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| 型號(hào)： | BU-61585S2-400Z |
| 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, CQIP70 |
| 封裝： | 48.30 X 25.40 MM, 4.19 MM HEIGHT, DIP-70 |
| 文件頁數(shù)： | 11/44頁 |
| 文件大小： | 563K |
| 代理商： | BU-61585S2-400Z |
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19
Data Device Corporation
www.ddc-web.com
BU-65170/61580/61585
H1 web-09/02-0
Selective Message Monitor Memory Organization
TABLE 30 illustrates a typical memory map for the ACE in the
Selective Message Monitor mode. This mode of operation
defines several fixed locations in the RAM. These locations allo-
cate in a manner that is compatible with the combined
RT/Selective Message Monitor mode. Refer to TABLE 30 for an
example of a typical Selective Message Monitor Memory Map.
The fixed memory map consists of two Monitor Command Stack
Pointers (location 102h and 106h), two Monitor Data Stack
Pointers (locations 103h and 107h), and a Selective Message
Monitor Lookup Table (0280-02FFh) based on RT Address, T/R,
and subaddress. Assume a Monitor Command Stack size of 1K
words, and a Monitor Data Stack size of 2K words.
Refer to FIGURE 8 for an illustration of the Selective Message
Monitor operation. Upon receipt of a valid Command Word, the
BU-61580 will reference the Selective Monitor Lookup Table (a
fixed
block
of
addresses)
to
check
for
the
condition
(disabled/enabled) of the current command. If disabled, the BU-
61580 will ignore (and not store) the current message; if enabled,
the BU-61580 will create an entry in the Monitor Command
Stack at the address location referenced by the Monitor
Command Stack Pointer.
Similar to RT mode, The ACE stores a Block Status Word, 16-bit
Time Tag Word, and Data Block Pointer in the Message
Descriptor, along with the received 1553 Command Word follow-
ing reception of the Command Word. The ACE writes the Block
Status and Time Tag Words at both the start and end of the mes-
sage. The Monitor Block Status Word contains indications of
message in-progress or message complete, bus channel,
Monitor Data Stack Rollover, RT-to-RT transfer and RT-to-RT
transfer errors, message format error, and other error conditions.
TABLE 24 shows the Message Monitor Block Status Word. The
Data Block Pointer references the first word stored in the Monitor
Data Stack (the first word following the Command Word) for the
current message. The BU-61580 will then proceed to store the
subsequent words from the message (possible second
Command Word, Data Word(s), Status Word(s)) into consecutive
locations in the Monitor Data Stack.
The size of the Monitor Command Stack is programmable to
256, 1K, 4K, or 16K words. The Monitor Data Stack size is pro-
grammable to 512, 1K, 2K, 4K, 8K, 16K, 32K, or 64K words.
Monitor interrupts may be enabled for Monitor Command Stack
Rollover, Monitor Data Stack Rollover, and/or End-of-Message
conditions. In addition, in the Word Monitor mode there may be
an interrupt enabled for a Monitor Trigger condition.
PROCESSOR AND MEMORY INTERFACE
The ACE terminals provide much flexibility for interfacing to a
host processor and optional external memory. FIGURE 1 shows
that there are 14 control signals, 6 of which are dual purpose, for
the processor/memory interface. FIGURES 9 through 14 illus-
trate six of the configurations that may be used for interfacing a
15
13
0
BLOCK STATUS WORD
TIME TAG WORD
DATA BLOCK POINTER
RECEIVED COMMAND
WORD
CONFIGURATION
REGISTER #1
MONITOR COMMAND
STACK POINTERS
MONITOR
COMMAND STACKS
CURRENT
AREA B/A
MONITOR DATA
STACKS
MONITOR DATA
BLOCK #N + 1
MONITOR DATA
BLOCK #N
CURRENT
COMMAND WORD
MONITOR DATA
STACK POINTERS
IF THIS BIT IS "0" (NOT SELECTED)
NO WORDS ARE STORED IN EITHER
THE COMMAND STACK OR DATA STACK.
IN ADDITION, THE COMMAND AND DATA
STACK POINTERS WILL NOT BE UPDATED.
NOTE
SELECTIVE MONITOR
LOOKUP TABLES
SELECTIVE MONITOR
ENABLE
(SEE NOTE)
OFFSET BASED ON
RTA4-RTA0, T/R, SA4
FIGURE 8. SELECTIVE MESSAGE MONITOR MEMORY MANAGEMENT
Monitor Command Stack Pointer B (fixed location)
Monitor Data Stack A
0800-0FFF
Monitor Command Stack A
0400-07FF
Not Used
0300-03FF
Selective Monitor Lookup Table (fixed area)
0280-02FF
Not Used
0108-027F
Monitor Data Stack Pointer B (fixed location)
0107
Not Used
0104-0105
Monitor Data Stack Pointer A (fixed location)
0103
Monitor Command Stack Pointer A (fixed location)
0102
Not Used
0000-0101
DESCRIPTION
0106
TABLE 30. TYPICAL SELECTIVE MESSAGE MONITOR
MEMORY MAP (SHOWN FOR 4K RAM)
ADDRESS
(HEX)
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