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參數(shù)資料
| 型號： | BU-65566G13N |
| 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)： | 14/15頁 |
| 文件大?。?/td> | 502K |
| 代理商： | BU-65566G13N |
8
Data Device Corporation
www.ddc-web.com
BU-65566
F-04/06-0
mode command, options regarding Data Word transfers for the
Busy and Message error (illegal) Status word bits, and options
for the handling of 1553A and reserved mode codes.
MONITOR (MT) ARCHITECTURE
The Enhanced Mini-ACE includes three monitor modes:
(1)
A Word Monitor mode.
(2)
A selective message monitor mode.
(3)
A combined RT/message monitor mode.
For new applications, it is recommended that the selective mes-
sage monitor mode be used, rather than the word monitor mode.
Besides providing monitor filtering based on RT address, T/R bit,
and subaddress, the message monitor eliminates the need to
determine the start and end of messages by software. A com-
bined RT/MT mode allows the device to run in both modes of
operation at the same time on the bus.
MT COMMAND STACK
Upon receipt of a valid Command Word, the Enhanced Mini-ACE
will reference the Selective Monitor Lookup Table to determine if
the current command is enabled. If the current command is dis-
abled, the Enhanced Mini-ACE monitor will ignore (and not store)
the current message. If the command is enabled, the monitor will
create an entry in the Monitor Command Stack at the address
location referenced by the Monitor Command Stack Pointer, and
an entry in the monitor data stack starting at the location refer-
enced by the monitor data stack pointer.
MT 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 MT to
the host buffer. The user can poll the host buffer with the
aceMTGetHBufMsgsRaw() function to read the contents of the
host buffer or with the aceMTGetHBufMsgDecoded() function 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 transfer mes-
sages from the Command Stack and Data Stack on the hard-
ware to ensure that no messages are lost. The library transfers
messages reliably to the host buffer with no intervention from the
user.
MONITOR INTERRUPTS
Selective monitor interrupts may be issued for End-of-message
and for conditions relating to the monitor command stack pointer
and monitor data stack pointer, such as Command Stack 50%
Rollover, Command Stack 100% Rollover, Data Stack 50%
Rollover, and Data Stack 100% Rollover.
The Enhanced Mini-ACE API library can be used to configure an
MT 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.
SOFTWARE
The BU-69090 series Enhanced Mini-ACE software is a High-
Level ANSI C language based API library of functions that pro-
vides comprehensive support for all of DDC's Enhanced Mini-
ACE cards. The software package also includes device drivers
for Windows 9x/2000/XP, Windows NT, Linux, and VxWorks. The
base library consists of a suite of function calls that serves to
offload a great deal of low-level tasks from the application pro-
grammer. This includes register initialization, along with memory
management software, and the means to implement an offline
development environment.
As a means of supporting operation on multiple platforms, the
BU-69090 library is written in ANSI C, and leverages component
object modeling (COM). The use of ANSI C and component
object modeling provides portability to different operating sys-
tems and card types. As a result, the library may be easily port-
ed to run on platforms based on a variety of microprocessors,
running under different operating systems or in some cases no
operating system.
15
Odd
Parity
14
Op Code Field
13
12
11
10
9
0
8
1
7
0
6
1
5
0
4
Condition Code Field
3
2
1
0
FIGURE 3. BC OP CODE FORMAT
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