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参数资料
| 型号： | BU-65170V6-520S |
| 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, CDFP70 |
| 封装： | 48.30 X 25.40 MM, 3.81 MM HEIGHT, FP-70 |
| 文件页数： | 6/44页 |
| 文件大小： | 563K |
| 代理商： | BU-65170V6-520S |
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14
Data Device Corporation
www.ddc-web.com
BU-65170/61580/61585
H1 web-09/02-0
include a set of interrupt conditions, internal command illegaliza-
tion, and programmable busy by subaddress.
RT MEMORY ORGANIZATION
TABLE 26 illustrates a typical memory map for the BU-61580 in
RT mode. 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. Besides the Stack Pointer, for RT mode there are
several other areas of the ACE address space designated as
fixed locations. All RT modes of operation require the Area A and
Area B Lookup Tables. Also allocated are several fixed locations
for optional features: Command Illegalization Lookup Table,
Mode Code Selective Interrupt Table, Mode Code Data Table,
and Busy Bit Lookup Table. It should be noted that any unen-
abled optional fixed locations may be used for general purpose
storage (data blocks).
The RT Lookup tables, which provide a mechanism for mapping
data blocks for individual Tx/Rx/Bcst-subaddresses to areas in
the RAM, occupy address range locations are 0140 to 01BF for
Area A and 01C0 to 023F for Area B. The RT lookup tables
include Subaddress Control Words and the individual Data Block
Pointers. If used, address range 0300-03FF will be dedicated as
the illegalizing section of RAM. The actual Stack RAM area and
the individual data blocks may be located in any of the nonfixed
areas in the shared RAM address space.
RT MEMORY MANAGEMENT
One of the salient features of the ACE series products is the flex-
ibility of its RT memory management architecture. The RT archi-
tecture allows the memory management scheme for each trans-
mit, receive, or broadcast subaddress to be programmable on a
subaddress basis. Also, in compliance with MIL-STD-1553B
Notice 2, the BU-65170/61580 provides an option to separate
data received from broadcast messages from nonbroadcast
received data.
Besides supporting a global double buffering scheme (as in BC
mode), the ACE RT provides a pair of 128-word Lookup Tables
for memory management control. They are programmable on a
subaddress basis (refer to TABLE 27). These 128-word tables
include 32-word tables for transmit message pointers and
receive message pointers. There is also a third, optional Lookup
Table for broadcast message pointers, providing Notice 2 com-
pliance, if necessary.
The fourth section of each of the RT Lookup Tables stores the 32
Subaddress Control Words (refer to TABLE 9 and 28). The indi-
vidual Subaddress Control Words may be used to select the RT
memory management option and interrupt scheme for each
transmit, receive, and (optionally) broadcast subaddress.
For each transmit subaddress, there are two possible memory
management schemes: (1) single message; and (2) circular
buffer. For each receive (and optionally broadcast) subaddress,
there are three possible memory management schemes: (1) sin-
gle message; (2) double buffered; and (3) circular buffer. For
each transmit, receive and broadcast subaddress, there are two
interrupt conditions that are programmable by the respective
Subaddress Control Word: (1) after every message to the sub-
Data Block 100
0FE0-0FFF
Data Block 6
0420-043F
Data Block 5
0400-041F
Command Illegalizing Table (fixed area)
0300-03FF
RESERVED
Data Block 1-4
0280-02FF
Data Block 0
0260-027F
(not used)
0248-025F
Busy Bit Lookup Table (fixed area)
0240-0247
Lookup Table B (fixed area)
01C0-023F
Lookup Table A (fixed area)
0140-01BF
Mode Code Data (fixed area)
0110-013F
Mode Code Selective Interrupt Table (fixed area)
0108-010F
Stack Pointer B (fixed location)
0104
RESERVED
0101-0103
Stack Pointer A (fixed location)
0100
Stack A
0000-00FF
DESCRIPTION
ADDRESS
(HEX)
0105-0107
TABLE 26. TYPICAL RT MEMORY MAP (SHOWN FOR 4K RAM)
TABLE 27. LOOK-UP TABLES
AREA A
AREA B
DESCRIPTION
COMMENT
01C0
.
01DF
Rx(/Bcst)_SA0
.
Rx(/Bcst)_SA31
Receive
(/Broadcast)
Lookup Table
01E0
.
01FF
Tx_SA0
.
Tx_SA31
Transmit
Lookup Table
0200
.
021F
Bcst_SA0
.
Bcst_SA31
Broadcast
Lookup Table
Optional
0220
.
023F
SACW_SA0
.
SACW_SA31
Subaddress
Control Word
Lookup Table
(Optional)
0140
.
015F
0160
.
017F
0180
.
019F
01A0
.
01BF
MM2
MM1
MM0
COMMENT
0
Single Message or Double Buffered
0
1
128-Word
0
1
0
256-Word
0
1
512-Word
1
0
1
0
1
0
8192-Word
4096-Word
2048-Word
1024-Word
Circular Buffer of
Specified Size
DESCRIPTION
TABLE 28. SUBADDRESS CONTROL WORD
Memory Management Subaddress Buffer Scheme
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