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參數(shù)資料
| 型號(hào)： | BU-61845G3-100 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 12/32頁 |
| 文件大?。?/td> | 833K |
| 代理商： | BU-61845G3-100 |
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12
Data Device Corporation
www.ddc-web.com
BU-61559 Series
C-12/02-300
Words are used to specify the RT memory management scheme
for each Tx/Rx/Bcst-subaddresses. If used, address range 0300-
03FF is dedicated as the illegalizing section of RAM. The actual
Stack RAM area as well as the individual data blocks may be
located in any of the non-fixed areas in the shared RAM address
space.
TABLE 3A illustrates the RT memory map for the case where the
internal illegalizing feature is used. By connecting the ILLENA
input to logic 1 (+5V), address locations 0300-03FF (hex) are
dedicated for the command illegalizing function. TABLE 3B illus-
trates the typical memory map for the case when the internal ille-
galization feature is
not
used. In this instance, ILLENA must be
strapped to logic 0 (ground) so that address locations 0300-03FF
(hex) may be used for storage of stack data or message data
blocks.
ACTIVE AREA DOUBLE BUFFERING
The BU-61559 provides a global double buffering mechanism by
means of bit 13, CURRENT AREA B/A, of Configuration
Register #1. At any point in time, this allows for one stack point-
er, stack area, Lookup Table, and set of data blocks to be desig-
nated as “active” (used for the processing of 1553 messages)
and the alternate set of respective data structures to be desig-
nated as “non-active”.
Both
the “active” and “non-active” RAM
areas are
always accessible
by the host processor.
RT LOOKUP TABLES
Referring to TABLE 4, the RT Lookup tables are expanded
beyond those of the BUS-61553. In the 61553, the Lookup
Tables are 64 words each, containing the Lookup Table pointers
for the 32 receive subaddresses and the 32 transmit subad-
dresses. For the BU-61559, there are an additional 64 words in
Subaddress
Control Word
Lookup Table
(Optional)
SACW SA0
SACW SA31
0220
023F
01A0
01BF
Broadcast
Lookup Table
(Optional)
Bcst SA0
Bcst SA31
0200
021F
0180
019F
Transmit
Lookup Table
Tx SA0
Tx SA31
01E0
01FF
0160
017F
Receive
(/Broadcast)
Lookup Table
Rx(/Bcst) SA0
Rx(/Bcst) SA31
01C0
01DF
0140
015F
COMMENT
DESCRIPTION
AREA B
AREA A
TABLE 4. RT LOOK-UP TABLES
each of the two Lookup Tables. Thirty two (32) of these words
provide optional separation of broadcast messages. The last 32
words are subaddress control words, one appropriated for each
RT subaddress.
SUBADDRESS CONTROL WORD
Referring to FIGURE 13.1 and TABLE 5, in the Enhanced RT
Memory Management mode, each of the 32 Subaddress Control
Words specifies the memory management and interrupt
schemes for the respective subaddress. For each Subaddress
Control Word, five bits control the memory management scheme
and interrupts for each of transmit, receive, and broadcast mes-
sages.
For each transmit, receive, or broadcast subaddress, three bits
are used to specify the memory management scheme. For each
Tx/Rx/Bcst subaddress, the memory management scheme may
be selected for either the “single message” mode or the “circular
buffer” mode.
In the single message mode, a single data block is repeatedly
overread (for transmit data) or overwritten (for receive or broad-
cast data). Alternatively, in the circular buffer mode, Data Words
for successive messages to/from any particular Tx/Rx/Bcst sub-
addresses are read from or written to the
next
contiguous block
of locations in the respective circular buffer.
The size of the circular buffer for each transmit, receive, or
broadcast subaddress may be programmed for 128, 256, 512,
1024, 2048, 4096, or 8192 words. For each Tx/Rx/Bcst subad-
dress, two bits of the subaddress control word are used to
enable interrupts. One of these bits will result in an interrupt fol-
lowing
every
message directed to the specific Tx/Rx/Bcst sub-
FIGURE 13.1 SUBADDRESS CONTROL WORD BIT
MAP
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| BU-61845G4-100 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| BU-61845G4-110 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
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