CT1995 Datasheet, PDF (7/25 Pages) Aeroflex Circuit Technology – MIL-STD-1553B Remote Terminal, Bus Controller, or Passive Monitor Hybrid with Status Word Control

Signal
RX DATA 0/1
RX DATA 0/1
TX INHIBIT 0/1
TX DATA
TX DATA
RTAD 0-4
RTADPAR
BCSTEN 0/1
6MCK
IH 08
IH 19
IH 210
IH 311
IH 412
IH 513
IH614
IH715
DTRQ
DTAK
IUSTB
H/L
GBR
NBGT
TX/RX
INCMD
WC 0-4
Pin Description
Hybrid
Sink or Source
Signal Description
SINK
SINK
SOURCE
SOURCE
SOURCE
SINK
SINK
SINK
SINK
SINK/SOURCE
Positive Date In. This should be a TTL description of the positive, half of the
Manchester code data on the bus. It should be driven to a logic level “1” when
a predetermined positive threshold is exceeded on the bus.
Negative Data In. This should be a TTL description of the negative half of the
Manchester code data on the bus. It should be driven to a logic level “1” when
a predetermined negative threshold is exceeded on the bus.
Transmitter Enable. Goes low when the transmitter is transmitting. Should be
used to enable the bus drivers.
Positive Data Out - When this signal goes high the bus should be driven
positive.
Negative Data Out - When this signal goes high the bus should be driven
negative.
RT address lines - These should be hardwired by the user. RTAD4 is the most
significant bit.
RT address parity line - This must be hardwired by the user to give odd parity.
Recognition of Broadcast command enable - When low the recognition of
broadcast command is prevented on the specified bus.
6 Megahertz master clock.
Internal Highway - Bi-directional 8 bit highway on which 16 bit words are
passed in two bytes. IH 715 is the most significant bit of each byte, the most
significant byte being transferred first. The highway should only be driven by
the subsystem when data is to be transferred to the RT.
SOURCE
SINK
SOURCE
SOURCE
SOURCE
SOURCE
SOURCE
SOURCE
SOURCE
Data Transfer Request - Goes low to request a data transfer between the
ASIC and subsystem. Goes high at the end of the transfer.
Data Transfer Acknowledge - Goes low to indicate that the subsystem is
ready for the data transfer.
Interface Unit Strobe - This is a double pulse strobe used to transfer the two
bytes of data
High/Low - Indicates which byte of data is on the internal highway. Logic level
"0" for least significant byte.
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.
New Bus Grant - Pulses low whenever a new command is accepted by the
ASIC.
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.
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.
Word Count - These five lines specify the requested number of data words to
be received or transmitted. Valid when INCMD is low.
Aeroflex Circuit Technology
7
SCDCT1995 REV A 11/21/01 Plainview NY [phone]