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參數資料
| 型號： | BU-61582F2-481 |
| 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, CDFP70 |
| 封裝： | CERAMIC, DFP-70 |
| 文件頁數： | 13/48頁 |
| 文件大?。?/td> | 378K |
| 代理商： | BU-61582F2-481 |
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20
Data Device Corporation
www.ddc-web.com
BU-61582
G-08/02-250
SP’ACE stores the full 16-bit 1553 Command Word in the fourth
location of the RT message descriptor.
RT COMMAND ILLEGALIZATION
The BU-61582 provides an internal mechanism for RT com-
mand illegalization. In addition, there is a means for allowing the
setting of the Busy Status Word bit to be only for a programmed
subset of the transmit/receive/broadcast subaddresses.
The illegalization scheme uses a 256-word area in the BU-
61582’s address space. A benefit of this feature is the reduction
of printed circuit board requirements, by eliminating the need for
an external PROM, PLD, or RAM device that does the illegaliz-
ing function. The BU-61582’s illegalization scheme provides
maximum flexibility, allowing any subset of the 4096 possible
combinations of broadcast/own address, T/R bit, subaddress,
and word count/mode code to be illegalized. Another advantage
of the RAM-based illegalization technique is that it provides for
a high degree of self-testability.
ADDRESSING THE ILLEGALIZATION TABLE.
TABLE 31 illustrates the addressing scheme of the illegalization
RAM. As shown, the base address of the illegalizing RAM is
0300 (hex). The SP’ACE formulates the index into the Illegalizing
Table based on the values of BROADCAST/OWNADDRESS
ADDRESS, T/R bit, Subaddress, and the MSB of the Word
Count/Mode Code field (WC/MC4) of the current Command
Word.
The internal RAM has 256 words reserved for command illegal-
ization. Broadcast commands may be illegalized separately from
nonbroadcast receive commands and mode commands.
Commands may be illegalized down to the word count level. For
example, a one-word receive command to subaddress 1 may be
legal, while a two-word receive command to subaddress 1 may
be illegalized.
The first 64 words of the Illegalization Table refer to broadcast
receive commands (two words per subaddress). The next 64
words refer to broadcast transmit commands. Since nonmode
code broadcast transmit commands are by definition invalid, this
section of the table (except for subaddresses 0 and 31) does not
need to be initialized by the user. The next 64 words correspond
to nonbroadcast receive commands. The final 64 words refer to
nonbroadcast transmit commands. Messages with Word Count/
Mode Code (WC/MC) fields between 0 and 15 may be illegal-
ized by setting the corresponding data bits for the respective
even-numbered address locations in the illegalization table.
Likewise, messages with WC/MC fields between 16 and 31 may
be illegalized by setting the corresponding data bits for the
respective odd-numbered address locations in the illegalization
table.
The following should be noted with regards to command
illegalization:
(1) To illegalize a particular word count for a given broadcast/own
address-T/R subaddress, the appropriate bit position in the
respective illegalization word should be set to logic 1. A bit value
of logic 0 designates the respective Command Word as a legal
command. The BU-61582 will respond to an illegalized non-
broadcast command with the Message Error bit set in its RT
Status Word.
(2) For subaddresses 00001 through 11110, the “WC/MC” field
specifies the Word Count field of the respective Command Word.
For subaddresses 00000 and 11111, the “WC/MC” field speci-
fies the Mode Code field of the respective Command Word.
(3) Since nonmode code broadcast transmit messages are not
defined by MIL-STD-1553B, the sixty (60) words in the illegal-
ization RAM, addresses 0342 through 037D, corresponding to
these commands do not need to be initialized. The BU-61582 will
not respond to a nonmode code broadcast transmit command,
but will automatically set the Message Error bit in its internal
Status Register, regardless of whether or not the corresponding
bit in the illegalization RAM has been set. If the next message is
a Transmit Status or Transmit Last Command mode code, the
BU-61582 will respond with its Message Error bit set.
WC4/MC4
0(LSB)
SA0
1
SA1
2
0
SA2
3
SA3
4
SA4
5
T/R
6
BROADCAST/OWN_ADDRESS
7
1
8
1
9
0
10
0
12
0
13
0
14
0
15(MSB)
DESCRIPTION
BIT
11
TABLE 31. ILLEGALIZATION RAM ADDRESS
DEFINITION
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