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參數(shù)資料
| 型號(hào)： | BU-61864F3-122W |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72 |
| 封裝： | 25.40 X 25.40 MM, 3.94 MM HEIGHT, CERAMIC, FP-72 |
| 文件頁(yè)數(shù)： | 25/60頁(yè) |
| 文件大?。?/td> | 457K |
| 代理商： | BU-61864F3-122W |
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31
Data Device Corporation
www.ddc-web.com
BU-6174X/6184X/6186X
F-10/02-300
The current Monitor address is maintained by means of a
counter register. This value may be read by the CPU by means
of the Data Stack Address Register. It is important to note that
when the counter reaches the Stack Pointer address of 0100 or
0104, the initial pointer value stored in this shared RAM location
will be overwritten by the monitored data and ID Words. When
the internal counter reaches an address of FFFF (or 0FFF, for an
Enhanced Mini-ACE/-ACE with 4K RAM), the counter rolls over
to 0000.
WORD MONITOR TRIGGER
In the Word Monitor mode, there is a pattern recognition trigger
and a pattern recognition interrupt. The 16-bit compare word for
both the trigger and the interrupt is stored in the Monitor Trigger
Word Register. The pattern recognition interrupt is enabled by
setting the MT Pattern Trigger bit in Interrupt Mask Register #1.
The pattern recognition trigger is enabled by setting the Trigger
Enable bit in Configuration Register #1 and selecting either the
Start-on-trigger or the Stop-on-trigger bit in Configuration
Register #1.
The Word Monitor may also be started by means of a low-to-high
transition on the EXT_TRIG input signal.
SELECTIVE MESSAGE MONITOR MODE
The Enhanced Mini-ACE/-ACE Selective Message Monitor pro-
vides monitoring of 1553 messages with filtering based on RT
address, T/R bit, and subaddress with no host processor inter-
vention. By autonomously distinguishing between 1553 com-
mand and status words, the Message Monitor determines when
messages begin and end, and stores the messages into RAM,
based on a programmable filter of RT address, T/R bit, and sub-
address.
Third Received 1553 Word
Received 1553 Words and Identification Word
FFFF
Stack Pointer
(Fixed Location - gets overwritten)
0100
Third Identification Word
005
Second Identification Word
0003
Second Received 1553 Word
0002
First Identification Word
0001
First Received 1553 Word
0000
FUNCTION
HEX
ADDRESS
0004
TABLE 43. TYPICAL WORD MONITOR MEMORY
MAP
The selective monitor may be configured as just a monitor, or as a
combined RT/Monitor. In the combined RT/Monitor mode, the
Enhanced Mini-ACE/-ACE functions as an RT for one RT address
(including broadcast messages), and as a selective message mon-
itor for the other 30 RT addresses. The Enhanced Mini-ACE/-ACE
Message Monitor contains two stacks, a command stack and a
data stack, that are independent from the RT command stack. The
pointers for these stacks are located at fixed locations in RAM.
MONITOR SELECTION FUNCTION
Following receipt of a valid command word in Selective Monitor
mode, the Enhanced Mini-ACE/-ACE will reference the selec-
tive monitor lookup table to determine if the particular command
is enabled. The address for this location in the table is deter-
mined by means of an offset based on the RT Address, T/R bit,
and Subaddress bit 4 of the current command word, and con-
catenating it to the monitor lookup table base address of 0280
(hex). The bit location within this word is determined by subad-
dress bits 3-0 of the current command word.
If the specified bit in the lookup table is logic "0", the command
is not enabled, and the Enhanced Mini-ACE/-ACE will ignore
this command. If this bit is logic "1", the command is enabled and
the Enhanced Mini-ACE/-ACE will create an entry in the moni-
tor command descriptor stack (based on the monitor command
stack pointer), and store the data and status words associated
with the command into sequential locations in the monitor data
stack. In addition, for an RT-to-RT transfer in which the receive
command is selected, the second command word (the transmit
command) is stored in the monitor data stack.
The address definition for the Selective Monitor Lookup TABLE
is illustrated in TABLE 44.
SUBADDRESS 4
0(LSB)
TRANSMIT / RECEIVE
1
RTAD_0
2
Logic “0”
RTAD_1
3
RTAD_2
4
RTAD_3
5
RTAD_4
6
Logic “1”
7
Logic “0”
8
Logic “1”
9
Logic “0”
10
Logic “0”
12
Logic “0”
13
Logic “0”
14
Logic “0”
15(MSB)
DESCRIPTION
BIT
11
TABLE 44. MONITOR SELECTION TABLE LOOKUP
ADDRESS
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