參數(shù)資料
型號(hào)： 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(yè)數(shù)： 22/27頁(yè)
文件大?。?/td> 632K
代理商： CT1995-20
4
SCDCT1999 Rev C
If the RT is receiving data in an RT to RT transfer, the data handshaking signals will operate in an identical fashion
but there will be a delay of approx 70s between NBGT going low and DTRQ first going low. See Figure 10.
Figure 6 shows the operation of the data handshaking signals during transmit command with three data words. As
with the receive command discussed previously, NBGT is pulsed low if the command is valid and for the RT.
TX/RX will be set high indicating a transmit data command. While the RT is transmitting its status word, it
requests the first data word from the subsystem by setting DTRQ low. The subsystem must then reply within
approximately 13.5s by setting DTAK low. By setting DTAK low, the subsystem is indicating that it has the data
word ready to pass to the RT. Once DTAK is set low by the subsystem, DTRQ should be used together with H/L
and TX/RX to enable first the high byte and then the low byte of the data word onto the internal highway
IH08-IH715. The RT will latch the data bytes during IUSTB, and will then return DTRQ high. Data for each byte
must remain stable until IUSTB has returned low. Signal timing for this handshaking is shown in Figure 11.
Additional Data Information Signals
At the same time as data transfers take place, a number of information signals are made available to the
subsystem. These are INCMD, the subaddress lines SA0-SA4, the word count lines WC0-WC4 and current word
count lines CWC0-CWC4. Use of these signals is optional.
INCMD will go active low while the RT is servicing a valid command for the RT. The subaddress,
transmit/receive bit, and word count from the command word are all made available to the subsystem as
SA0-SA4, TX/RX and WC0-WC4 respectively. They may be sampled when INCMD goes low and will remain
valid while INCMD is low.
The subaddress is intended to be used by the subsystem as an address pointer for the data block. Subaddress 0 and
31 are mode commands, and there can be no receive or transmit data blocks associated with these. (Any data word
associated with a mode command uses different handshaking operations. If the subsystem does not use all the
subaddresses available, then some of the subaddress lines may be ignored.
The TX/RX signal indicates the direction of data transfer across the RT - subsystem interface. Its use is described
in the previous section.
The word count tells the subsystem the number of words to expect to receive or transmit in a message, up to 32
words. A word count of all 0s indicates a count of 32 words.
The current word count is set to 0 at the beginning of a new message and is incremented following each data word
transfer across the RT - subsystem interface. (It is clocked on the falling edge of the second IUSTB pulse in each
word transfer). It should be noted that there is no need for the subsystem to compare the word count and current
word count to validate the number of words in a message. This is done by the RT.
Subsystem Use Of Status Bits And Mode Commands
General Description
Use of the status bits and the mode commands is one of the most confusing aspects of MIL-STD-1553B. This is
because much of their use is optional, and also because some involve only the RT while others involve both the RT
and the subsystem.
The CT1999 allows full use to be made of all the Status Bits, and also implements all the Mode Commands. The
subsystem is given the opportunity to make use of Status Bits, and is only involved in Mode Commands which
have a direct impact on the subsystem.
The mode commands in which the subsystem may be involved are Synchronize, Sychronize with data word,
Transmit Vector Word, Reset and Dynamic Bus Control allocation. The Status Bits to which the subsystem has
access are Service Request, Busy, Dynamic Bus Control Acceptance, Terminal Flag, Subsystem Flag, and
Message Error Bit. Operation of each of these Mode Commands and of the Status Bits is described in the
following sections.
All other Mode Commands are serviced internally by the RT. The Terminal Flag and Message Error Status Bits
相關(guān)PDF資料
PDF描述
CT2-GI1LATD53C5 FIBER OPTIC TRANSCEIVER, 1260-1360nm, 2700Mbps(Tx), 2700Mbps(Rx), PANEL MOUNT, LC CONNECTOR
CT2-GI1LATD31C5 FIBER OPTIC TRANSCEIVER, 1260-1360nm, 2700Mbps(Tx), 2700Mbps(Rx), PANEL MOUNT, LC CONNECTOR
CT2-GI1LATD33C4 FIBER OPTIC TRANSCEIVER, 1260-1360nm, 2700Mbps(Tx), 2700Mbps(Rx), PANEL MOUNT, LC CONNECTOR
CT2-GI1LATD51C4 FIBER OPTIC TRANSCEIVER, 1260-1360nm, 2700Mbps(Tx), 2700Mbps(Rx), PANEL MOUNT, LC CONNECTOR
CT2-GI1LATD51C5 FIBER OPTIC TRANSCEIVER, 1260-1360nm, 2700Mbps(Tx), 2700Mbps(Rx), PANEL MOUNT, LC CONNECTOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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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