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參數(shù)資料
| 型號： | BU-65566M19 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4 CHANNEL(S), MIL-STD-1553 CONTROLLER, XMA64 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 502K |
| 代理商： | BU-65566M19 |
7
Data Device Corporation
www.ddc-web.com
BU-65566
F-04/06-0
End-of-(every)Message, Message Error, Selected (transmit or
receive) Subaddress, 100% Circular Buffer Rollover, 50%
Circular Buffer Rollover, 100% Descriptor Stack Rollover, 50%
Descriptor Stack Rollover, Selected Mode Code, Transmitter
Timeout, Illegal Command, Interrupt Status Queue Rollover, End
of Frame, and any user defined interrupt.
The Enhanced Mini-ACE API library can be used to configure the
RT to generate interrupts and reliably transfer messages and
data to the host buffer (if enabled in software) to guarantee that
data will not be lost. The library also allows for users to create an
ISR that will execute at any of the selected interrupt conditions.
OTHER RT FEATURES
The Enhanced Mini-ACE provides an internal mechanism for RT
Command Word illegalizing. The design of the BU-65566 sup-
ports two different options for specifying the RT addresses for
the individual Enhanced Mini-ACE's: (1) by means of the RT
ADDRESS (and PARITY) inputs, that are brought out to the
card's Pn4 connector, and latched under host software control;
or (2) fully software programmable by the host, by means of an
internal register. In both configurations, the RT address is read-
able by the host processor.
The Enhanced Mini-ACE includes options for the Terminal flag
status word bit to be set either under software control and/or
automatically following a failure of the loopback self-test. Other
software programmable RT options include software program-
mable RT status and RT BIT words, automatic clearing of the
Service Request bit following receipt of a Transmit vector word
RT COMMAND STACK
The command stack provides a chronology of all messages
processed by the Enhanced Mini-ACE RT. Similar to BC mode,
there is a four-word block descriptor in the Stack for each mes-
sage processed. The four entries to each block descriptor are the
Block Status Word, Time Tag Word, the pointer to the start of the
message's data block, and the 16-bit received Command Word.
RT HOST BUFFER
The Enhanced Mini-ACE API library software allows for the cre-
ation of a circular software host buffer. The software library will
automatically log all messages and data processed by the RT to
the host buffer. The user can poll the host buffer with the
aceRTGetHBufMsgsRaw() to read the contents of the host buffer
or with the aceRTGetHBufMsgDecoded() to read one message
at a time. This function will read one message from the host
buffer and parse all relevant information into a library structure to
separate the command word, data words, and all other parts of
a 1553 message. The creation of a host buffer is commonly used
in non-deterministic operating systems such as Windows so that
a buffer exists for the library to reliably transfer messages from
the Command Stack and Data Stack on the hardware to ensure
that no messages are lost. The library transfers messages reli-
ably to the host buffer with no intervention from the user.
RT INTERRUPTS
The Enhanced Mini-ACE offers a great deal of flexibility in terms
of RT interrupt processing. By means of the Enhanced Mini-
ACE's two Interrupt Mask Registers, the RT may be programmed
to issue interrupt requests for the following events/conditions:
OP CODE
DATA BLOCK
MESSAGE
CONTROL/STATUS
PARAMETER
(POINTER)
BLOCK
BC INSTRUCTION
LIST
BC INSTRUCTION
LIST POINTER REGISTER
BC CONTROL
WORD
COMMAND WORD
(Rx Command for
RT-to-RT transfer)
DATA BLOCK POINTER
TIME-TO-NEXT MESSAGE
TIME TAG WORD
BLOCK STATUS WORD
LOOPBACK WORD
RT STATUS WORD
2nd (Tx) COMMAND WORD
(for RT-to-RT transfer)
2nd RT STATUS WORD
(for RT-to-RT transfer)
INITIALIZE BY REGISTER
0D (RD/WR); READ CURRENT
VALUE VIA REGISTER 03
(RD ONLY)
FIGURE 2. BC MESSAGE SEQUENCE CONTROL
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