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参数资料
| 型号： | BU-65743F3-200 |
| 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： | 25/75页 |
| 文件大小： | 532K |
| 代理商： | BU-65743F3-200 |
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31
Data Device Corporation
www.ddc-web.com
BU-65743/65843/65863/65864
D-06/04-0
RT MEMORY ORGANIZATION
TABLE 54 illustrates a typical memory map for a PCI Mini-ACE
Mark3/Micro-ACE TE RT with 4K RAM. Note that this table and
subsequent references to it are using word addressing: PCI
BAR0 address offsets (byte addresses) are TWO times the word
addresses indicated. The two Stack Pointers reside in fixed loca-
tions in the shared RAM address space: address 0100h (PCI
BAR0 offset 0200h) for the Area A Stack Pointer and address
0104h (PCI BAR0 offset 208h) for the Area B Stack Pointer. In
addition to the Stack Pointer, there are several other areas of the
shared RAM address space that are designated as fixed loca-
tions (all shown in bold). These are for the Area A and Area B
lookup tables, the illegalization lookup table, the busy lookup
table, and the mode code data tables.
The RT lookup tables provide a mechanism for allocating data
blocks for individual transmit, receive, or broadcast subaddress-
es. The RT lookup tables include subaddress control words as
well as the individual data block pointers. If command illegaliza-
tion is used, address range 0300-03FF is used for command ille-
galizing. The descriptor stack RAM area, as well as the individ-
ual data blocks, may be located in any of the non-fixed areas in
the shared RAM address space.
Note that in TABLE 54, there is no area allocated for "Stack B".
This is shown for purpose of illustration. Also, note that in TABLE
54, the allocated area for the RT command stacks is 256 words.
However, larger stack sizes are possible. That is, the RT com-
mand stack size may be programmed for 256 words (64 mes-
sages), 512, 1024, or 2048 words (512 messages) by means of
bits 14 and 13 of Configuration Register 3.
STACK POINTER B
0104
RESERVED
0102-0103
GLOBAL CIRCULAR BUFFER A POINTER
0101
STACK POINTER A
0100
STACK A
0000-00FF
DESCRIPTION
WORD ADDRESS
(HEX)
TABLE 54. TYPICAL RT MEMORY MAP (SHOWN AS 4K RAM)
PCI BAR0
OFFSET(HEX
)
0000-01FE
0200
0202
0204-0206
0208
LOOKUP TABLE A
0140-01BF
MODE CODE DATA
0110-013F
MODE CODE SELECTIVE INTERRUPT TABLE
0108-010F
RESERVED
0106-0107
GLOBAL CIRCULAR BUFFER A POINTER
0105
020A
020C-020E
0210-021E
0220-027E
0280-037E
DATA BLOCK 1-4
0280-02FF
DATA BLOCK 0
0260-027F
(NOT USED)
0248-025F
BUSY BIT LOOKUP TABLE
0240-0247
LOOKUP TABLE B
01C0-023F
0380-047E
0480-048E
0490-04BE
04C0-04FE
0500-05FE
COMMAND ILLEGALIZING TABLE
0300-03FF
0600-07FE
DATA BLOCK 5
0400-041F
0800-083E
DATA BLOCK 6
0420-043F
0840-087E
DATA BLOCK 100
0FE0-0FFF
1FC0-1FFE
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