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參數(shù)資料
| 型號： | CT1999 |
| 廠商： | Aeroflex Inc. |
| 英文描述： | CT1999 Remote Terminal and/or Bus Controller for MIL-STD-1553B |
| 中文描述： | CT1999遠程終端和/或總線控制器的MIL - STD - 1553B總線 |
| 文件頁數(shù)： | 7/25頁 |
| 文件大小： | 259K |
| 代理商： | CT1999 |
Aeroflex Circuit Technology
SCDCT1999 REV B 8/14/01 Plainview NY (516) 694-6700
7
Pin Description
Signal
Hybrid
Sink or Source
Signal Description
RX DATA 0/1
SINK
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.
RX DATA 0/1
SINK
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.
TX INHIBIT 0/1
SOURCE
Transmitter Enable.
Goes low when the transmitter is transmitting. Should be
used to enable the bus drivers.
TX DATA
SOURCE
Positive Data Out
- When this signal goes high the bus should be driven
positive.
TX DATA
SOURCE
Negative Data Out
- When this signal goes high the bus should be driven
negative.
RTAD 0-4
SINK
RT address lines
- These should be hardwired by the user. RTAD4 is the most
significant bit.
RTADPAR
SINK
RT address parity line
- This must be hardwired by the user to give odd parity.
BCSTEN 0/1
SINK
Recognition of Broadcast command enable
- When low the recognition of
broadcast command is prevented on the specified bus.
6MCK
SINK
6 Megahertz master clock.
IH 08
IH 19
IH 210
IH 311
IH 412
IH 513
IH614
IH715
SINK/SOURCE
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.
DTRQ
SOURCE
Data Transfer Request
- Goes low to request a data transfer between the
ASIC and subsystem. Goes high at the end of the transfer.
DTAK
SINK
Data Transfer Acknowledge
- Goes low to indicate that the subsystem is
ready for the data transfer.
IUSTB
SOURCE
Interface Unit Strobe
- This is a double pulse strobe used to transfer the two
bytes of data
H/L
SOURCE
High/Low
- Indicates which byte of data is on the internal highway. Logic level
"0" for least significant byte.
GBR
SOURCE
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.
NBGT
SOURCE
New Bus Grant
- Pulses low whenever a new command is accepted by the
ASIC.
TX/RX
SOURCE
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.
INCMD
SOURCE
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.
WC 0-4
SOURCE
Word Count
- These five lines specify the requested number of data words to
be received or transmitted. Valid when INCMD is low.
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