參數(shù)資料
型號(hào)： 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)： 63/89頁
文件大?。?/td> 569K
代理商： NHI-1598ET/883
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65
formats are illustrated in a later section of this manual. The unified message block approach
again used in the Message monitor to provide faster access to a message block by the CPU and
minimizes overhead.
8.2.4
MESSAGE MONITOR TAG WORD
The ET loads the Message monitor tag word with information about the message received. This
information is used by the CPU to analyze the message. The following parameters are loaded
into the Monitor tag word by the ET:
Start of message flag.
Data error - Data word( s) contained error( s).
Command 1 error - Comand word contained error( s).
Command 2 error - Second command word of an RT- RT command contained error( s).
Over lap - A message was detected on the alternate bus before the current message was
Completed. The Message monitor aborts processing the current message, switches to
the alternate bus and begins processing the new message.
Sync error - A contiguous data word had a command sync.
Bus A- B.
RT- RTcommand - Message was an RT- RT command.
End of message flag.
8.2.5
COMMAND WORD OR STATUS WORD
This is the Command or Status word associated with the message.
8.2.6
DATA WORD( S)
These are the data word( s) associated with the message.
8.2.7
MESSAGE MONITOR EXAMPLE
Setting up and Implementing the MESSAGE monitor!
Put address of message list in FRAME REG.
Put address of 1st message table in 1st location of message list.
Put message list size in FRAME LENGTH REG.
Set end of MESSAGE LIST options in FRAME LENGTH REG.
Select end of MESSAGE LIST interrupt in FRAME LENGTH REG.
Set the address Masks in REG's 22 and 26.
Select tag word option in REG 21.
Select time tag option in REG 21.
Select MESSAGE monitor in REG 9.
Start monitor in REG 9.
The monitor now collects messages until the message list size is reached. The selected End- of-
Message List option is executed and an interrupt is issued if enabled.
The CPU can now read the entire message list. Each word in the message list is the address of a
data block stored in ram. The first word in the block is the Tag Word associated with that
message.
8.3.0
WORD MONITOR APPLICATIONS
The NHi-ET Word Monitor operation collects data on a word- by- word basis . Each word that is
received and stored in the ram can have an associated tag word and/ or an associated 32 bit time
tagged The number of operations required to initialize the device and to examine results of a data
message transfer has been minimized.
The Word Monitor function of the NHi-ET employs registers embedded in the protocol chip and its
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