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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)： | 57/89頁 |
| 文件大?。?/td> | 569K |
| 代理商： | NHI-1598ET/883 |
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59
8.1.3
BC MESSAGE TABLE
A message table is a block of consecutive memory which contains all the components of one
message. These components are:
BC Control word.
BC Command word.
Message gap word.
32 bit time tag( two words).
2nd Command word (RT- RT only).
Data words.
Status word.
2nd Status word( RT- RT only).
In the case of an RT- RT transfer, the second command and status words are also in the
message block as shown. The message block is designed to contain all the information
associated with the message. Parts of the message, the command word for example, are not
segregated into a separate ram area which would complicate reading or writing a message block
by the CPU. The unified message block approach used in the NHi- ET provides faster access to a
message block by the CPU and minimizes overhead.
8.1.4
BC CONTROL WORD
The BC control word is used by the CPU to define parameters in the message and it is used by
the Protocol chip to report information back to the CPU. The following parameters are loaded into
the BC control word by the CPU and used by the protocol chip for a message:
Status bit analysis.
Message bus - A or B.
Local retry actio in the event of an error. If there is no local retry, then the global retry action set in
configuration register 2 is used if an error occurs.
The following information about that message is loaded into the BC control word by the protocol
chip and used by the CPU:
Start of message flag.
No response.
Error.
Status bit set.
Retry attempted.
End of message flag.
8.1.5
BC COMMAND WORD
The command word is any of the 1553 valid commands. This word defines the type of data
transfer in the message BC to RT, RT to BC, RT to RT, or Mode code.
8.1.6
MESSAGE GAP WORD
The message gap word defines delay between the end of the current message and the start of
the next message in the list. The maximum intermessage gap is 4ms with a resolution 1us. The
minimum inter message gap is approximately 8us when the delay is set to 0. The following other
parameters are set in the message gap word:
Message stop on error.
Message stop on status set.
Interrupt on end of message.
NO- OP.
If the NO- OP is set in a message, the message is ignored except for its inter message delay.
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