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PDF CT1991 Data sheet ( Hoja de datos )

Número de pieza CT1991
Descripción MIL-STD-1553B Remote Terminal / BUS Controller or Passive Monitor Hybrid
Fabricantes Aeroflex Circuit Technology 
Logotipo Aeroflex Circuit Technology Logotipo



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No Preview Available ! CT1991 Hoja de datos, Descripción, Manual

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

1 page




CT1991 pdf
All other Mode Commands are serviced internally by the RT. The Terminal Flag and Message Error Status Bits
and BIT Word contents are controlled by the RT; however the subsystem has the option to set the Message Error
Bit and to control the reset conditions for the Terminal Flag and Subsystem Flag Bits in the Status Word, and the
Transmitter Timeout, Subsystem Handshake, and Loop Test Fail Bits in the BIT Word.
Synchronize Mode Commands
Once the RT has validated the command word and checked for the correct address, the SYNC line is set low. The
signal WC4 will be set low for a Synchronize mode command (See Figure 16), and high for a Synchronize with
data word mode command (See Figure 15). In a Synchronize with data word mode command, SYNC remains low
during the time that the data word is received. Once the data word has been validated, it is 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). SYNC being low should be used on the enable to allow IUSTB to clock
synchronize mode data to the subsystem.
If the subsystem does not need to implement either of these mode commands, the SYNC signal can be ignored,
since the RT requires no response from the subsystem.
Transmit Vector Word Mode Command
Figure 14 illustrates the relevant signal timings for an RT receiving a valid Transmit Vector Word mode command.
The RT requests data by setting VECTEN low. The subsystem should use H/L to enable first the high byte and
then the low byte of the Vector word onto the internal highway IH08-IH715.
It should be noted that the RT expects the Vector word contents to be already prepared in a latch ready for enabling
onto the internal highway when VECTEN goes low. If the subsystem has not been designed to handle the Vector
word mode command, it will be the fault of the Bus Controller if the RT receives such a command. Since the
subsystem is not required to acknowledge the mode command, the RT will not be affected in any way by Vector
word circuitry not being implemented in the subsystem. It will however transmit a data word as the Vector word,
but this word will have no meaning.
Reset Mode Command
Figure 8 shows the relevant signal timings for an RT receiving a valid reset mode command. Once the command
word has been fully validated and serviced, the RESET signal is pulsed low. This signal may be used as a reset
function for subsystem interface circuitry.
Dynamic Bus Allocation
This mode command is intended for use with a terminal which has the capability of configuring itself into a bus
controller on command from the bus. The line DBCREQ cannot go true unless the DBCACC line was true at the
time of the valid command, i.e. tied low. For terminals acting only as RTs, the signal DBCACC should be tied
high (inactive), and the signal DBCREQ should be ignored and left unconnected.
Use of the Busy Status Bit
The Busy Bit is used by the subsystem to indicate that it is not ready to handle data transfers either to or from the
RT.
The RT sets the bit to logic one if the BUSY line from the subsystem is active low at the time of the second falling
edge of INCLK after INCMD goes low. This is shown in Figure 13. Once the Busy bit is set, the RT will stop all
receive and transmit data word transfers to and from the subsystem. The data transfers in the Synchronize with
data word and Transmit Vector word mode commands are not affected by the Busy bit and will take place even if
it has been set.
It should be noted that a minimum of 0.5µs subaddress decoding time is given to the subsystem before setting of
status bits. This allows the subsystem to selectively set the Busy bit if for instance one subaddress is busy but
others are ready. This option will prove useful when an RT is interfacing with multiple subsystems.
SCDCT1990 Rev C
5

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CT1991 arduino
Signal
DTAK
IUSTB
H/L
GBR
NBGT
MEREQ
TX/RX
INCMD
WC0-WC4
SA0-SA4
CWC0-CWC4
SYNC
VECTEN/DWEN
RESET
SSERR
BUSY
SERVREQ
SCDCT1990 Rev C
PIN DESCRIPTION (con’t)
Direction
Signal Description
INPUT
Data Transfer Acknowledge - Goes low to indicate that the
subsystem is ready for the data transfer.
OUTPUT
Interface Unit Strobe - This is a double pulse strobe used to transfer
the two bytes of data
OUTPUT
High/Low - Indicates which byte of data is on the internal highway.
Logic level "0" for least significant byte.
OUTPUT
Good Block Received - Pulses low for 500ns when a block of data
has been received by the ASIC and has passed all the validity and
error checks.
OUTPUT
New Bus Grant - Pulses low whenever a new command is accepted
by the ASIC.
INPUT
Message Error Request - Positive-going edge will cause Message
Error Bit in Status Word to be set.
OUTPUT
Transmit/Receive - The state of this line informs the subsystem
whether it is to transmit or receive data The signal is valid while
INCMD is low.
OUTPUT
In Command - Goes low when the RT is servicing a valid command.
The subaddress and word count lines are valid while the signal is
low.
OUTPUT
Word Count - These five lines specify the requested number of data
words to be received or transmitted. Valid when INCMD is low.
OUTPUT
Sub Address - These five lines are a label for the data being
transferred. Valid when INCMD is low.
OUTPUT
Current Word Count - These five lines define which data word in
the message is currently being transferred.
OUTPUT
Synchronize - Goes low when a synchronize mode code is being
serviced.
OUTPUT
Vector Word Enable/DataWord Enable - In the RT mode, this
signal is provided to enable the contents of the vector word latch
(which is situated in the subsystem) onto the ASIC’s internal
highway. This signal, when in the Bus Controller mode, is used to
enable mode code data from the subsystem onto the internal
highway.
OUTPUT
Reset - This line pulses low for 500ns on completion of the servicing
of a valid and legal mode command to reset remote terminal.
INPUT
Subsystem Error - By taking this line low, the subsystem can set the
Subsystem Flag in the Status Word.
INPUT
Busy - This signal should be driven low if the subsystem is not ready
to perform a data transfer to or from the ASIC.
INPUT
Service Request - This signal should be driven low to request an
asynchronous transfer and left low until the transfer has taken place.
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