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CT1990 데이터시트 PDF




Aeroflex Circuit Technology에서 제조한 전자 부품 CT1990은 전자 산업 및 응용 분야에서
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부품번호 CT1990 기능
기능 MIL-STD-1553B Remote Terminal / BUS Controller or Passive Monitor Hybrid
제조업체 Aeroflex Circuit Technology
로고 Aeroflex Circuit Technology 로고


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CT1990 데이터시트, 핀배열, 회로
CT1990/1 Series
MIL-STD-1553B Remote Terminal, BUS Controller,
or Passive Monitor Hybrid with Status Word Control
www.aeroflex.com/Avionics
June 13, 2005
FEATURES
Performs the Complete Dual-Redundant Remote Terminal, Bus Controller Protocol and Passive Monitor Functions of MIL-STD-1553B
Automated Self-Test Functions
Allows Setting of the Message Error Bit on Illegal Commands
Provides Programmable Control over Terminal Flag and Subsystem Flag Status Bits
50mW Typical Power Consumption
+5V DC Operation
Full Military (-55°C to +125°C) Temperature Range
Advanced Low Power VLSI Technology
Compatible with all Aeroflex-Plainview Driver/Receiver Units
Designed for Commercial, Industrial and Aerospace Applications
MIL-PRF-38534 compliant devices available
Aeroflex-Plainview is a Class H & K MIL-PRF-38534 Manufacturer
Packaging – Hermetic Ceramic Plug-In - 90 Pin, 2.4"L x 1.6"W x .225"Ht
DESC SMD# 5962–94775: Released CT1990, Pending CT1991
Encoder
Interface
Unit
Sub Address
&
Word Count
Outputs
BUS "0"
BUS "1"
ASIC
T/R
Hybrid
ASIC
T/R
Hybrid
Driver
Select
&
Enable
Decoder
"O"
Decoder
"1"
Status
Word
Control
Internal
Highway
Control
Program
Inputs
Discrete
Outputs
Control
Inputs
Terminal
Address
Inputs
CT1990/1
Figure 1 – BLOCK DIAGRAM (WITH TRANSFORMERS)
DESCRIPTION
The Aeroflex-Plainview CT1990/1 Series is a monolithic implementation of the MIL-STD-1553B Bus Controller,
Remote Terminal and Passive Monitor functions. All protocol functions of MIL-STD-1553B are incorporated and
a number of options are included to improve flexibility. These features include programming of the status word,
illegalizing specific commands and an independent loop back self-test which is initiated by the subsystem. This
unit is directly compatible with all microprocessor interfaces such as the CT1611 and CT1800 produced by
Aeroflex.
SCDCT1990 Rev C




CT1990 pdf, 반도체, 판매, 대치품
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 70µs 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 13.5µs 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 CT1990/1 allows full use to be made of all the Status Bits, and also implements all the Mode Commands.
External programming of the Terminal Flag and Subsystem Flag Bits plus setting of the Message Error Bit on
reception of an illegal command when externally decoded is available. 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 Acceptance. The Status Bits to which the subsystem has
access, or control 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.
SCDCT1990 Rev C
4

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CT1990 전자부품, 판매, 대치품
Terminal Flag Bit
This bit is reset to logic zero by a power up initialization or the servicing of a legal mode command to reset
the remote terminal (code 01000). This bit can be set to logic one in the current status register in four
possible ways:
1) If the RX detects any message encoding error in the terminals transmission. A loop test failure,
LTFAIL, will be signalled which shall cause the Terminal Flag to be set and the transmission aborted.
2) If a transmitter timeout occurs while the terminal is transmitting.
3) If a remote terminal self test fails.
4) If there is a parity error in the hard wired address to the RX chip.
This bit, once set, shall be repeatedly set until the detected error condition is known to be no longer present.
The transmission of this bit as a logic one can be inhibited by a legal mode command to inhibit terminal flag
bit (code 00110). Similarly, this inhibit can be removed by a mode command to override inhibit terminal
flag bit (code 00111), a power up initialization or a legal mode command to reset remote terminal (code
01000).
If ENABLE is held low, then the three options described below are available and are essentially independent. Any,
all, or none may be selected. Also, reporting of faults by the subsystem requires that SSERR be latched (not
pulsed) low until the fault is cleared.
Resetting SSF and TF on Receipt of Valid Commands
If ENABLE is selected and the other three option lines are held high, then the Status Word Register will be reset
on receipt of any valid command with the exception of Transmit Status and Transmit Last Command. Note that in
this mode, the TF will never be seen in the Status Word, and the SSF will only be seen if SSERR is latched low.
Also note that the SSF will not be seen in response to Transmit Status or Transmit Last Command if the preceding
Status Word was clear, regardless of actions taken on the SSERR line after the clear status transmission.
Status Register Update at Fault Occurrence
If STATUS UPDATE is selected (held low), then the TF or SSF will appear in response to a Transmit Status or
Transmit Last Command issued as the first command after the fault occurs. Any other command (except as noted
in the Preserving the BIT Word section) will reset the TF and SSF. Repeated Transmit Status or Transmit Last
Command immediately following the fault will continue to show the TF and/or SSF in the Status Word. Note that
this behavior may not meet the "letter-of-the-spec" as described in MIL-STD-1553B, but is considered the
"preferred" behavior by some users.
TF and SSF Reporting in the Next Status Word
After the Fault
If NEXT STATUS is selected (held low), then the TF or SSF will appear in response to the very next valid
command after the fault except for Transmit Status or Transmit Last Command. The flag(s) will be reset on receipt
of any valid command following the status transmission with the flag(s) set except for Transmit Status, Transmit
Last Command, or as noted in the following section on Preserving the BIT Word.
Preserving the BIT Word
In order to preserve the Transmitter Timeout Flag, Subsystem Handshake Failure, and Loop Test Failure Bits in
the BIT Word, it is necessary to select BIT DECODE (hold it low). This will prevent resetting those bits if the
Transmit Bit Word Mode Command immediately follows the fault or follows a Transmit Last Command or
Transmit Status immediately following the fault. It will also prevent resetting the TF and SSF Bits in the Status
Word. Any other valid commands will cause those BIT Word Bits and the Status Word Bits to be reset.
SCDCT1990 Rev C
7

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관련 데이터시트

부품번호상세설명 및 기능제조사
CT1990

MIL-STD-1553B Remote Terminal / BUS Controller or Passive Monitor Hybrid

Aeroflex Circuit Technology
Aeroflex Circuit Technology
CT19901

MIL-STD-1553B Remote Terminal/ Bus Controller/ or Passive Monitor Hybrid with Status Word Control

Aeroflex Circuit Technology
Aeroflex Circuit Technology

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