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参数资料
| 型号： | BU-65743F3-210 |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP80 |
| 封装： | 0.880 INCH, CERAMIC, QFP-80 |
| 文件页数： | 33/75页 |
| 文件大小： | 532K |
| 代理商： | BU-65743F3-210 |
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39
Data Device Corporation
www.ddc-web.com
BU-65743/65843/65863/65864
D-06/04-0
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 PCI Mini-ACE Mark3/Micro-ACE TE will reference the
selective monitor lookup table to determine if the particular com-
mand is enabled. The address for this location in the table is
determined 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 PCI Mini-ACE Mark3/Micro-ACE TE will
ignore this command. If this bit is logic "1", the command is
enabled and the PCI Mini-ACE Mark3/Micro-ACE TE will create
an entry in the monitor 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.
NOTE: After a command is discarded the monitor will immedi-
ately look for another "Command." Where only a subset of
Subaddresses are enabled, it is possible that a succeeding
Status words may be captured as a "Command". This will always
be flagged as an error because the Word Count or timing will fail.
The address definition for the Selective Monitor Lookup TABLE is
illustrated in TABLE 60.
SELECTIVE MESSAGE MONITOR MEMORY
ORGANIZATION
A typical memory map for the PCI Mini-ACE Mark3/Micro-ACE
TE in the Selective Message Monitor mode, assuming a 4K RAM
space, is illustrated in TABLE 61. This mode of operation defines
several fixed locations in the RAM. These locations are allocated
in a way in which none of them overlap with the fixed RT loca-
tions. This allows for the combined RT/Selective Message
Monitor mode.
The fixed memory map consists of two Monitor Command Stack
Pointers (locations 102 and 106 hex), two Monitor Data Stack
Pointers (locations 103 and 107 hex), and a Selective Message
Monitor Lookup Table (locations 0280 through 02FF hex).
For this example, the Monitor Command Stack size is assumed
to be 1K words, and the Monitor Data Stack size is assumed to
be 2K words.
FIGURE 10 illustrates the Selective Message Monitor operation.
Upon receipt of a valid Command Word, the PCI Mini-ACE
Mark3/Micro-ACE TE will reference the Selective Monitor Lookup
Table to determine if the current command is enabled. If the cur-
rent command is disabled, the PCI Mini-ACE Mark3/Micro-ACE
TE 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 referenced by the Monitor Data Stack
Pointer.
The format of the information in the data stack depends on the
format of the message that was processed. For example, for a
BC-to-RT transfer (receive command), the monitor will store the
command word in the monitor command descriptor stack, with
the data words and the receiving RT's status word stored in the
monitor data stack.
The size of the monitor command stack is programmable, with
choices of 256, 1K, 4K, or 16K words. The monitor data stack
size is programmable with choices of 512, 1K, 2K, 4K, 8K, 16K,
32K or 64K words.
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. The latter, which are shown in FIGURE
8, include Command Stack 50% Rollover, Command Stack 100%
Rollover, Data Stack 50% Rollover, and Data Stack 100% Rollover.
The 50% rollover interrupts may be used to inform the host proces-
sor when the command stack or data stack is half full. At that time,
the host may proceed to read the received messages in the upper
half of the respective stack, while the PCI Mini-ACE Mark3/Micro-
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 60. MONITOR SELECTION TABLE LOOKUP
ADDRESS
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