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參數(shù)資料
| 型號： | CT1995-20 |
| 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, CQIP90 |
| 封裝： | 1.600 X 2.400 INCH, CERAMIC, PLUG IN-90 |
| 文件頁數(shù)： | 21/27頁 |
| 文件大?。?/td> | 632K |
| 代理商： | CT1995-20 |
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3
SCDCT1999 Rev C
REMOTE TERMINAL OPERATION
Receive Data Operation
All valid data words associated with a valid receive data command word for the RT are passed to the subsystem.
The RT examines all command words from the bus and will respond to valid (i.e. correct Manchester, parity
coding etc.) commands which have the correct RT address (or broadcast address if the RT broadcast option is
enabled). When the data words are received, they are decoded and checked by the RT and, if valid, passed to the
subsystem on a word by word basis at 20s intervals. This applies to receive data words in both Bus Controller to
RT and RT to RT messages. When the RT detects that the message has finished, it checks that the correct number
of words have been received and if the message is fully valid, then a Good Block Received signal is sent to the
subsystem, which must be used by the subsystem as permission to use the data just received.
The subsystem must therefore have a temporary buffer store up to 32 words long into which these data words can
be placed. The Good Block Received signal will allow use of the buffer store data once the message has been
validated.
If a block of data is not validated, then Good Block Received will not be generated. This may be caused by any
sort of message error or by a new valid command for the RT being received on another bus to which the RT must
switch.
Transmit Data Operation
If the RT receives a valid transmit data command addressed to the RT, then the RT will request the data words
from the subsystem for transmission on a word by word basis. To allow maximum time for the subsystem to
collect each data word, the next word is requested by the RT as soon as the transmission of the current word has
commenced.
It is essential that the subsystem should provide all the data words requested by the RT once a transmit sequence
has been accepted. Failure to do so will be classed by the RT as a subsystem failure and reported as such to the Bus
Controller.
Control of Data Transfers
This section describes the detailed operation of the data transfer mechanism between RT and subsystems. It covers
the operations of the signals DTRQ, DTAK, IUSTB, H/L, GBR, NBGT, TX/RX during receive data and transmit
data transfers.
Figure 7 shows the operation of the data handshaking signals during a receive command with two data words.
When the RT has fully checked the command word, NBGT is pulsed low, which can be used by the subsystem as
an initialization signal. TX/RX will be set low indicating a receive command. When the first data word has been
fully validated, DTRQ is set low. The subsystem must then reply within approximately 1.5s by setting DTAK
low. This indicates to the RT that the subsystem is ready to accept data. The data word is then passed to the
subsystem on the internal highway IH08-IH715 in two bytes using IUSTB as a strobe signal and H/L as the byte
indicator (high byte first followed by low byte). Data is valid about both edges of IUSTB. Signal timing for this
handshaking is shown in Figure 12.
If the subsystem does not declare itself busy, then it must respond to DTRQ going low by setting DTAK low
within approximately 1.5s. Failure to do so will be classed by the RT as a subsystem failure and reported as such
to the Bus Controller.
It should be noted that IUSTB is also used for internal working in the RT. DTRQ being low should be used as an
enable for clocking data to the subsystem with IUSTB.
Once the receive data block has finished and been checked by the RT, GBR is pulsed low if the block is entirely
correct and valid. This is used by the subsystem as permission to make use of the data block if no GBR signal is
generated, then an error has been detected by the RT and the entire data block is invalid and no data words in it
may be used.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| CT1995-20-2 | 制造商:AEROFLEX 制造商全稱:AEROFLEX 功能描述:MIL-STD-1553B Remote Terminal, Bus Controller, or Passive Monitor Hybrid with Status Word Control |
| CT1995-20-3 | 制造商:AEROFLEX 制造商全稱:AEROFLEX 功能描述:MIL-STD-1553B Remote Terminal, Bus Controller, or Passive Monitor Hybrid with Status Word Control |
| CT1999 | 制造商:AEROFLEX 制造商全稱:AEROFLEX 功能描述:CT1999 Remote Terminal and/or Bus Controller for MIL-STD-1553B |
| CT1999-FP | 制造商:AEROFLEX 制造商全稱:AEROFLEX 功能描述:CT1999 Remote Terminal and/or Bus Controller for MIL-STD-1553B |
| CT1A18-11PSA206 | 制造商:ITT Interconnect Solutions 功能描述:ER 5C 5#12 PIN RECP |
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