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參數(shù)資料
| 型號： | BU-65527M4-200 |
| 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, XMA |
| 文件頁數(shù)： | 4/32頁 |
| 文件大小： | 2094K |
| 代理商： | BU-65527M4-200 |
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12
Data Device Corporation
www.ddc-web.com
BU-65528 and BU-65527
F1 web-10/02-0
MESSAGE NO. 1
MESSAGE NO. 2
MESSAGE NO. 1
MESSAGE
GAP TIME
FOR MESSAGE NO. 1
BC FRAME TIME
INTERMESSAGE GAP TIME
FIGURE 2. BC MESSAGE GAP AND FRAME TIMING
15
13
0
CURRENT
AREA B/A
CONFIGURATION
REGISTER 1
INITIAL STACK
POINTERS (NOTE)
INITIAL MESSAGE
COUNTERS (NOTE)
MESSAGE
COUNTERS
STACK
POINTERS
BLOCK STATUS WORD
TIME TAG WORD
MESSAGE
GAP TIME WORD
MESSAGE
BLOCK ADDR
DESCRIPTOR
STACKS
MESSAGE
BLOCKS
MESSAGE
BLOCK
MESSAGE
BLOCK
NOTE:
INITIAL STACK POINTERS AND INITIAL
MESSAGE COUNTERS USED ONLY IN
BC FRAME AUTO-REPEAT MODE.
FIGURE 3. BC MODE MEMORY MANAGEMENT
message blocks. Bit 13 of Configuration Register #1 selects the
current active area. At any point in time, the BU-65528/27's inter-
nal 1553 memory management logic may access only the vari-
ous data structures within the “active” area. FIGURE 3 delineates
the “active” and “inactive” areas by the nonshaded and shaded
areas, respectively; however, at any point in time, both the
“active” and “nonactive” areas are accessible by the host proces-
sor. In most applications, the host processor will access the “non-
active” area, while the 1553 bus processes the “active” area mes-
sages.
The BC may be programmed to transmit multimessage frames of
up to 512 messages. The number of messages to be processed
is programmable by the Active Area Message Count location in
the shared RAM, initialized by the host processor. In addition, the
host processor must initialize another location, the Active Area
Stack Pointer. The Stack Pointer references the four-word mes-
sage block descriptor in the Stack area of shared RAM for each
message to be processed. The BC Stack size is programmable
with choices of 256, 512, 1024, and 2048 words.
In the BC Frame Auto-Repeat mode, the Initial Stack Pointer and
Initial Message Counter locations must be loaded by the host
prior to the processing of the first frame. The single frame mode
does not use these two locations.
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