線監(jiān)測的MIL - STD - 1553B總線
文件頁數(shù): 13/31頁
文件大?。?/td> 356K
代理商: CT2565-FP
Aeroflex Circuit Technology
13
SCDCT2565 REV B 8/10/99 Plainview NY (516) 694-6700
Mode Code Illegalization (Optional)
The word count and TX/RX pins will be latched
800ns (typ) after the falling edge of NBGRNT
(See Figure 13, RTU Command Word Handling).
Table 5 lists the CT2565 pins associated with
mode code illegalization. If the current command
is a mode code, LMC (pin 55) will go high. Mode
codes can be illegalized, using an external PROM
(<200ns access time recommended), by setting
ILLCMD low after the NBGRNT flag. This will set
the message error (status word) and illegal Mode
Code (BIT word) bits followed by transmission of
the status word. Using the method, mode
commands can be "auto-screened" without
interrupting subsystem operation. For a complete
list of mode codes, refer to Table 8.
Table 5 – Mode Code Illegalization
PIN #
SYMBOL
DESCRIPTION
51
WC0
Word Count LSB
12
WC1
Word Count 1
52
WC2
Word Count 2
13
WC3
Word Count 3
53
WC4
Word Count MSB
15
T/R
TX/RX
Note: A word count field of all 0’s indicates 32 data words; all 1’s
= 31 words.
SYM
DESCRIPTION
MIN
TYP
MAX
UNITS
Illegalize
t1
NBGRNT pulse width
151
-
181
ns
t2
NBGRNT to LMC delay
500
-
667
ns
t3
LMC to WC-T/R latch
-
200
-
ns
t4
LMC to ILLCMD latch
-
-
333
ns
Legal
t5
NBGRNT to INCMD delay
-
1.0
1.5
μs
t6
BUSACK to SOM delay
-
166
-
ns
t7
SOM pulse width
-
166
-
ns
t8
CMD VALID setup
60
-
100
ns
Status Inputs
t9
NBGRNT low to status latch
-
-
3
μs
Note: Memory read/write signals CS, OE, and ADRINC remain static at logic "1".
Figure 13 – RTU Command Word Handling/Status Inputs
NBGRNT
(42)
STATUS INPUTS
BUSACK
(59)
LMC (55)
BUSREQ
(19)
DBACCEPT
,
SSFLAG
,
SVCREQ
,
SSER
and
SSBUSY
INPUTS
LATCHED
CMD VALID
LATCHED UNTIL NEXT VALID COMMAND WORD RECEIVED
VALID UNTIL NEXT VALID COMMAND WORD RECEIVED
t
1
t
2
t
3
t
5
t
6
t
7
t
8
t
9
t
4
D0 - D15
INCMD
(9)
SOM
(78)
ILLCMD
(48)
WC
0-4
T/R
(15)
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