HI-8584
December 2005
Enhanced ARINC 429
Serial Transmitter and Dual Receiver
FEATURES
!
ARINC specification 429 compatible
!
Dual receiver and transmitter interface
!
Analog line receivers connect directly to
ARINC bus
!
Programmable label recognition
!
On-chip 16 label memory for each receiver
!
32 x 32 FIFOs each receiver and transmitter
!
Independent data rate selection for
transmitter and each receiver
!
Status register
!
Data scramble control
!
32nd transmit bit can be data or parity
!
Self test mode
!
Low power
!
Industrial & full military temperature ranges
GENERAL DESCRIPTION
The HI-8584 from Holt Integrated Circuits is a silicon gate
CMOS device for interfacing a 16-bit parallel data bus to the
ARINC 429 serial bus. The HI-8584 design offers many
enhancements to the industry standard HI-8282
architecture. The device provides two receivers each with
label recognition, a 32 by 32 FIFO, and an analog line
receiver. Up to 16 labels may be programmed for each
receiver. The independent transmitter also has a 32 by 32
FIFO. The status of all three FIFOs can be monitored using
the external status pins or by polling the HI-8584’s status
register.
Other new features include a programmable option of data
or parity in the 32nd bit, and the ability to unscramble the 32
bit word. Also, versions are available with different values
of input resistance to allow users to more easily add
external lightning protection circuitry. The device can be
used at nonstandard data rates when an option pin, NFD, is
invoked.
The 16-bit parallel data bus exchanges the 32-bit ARINC
data word in two steps when either loading the transmitter
or interrogating the receivers. The databus and all control
signals are CMOS and TTL compatible.
The HI-8584 applies the ARINC protocol to the receivers
and transmitter. Timing is based on a 1 Megahertz clock.
Additional interface circuitry such as the Holt HI-8585,
HI-8586 or HI-3182 is required to translate the transmit-
ter’s 5 volt logic outputs to ARINC 429 drive levels.
PIN CONFIGURATION
(Top View)
52 - D/R1
51 - RIN2B
50 - RIN2A
49 - RIN1B
48 - RIN1A
47 - VDD
46 - N/C
45 - N/C
44 - MR
43 - TXCLK
42 - CLK
41 - RSR
40 - N/C
APPLICATIONS
!
Avionics data communication
!
Serial to parallel conversion
!
Parallel to serial conversion
FF1 - 1
HF1 - 2
D/R2 - 3
FF2 - 4
HF2 - 5
SEL - 6
EN1 - 7
EN2 - 8
BD15 - 9
BD14 - 10
BD13 - 11
BD12 - 12
BD11 - 13
HI-8584PQI
&
HI-8584PQT
39 - N/C
38 - CWSTR
37 - ENTX
36 - N/C
35 - 429DO
34 - 429DO
33 - N/C
32 - FFT
31 - HFT
30 - TX/R
29 - PL2
28 - PL1
27 - BD00
52 - Pin Plastic Quad Flat Pack (PQFP)
(See page 13 for additional pin configuration)
(DS8584 Rev. C)
HOLT INTEGRATED CIRCUITS
www.holtic.com
BD10 - 14
BD09 - 15
BD08 - 16
BD07 - 17
BD06 - 18
N/C - 19
GND - 20
NFD - 21
BD05 - 22
BD04 - 23
BD03 - 24
BD02 - 25
BD01 - 26
12/05
HI-8584
PIN DESCRIPTIONS
SIGNAL
VDD
RIN1A
RIN1B
RIN2A
RIN2B
D/R1
FF1
HF1
D/R2
FF2
HF2
SEL
EN1
EN2
BD15
BD14
BD13
BD12
BD11
BD10
BD09
BD08
BD07
BD06
GND
BD05
BD04
BD03
BD02
BD01
BD00
PL1
PL2
TX/R
HFT
FFT
429DO
429DO
ENTX
CWSTR
RSR
NFD
CLK
TX CLK
MR
FUNCTION
POWER
INPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
POWER
I/O
I/O
I/O
I/O
I/O
I/O
INPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT
INPUT
OUTPUT
INPUT
DESCRIPTION
+5V ±5%
ARINC receiver 1 positive input
ARINC receiver 1 negative input
ARINC receiver 2 positive input
ARINC receiver 2 negative input
Receiver 1 data ready flag
FIFO full Receiver 1
FIFO Half full, Receiver 1
Receiver 2 data ready flag
FIFO full Receiver 2
FIFO Half full, Receiver 2
Receiver data byte selection (0 = BYTE 1) (1 = BYTE 2)
Data Bus control, enables receiver 1 data to outputs
Data Bus control, enables receiver 2 data to outputs if EN1 is high
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
0V
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
Latch enable for byte 1 entered from data bus to transmitter FIFO.
