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參數(shù)資料

型號(hào)：	BU-61580S0-400W
廠商：	DATA DEVICE CORP
元件分類(lèi)：	微控制器/微處理器
英文描述：	2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQIP70
封裝：	48.30 X 25.40 MM, 4.19 MM HEIGHT, DIP-70
文件頁(yè)數(shù)：	9/44頁(yè)
文件大?。?/td>	563K
代理商：	BU-61580S0-400W

Data Device Corporation

www.ddc-web.com

BU-65170/61580/61585

H1 web-09/02-0

(1) Disable the double buffering for the respective subad-

dress by the Subaddress Control Word. That is, temporarily

switch the subaddress' memory management scheme to the

Single Message mode.

(2) Read the current value of the receive (or broadcast) sub-

address's Lookup Table pointer. This points to the current

“active” Data Word block. By inverting bit 5 of this pointer

value, it is possible to locate the start of the “inactive” Data

Word block. This block will contain the Data Words received

during the most recent valid message to the subaddress.

(3) Read out the words from the “inactive” (most recent)

Data Word Block.

(4) Re-enable the Double Buffering mode for the respective

subaddress by the Subaddress Control Word.

RT INTERRUPTS

As in BC mode, the BU-65170/61580 RT provides many mask-

able interrupts. RT interrupt conditions include End of (every)

Message, Message Error, Selected Subaddress (Subaddress

Control Word) Interrupt, Circular Buffer Rollover, Selected Mode

Code Interrupt, and Stack Rollover.

DESCRIPTOR STACK

At the beginning and end of each message, the BU-

65170/61580 RT stores a four-word message descriptor in the

active area stack. The RT stack size is programmable, with

choices of 256, 512, 1024, and 2048 words. FIGURES 5, 6 and

7 show the four words: Block Status Word, Time Tag Word, Data

Block Pointer, and the 1553 received Command Word. The RT

Block Status Word includes indications of message in-progress

or message complete, bus channel, RT-to-RT transfer and RT-to-

RT transfer errors, message format error, loop test (self-test) fail-

ure, circular buffer rollover, illegal command, and other error con-

ditions. TABLE 22 shows the bit mapping of the RT Block Status

Word.

As in BC mode, the Time Tag Word stores the current contents

of the BU-65170/61580's read/writable Time Tag Register. The

resolution of the Time Tag Register is programmable from among

2, 4, 8, 16, 32, and 64 s/LSB. Also, incrementing of the Time

Tag counter may be from an external clock source or via software

command.

The ACE stores the contents of the accessed Lookup Table loca-

tion for the current message, indicating the starting location of

the Data Word block, as the Data Block Pointer. This serves as a

convenience in locating stored message data blocks. The ACE

stores the full 16-bit 1553 Command Word in the fourth location

of the RT message descriptor.

RT COMMAND ILLEGALIZATION

The BU-65170/61580 provides an internal mechanism for RT

command illegalization. In addition, the Busy Status Word bit

can be set so that it is only a programmed subset of the trans-

mit/receive/broadcast subaddresses.

The illegalization scheme uses a 256-word area in the BU-

65170/61580'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 illegalizing function. The BU-J1165170/61580'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 29 illustrates the addressing scheme of the illegalization

RAM. As shown, the base address of the illegalizing RAM is

0300 (hex). The ACE formulates the index into the Illegalizing

Table based on the values of BROADCAST/OWN 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 illegalized

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 ille-

galized 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 illegal-

ization:

(1)To illegalize a particular word count for a given broad-

cast/own address-T/R subaddress, the appropriate bit posi-

tion 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 ACE will respond

to an illegalized nonbroadcast 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 specifies the Mode Code field of the respec-

tive Command Word.

(3)Since nonmode code broadcast transmit messages are

not defined by MIL-STD-1553B, the sixty (60) words in the

illegalization RAM, addresses 0342 through 037D, corre-

sponding to these commands do not need to be initialized.

The ACE will not respond to a nonmode code broadcast

transmit command, but will automatically set the Message

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
BU-61580S1-100	制造商:未知廠家制造商全稱(chēng):未知廠家功能描述:MIL-STD-1553/ARINC Bus Controller/RTU
BU-61580S1-110	制造商:未知廠家制造商全稱(chēng):未知廠家功能描述:MIL-STD-1553/ARINC Bus Controller/RTU
BU-61580S1-120	制造商:未知廠家制造商全稱(chēng):未知廠家功能描述:MIL-STD-1553/ARINC Bus Controller/RTU
BU-61580S1-200	制造商:未知廠家制造商全稱(chēng):未知廠家功能描述:MIL-STD-1553/ARINC Bus Controller/RTU
BU-61580S1-300	制造商:未知廠家制造商全稱(chēng):未知廠家功能描述:MIL-STD-1553/ARINC Bus Controller/RTU

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