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HI-3584ACJMF-15 Datasheet(PDF) 7 Page - Holt Integrated Circuits

Part # HI-3584ACJMF-15
Description  ARINC 429 3.3V Serial Transmitter
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Manufacturer  HOLTIC [Holt Integrated Circuits]
Direct Link  http://www.holtic.com
Logo HOLTIC - Holt Integrated Circuits

HI-3584ACJMF-15 Datasheet(HTML) 7 Page - Holt Integrated Circuits

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DATA TRANSMISSION
REPEATER OPERATION
HI-3584A-15
MASTER RESET (
)
When ENTX goes high, enabling transmission, the FIFO
positions are incremented with the top register loading into the
data transmission shift register. Within 2.5 data clocks the first
data bit appears at 429DO and
. The 31 or 32 bits in the
data transmission shift register are presented sequentially to the
outputs in the ARINC 429 format with the following timing:
ARINC DATA BIT TIME
10 Clocks
80 Clocks
DATA BIT TIME
5 Clocks
40 Clocks
NULL BIT TIME
5 Clocks
40 Clocks
WORD GAP TIME
40 Clocks
320 Clocks
The word counter detects when all loaded positions have been
transmitted and sets the transmitter ready flag, TX/R, high.
Repeater mode of operation allows a data word that has been
received by the HI-3584A to be placed directly into the transmitter
FIFO. Repeater operation is similar to normal receiver operation.
In normal operation, either byte of a received data word may be
read from the receiver latches first by use of SEL input. During
repeater operation however, the lower byte of the data word must
be read first. This is necessary because, as the data is being
read, it is also being loaded into transmitter FIFO which is always
loaded with the lower byte of the data word first. Signal flow for
repeater operation is shown in the Timing Diagrams section.
Please refer to the Holt AN-300 Application Note for additional
information and recommendations on lightning protection of Holt
line drivers and line receivers.
On a Master Reset data transmission and reception are
immediately terminated, all three FIFOs are cleared as are the
FIFO flags at the device pins and in the Status Register. The
Control Register is not affected by a Master Reset.
429DO
HIGH SPEED
LOW SPEED
TRANSMITTER PARITY
SELF TEST
SYSTEM OPERATION
The parity generator counts the Ones in the 31-bit word.
If
control register bit CR12 is set low, the 32nd bit transmitted will
make parity odd.
If the control bit is, high the parity is even.
Setting CR4 to a Zero bypasses the parity generator, and allows
32 bits of data to be transmitted.
If control register bit CR5 is set low, the transmitter serial output
data are internally connected to each of the two receivers,
bypassing the analog interface circuitry. Data is passed unmodi-
fied to receiver 1 and inverted to receiver 2. The serial data from
the transmitter is always present on the 429DO and
outputs regardless of the state of CR5.
The two receivers are independent of the transmitter. Therefore,
control of data exchanges is strictly at the option of the user. The
only restrictions are:
1. The received data will be overwritten if the receiver FIFO
is full and at least one location is not retrieved before the
next complete ARINC word is received.
2. The transmitter FIFO can store 32 words maximum and
ignores attempts to load additional data if full.
429DO
The HI-3584A-15 option is similar to the HI-3584A with the excep-
tion that it allows an external 15 Kohm resistor to be added in se-
ries with each ARINC input without affecting the ARINC input
thresholds. This option is especially useful in applications where
lightning protection circuitry is also required.
Each side of the ARINC bus must be connected through a 15
Kohm series resistor in order for the chip to detect the correct
ARINC levels. The typical 10 volt differential signal is translated
and input to a window comparator and latch. The comparator
levels are set so that with the external 15 Kohm resistors, they are
just below the standard 6.5 volt minimum ARINC data threshold
and just above the standard 2.5 volt maximum ARINC null
threshold.
The HI-3584A may be operated at clock frequencies beyond that
required for ARINC compliant operation. For operation at Master
Clock (CLK) frequencies up to 5MHz, please contact Holt appli-
cations engineering.
HIGH SPEED OPERATION
MR
FUNCTIONAL DESCRIPTION (cont.)
HI-3584A
HOLT INTEGRATED CIRCUITS
7


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