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參數(shù)資料
| 型號(hào)： | BU-61559D2-670S |
| 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, CQIP78 |
| 封裝： | 45.70 X 53.30 MM, 5.30 MM HEIGHT, CERAMIC, DDIP-78 |
| 文件頁數(shù)： | 3/32頁 |
| 文件大?。?/td> | 438K |
| 代理商： | BU-61559D2-670S |
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11
Data Device Corporation
www.ddc-web.com
BU-61559 Series
E-03/06-0
RT OPERATION
Some of the principal features of the BU-61559 for Remote
Terminal (RT) mode include implementation of all MIL-STD-
1553B formats and dual redundant mode codes, internal com-
mand illegalizing, implementation of the “Busy” function, an inter-
nally formulated BIT Word, and comprehensive error checking,
including RT-to-RT transfer errors.
Remote Terminal address for the BU-61559 is pin programma-
ble. Six input pins, RTAD4 through RTAD0 plus RTADP, need to
be correctly strapped for RT address and odd address parity to
enable the BU-61559 to recognize and respond to its own dis-
crete RT address. In addition, the upper two bits of Configuration
Register #1 must be programmed for 1 and 0 respectively to con-
figure the BU-61559 for RT mode. “Active Area” and the RT
Status Word bits Subsystem Flag, Service Request, Busy, and
Dynamic Bus Control Accept are also software programmable by
means of Configuration Register #1.
The BU-61559's advanced RT features are selectable by means
of Configuration Register #2. The two most important of these
features are the ENHANCED RT MODE (bit 1) and the option for
SEPARATION OF BROADCAST MESSAGES (bit 0). If the
enhanced mode is not chosen, the BU-61559's memory man-
agement scheme defaults to that of the BUS-61553 AIM-HY. In
this configuration, each T/R-subaddress is mapped to a single
data block by means of its respective Lookup Table entry. In this
mode, the data block for each T/R-subaddress is repeatedly
overwritten or overread. If the enhanced mode is selected, the
user has the option of selecting either the “single message”
mode or making use of the circular buffer option, on a
transmit/receive/broadcast-subaddress basis. The circular buffer
option supports bulk data transfers by automatically access-
ing/storing multiple receive or transmit messages per T/R-sub-
address, up to a maximum of 8192 words.
The BU-61559 includes an option for internal command illegaliz-
ing. If this option is utilized, 256 words of the BU-61559's 8K X
16 of internal dual port RAM may be dedicated for the command
illegalization function. The BU-61559 allows any subset of the
4096 possible 1553 Command Words to be illegalized as a func-
tion of broadcast/own address, T/R bit, subaddress, and word
count/mode code.
Other RT options controlled by Configuration Register #2 include
automatic clearing of the Service Request Status Word bit fol-
lowing a Transmit Vector Word mode command and capabilities
to clear and/or load the Time Tag Register following receipt of
Synchronize mode commands.
RT MEMORY ORGANIZATION
A typical memory map for the BU-61559 in RT mode is illustrat-
ed in TABLE 3. As in BC mode, the two Stack Pointers reside in
fixed locations in the shared RAM address space: address 0100
(hex) for the Area A Stack Pointer and address 0104 for the Area
B Stack Pointer. In addition to the Stack Pointer, for RT mode
there are three other areas of the AIM-HY'er address space that
are designated as fixed locations. These are for the Area A and
Area B Lookup Tables and for the optional section of the shared
internal dual port RAM that may be selected for the use of com-
mand illegalizing. The RT Lookup tables, which provide a mech-
anism for mapping data blocks for individual Tx/Rx/Bcst-subad-
dresses to areas in the RAM, are located in address range 0140
to 01BF for Area A and address range 01C0 to 023F for Area B.
The RT lookup tables include Subaddress Control Words as well
as the individual Data Block Pointers. The Subaddress Control
ADDRESS (HEX)
0000-00FF
Stack A
0100
Stack Pointer A (fixed location)
0104
Stack Pointer B (fixed location)
0140-01BF
Lookup Table A (fixed area)
01C0-023F
Lookup Table B (fixed area)
0240-025F
Data Block 0
0260-027F
Data Block 1
1EE0-1EFF
Data Block 221
1F00-1FFF
Stack B
02E0-02FF
Data Block 6
0300-03FF
Command Illegalizing
0400-041F
Data Block 7
0420-043F
Data Block 8
0000-00FF
Stack A
0100
Stack Pointer A (fixed location)
0104
Stack Pointer B (fixed location)
0140-01BF
Lookup Table A (fixed area)
01C0-023F
Lookup Table B (fixed area)
0240-025F
Data Block 0
0260-027F
Data Block 1
0280-029F
Data Block 2
02A0-02BF
Data Block 3
1EE0-1EFF
Data Block 229
1F00-1FFF
Stack B
TABLE 3A. TYPICAL RT MEMORY MAP (WITH THE
COMMAND ILLEGALIZING OPTION SELECTED)
DESCRIPTION
ADDRESS (HEX)
TABLE 3B. TYPICAL RT MEMORY MAP (WITH THE
COMMAND ILLEGALIZING OPTION NOT SELECTED)
DESCRIPTION
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