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參數(shù)資料
| 型號： | NHI-1598ET/883 |
| 廠商： | NATIONAL HYBRID INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), MIL-STD-1553 CONTROLLER, CPGA69 |
| 封裝： | 1.100 X 1.100 INCH, CERAMIC, PLUG IN, PGA-69 |
| 文件頁數(shù)： | 28/89頁 |
| 文件大?。?/td> | 569K |
| 代理商： | NHI-1598ET/883 |
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33
The T/R bit subaddress and word count fields in the Command word are used to index into the
Pointer table as defined below:
INDEX
T/R
SUBADDRESS
MODE CODE
COMMAND TYPE
0
NOT USED
1 - 30
0
1 – 30
RECEIVE/BROADCAST
31
0
31 (Note 2)
32
NOT USED
33 - 62
1
1 – 30
TRANSMIT
63
1
31 (Note 2)
TRANSMIT
64 - 95
X
0, 31(Note 2)
0 - 31
MODE CODE
96
NOT USED
97 - 126
0
1 – 30
BROADCAST
127
0
31 (Note 2)
BROADCAST
Note 1: Separate Broadcast Pointers are activated when BIT "0" of CONFIGURATION
REGISTER 1 is a "1" (See this register for details).
Note 2: When 3818A/ 1553A protocol option is enabled, subaddress 31 is an extend
subaddress, Not a Mode Code Flag.
4.3.1
MESSAGE ILLEGALITY
Commands are illegalized by setting the address field of the corresponding data table pointer to
0. When the protocol chip receives an illegal command, it responds with ME= 1 in the status; in
addition, data transmission and storage are suppressed. All undefined mode commands are
ignored.
4.3.2
REMOTE TERMINAL DATA TABLE TAG WORD
The data table's first word can be defined to be either a data word or a TAG WORD (see the
NTAG field in the CONTROL register) which defines the table's status and associated options.
The TAG WORD has the following format:
15
14
13
12
11
10
9
8
UPDATE
SSFENA
BCST
X
PULSE3
PULSE2
PULSE1
PULSE0
7
6
5
4
3
2
1
0
LOCK
INVALID
OVRWRT
WCNT4
WCNT3
WCNT2
WCNT1
WCNT0
UPDATE
Bits: 15
1= Indicates that the table was updated with data by the CPU or a bus message. The
CPU should set this bit after writing to the table and reset the bit after reading the
table.
SSFENA
Bits: 14
1= Enables setting the subsystem flag in the status word whenever the RT transmits
stale data or overwrites received data (i. e., whenever data is transmitted from a
table with UPD= 0, or is stored into a table with UPD= 1).
BCST
Bits: 13
1= Indicates that the table contains data from a valid broadcast message.
0= Indicates that the table contains data from a non- broadcast message.
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