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OVERVIEW
ARINC 717 is a continuous transmission of 12-bit words in 4 second
frames divided into four 1 second subframes. The programmed
data rate (32 to 8192 wps) determines the number of words per
subframe. The first word of each subframe is reserved for a unique
sync mark. Figure 5 illustrates the relationship between ARINC 717
frames, subframes and words.
The HI-3717A is comprised of independent ARINC 717 receive and
transmit sections easily accessible via a four wire SPI
communications bus. It supports the ARINC 717 Harvard Bi-Phase
(HBP) protocol as well as the Bi-Polar Return to Zero (BPRZ)
auxiliary protocol.
The receiver accepts data from either a Harvard Bi-Phase (HBP) or
a Bi-Polar Return to Zero (BPRZ) bus, recovers the clock, decodes
the data, synchronizes the ARINC 717 data frames using the
unique subframe sync marks and stores the recovered data in a 32
word x 12 bit Receive FIFO.
The ARINC 717 Transmitter accesses data from a 32 word x 12 bit
Transmit FIFO, encodes it into both HBP and BPRZ data streams at
the selected data rate, and converts the digital data stream to
ARINC 717 bus compatible outputs. There are separate outputs for
the HBP and BPRZARINC 717 buses.
The receive and transmit sections operate at the same data rate
and they are configured and monitored via the SPI interface.
Refer to Figure 1 for the Block Diagram of the HI-3717A
INITIALIZATION AND RESET
The HI-3717A generates a full reset upon application power. The
power-on-reset (POR) sets all registers to their default values,
places the Receive and Transmit FIFOs to their empty state, and
clears the sync detection logic. It also sets both the HBP and BPRZ
outputs to the high impedance state and the input sampling and
decoders are disabled. See Register Descriptions for complete
definition of the default values.
The part can also be initialized to the full reset state by applying a
100ns active low pulse to the external pin.
A software reset is also possible via the SPI communications
interface by writing a “1” to the CTRL1<3>. This bit places both the
Receive and Transmit FIFO’s in the empty state, clears the sync
detection logic, and sets both the HBP and BPRZ line drivers to a
high impedance state. . The
device is held in the reset state until a “0” is written to CTRL1<3>.
MR
All other registers remain unchanged
CONFIGURATION
The HI-3717A is configured via the SPI communications bus by
writing to Control Register 0, CTRL0, and Control Register 1,
CTRL1. They are reset to 0x00 following a Power On Reset
(POR) or a Master Reset ( ) but remain unchanged on a
Software Reset, CTRL1<3>, SRST. The function of each register
bit is shown in the Register Descriptions.
MR
In order to avoid inadvertent transceiver operation, Control
Register 0, CTRL0, should be programmed last. Writing
CTRL0 sets the desired data rate which, after one bit period,
enables the internal clocks. This in turn makes the transmitter
or receiver operational. Changing the data rate on the fly may
result in unpredictable operation during the transition to the
new programmed state. A full reset, POR or , should be
issued before reprogramming the data rate.
MR
Data Rate
Line Driver Output Slew Rates
Receiver Format
Input Synchronization Mode
For correct ARINC 717 date rate reception, transmission and bit
timing, the HI-3717A requires a 24 MHz reference clock source
applied to the ACLK input. This clock is divided down to achieve the
data rate programmed with CTRL0<6:4>. The input receive data is
8X oversampled relative to the programmed data rate.
ARINC 717 requires a basic data rate of 64 wps with support for
128, 256 and 512 wps. The HI-3717A offers an expanded range of
32 to 8192 wps for testing purposes and future expansion.
CTRL0<3>, 32WPS, overrides the state of CTRL0<6:4> and sets
the data rate to 32 wps. The required 0.1% timing tolerance is
maintained over all data rates.
The ARINC 717 format of the receiver is selectable as HBP or
BPRZ by the state in <0>, RXSEL, OR’d with the state of the
external RSEL input pin. A “0” on RSEL and <0> selects
HBP and a “1” on either RSEL or <0> selects BPRZ.
Refer to Table 3 for the detail description of each bit in Control
Register 0.
The HI-3717A has three different synchronization modes:
1. 4 Sync-Word Mode
This is the default synchronization mode at power up or after a
Master Reset. In this mode the HI-3717A searches for the four
subframe sync marks:
SYNC1 = Octal 1107
SYNC2 = Octal 2670
SYNC3 = Octal 5107
SYNC4 = Octal 6670
in the correct sequential order starting from SYNC1 and the
exact bit time determined by the programmed word rate. When
synchronization is achieved the INSYNC pin as well as the
INSYNC bit of the Receive FIFO Status Register, RXFSTAT<7>
are set to “1” on the next valid SYNC1 mark. The valid SYNC1
mark and following data words are stored in the Receive FIFO.
The slew rate of the HBP and BPRZ outputs is controllable with
CTRL0<2:1>. A 3.75µs slew rate conforms to all the required
ARINC 717 data rates. A 1.5µs is provided for higher data rates
beyond the standard. In addition, slower slew rates of 7.5µs and
10µs are available to further optimize the application.
CTRL0
CTRL0
CTRL0
FUNCTIONAL DESCRIPTION
HOLT INTEGRATED CIRCUITS
12
HI-3717A