Latch enable for byte 2 entered from data bus to transmitter FIFO. Must follow PL1.
Transmitter ready flag. Goes low when ARINC word loaded into FIFO. Goes high
after transmission and FIFO empty.
Transmitter FIFO Half Full
Transmitter FIFO Full
“ONES” data output from transmitter
“ZEROS” data output from transmitter
Enable Transmission
Clock for control word register
Read Status Register if SEL=0, read Control Register if SEL=1
No frequency discrimination if low (pull-up)
Master Clock input
Transmitter Clock equal to Master Clock (CLK), divided by either 10 or 80.
Master Reset, active low
HOLT INTEGRATED CIRCUITS
2
HI-8584
FUNCTIONAL DESCRIPTION
CONTROL WORD REGISTER
The HI-8584 contains a 16-bit control register which is used to con-
figure the device. The control register bits CR0 - CR15 are loaded
from BD00 - BD15 when CWSTR is pulsed low. The control regis-
ter contents are output on the databus when SEL = 1 and RSR is
pulsed low. Each bit of the control register has the following func-
tion:
CR
Bit
CR0
STATUS REGISTER
The HI-8584 contains a 9-bit status register which can be interro-
gated to determine the status of the ARINC receivers, data FIFOs
and transmitter. The contents of the status register are output on
BD00 - BD08 when the RSR pin is taken low and SEL = 0. Unused
bits are output as zeros. The following table defines the status reg-
ister bits.
SR
FUNCTION
Receiver 1
Data clock
Select
Label Memory
Read / Write
STATE
0
1
0
1
DESCRIPTION
Data rate = CLK/10
Data rate = CLK/80
Normal operation
Load 16 labels using PL1 / PL2
Read 16 labels using EN1 / EN2
Disable label recognition
Bit
SR0
FUNCTION
Data ready
(Receiver 1)
STATE
0
1
DESCRIPTION
Receiver 1 FIFO empty
Receiver 1 FIFO contains valid data
Resets to zero when all data has
been read. D/R1 pin is the inverse of
this bit
Receiver 1 FIFO holds less than 16
words
Receiver 1 FIFO holds at least 16
words. HF1 pin is the inverse of
this bit.
Receiver 1 FIFO not full
Receiver 1 FIFO full. To avoid data
loss, the FIFO must be read within
one ARINC word period. FF1 pin is
the inverse of this bit
Receiver 2 FIFO empty
Receiver 2 FIFO contains valid data
Resets to zero when all data has
been read. D/R2 pin is the inverse of
this bit
Receiver 2 FIFO holds less than 16
words
Receiver 2 FIFO holds at least 16
words. HF2 pin is the inverse of
this bit.
Receiver 2 FIFO not full
Receiver 2 FIFO full. To avoid data
loss, the FIFO must be read within
one ARINC word period. FF2 pin is
the inverse of this bit
Transmitter FIFO not empty
Transmitter FIFO empty.
Transmitter FIFO not full
Transmitter FIFO full. FFT pin is the
inverse of this bit.
Transmitter FIFO contains less than
16 words
Transmitter FIFO contains at least
16 words.HFT pin is the
inverse of this bit.
CR1
SR1
FIFO half full
(Receiver 1)
0
1
CR2
Enable Label
Recognition
(Receiver 1)
Enable Label
Recognition
(Receiver 2)
Enable
32nd bit
as parity
Self Test
0
1
0
1
0
1
0
Enable label recognition
Disable Label Recognition
SR2
Enable Label recognition
Transmitter 32nd bit is data
Transmitter 32nd bit is parity
The 429DO and 429DO digital
outputs are internally connected
to the receiver logic inputs
Normal operation
Receiver 1 decoder disabled
SR4
ARINC bits 9 and 10 must match
CR7 and CR8
If receiver 1 decoder is enabled,
the ARINC bit 9 must match this bit
If receiver 1 decoder is enabled,
the ARINC bit 10 must match this bit
Receiver 2 decoder disabled
ARINC bits 9 and 10 must match
CR10 and CR11
SR6
If receiver 2 decoder is enabled,
the ARINC bit 9 must match this bit
If receiver 2 decoder is enabled,
the ARINC bit 10 must match this bit
Transmitter 32nd bit is Odd parity
Transmitter 32nd bit is Even parity
Data rate=CLK/10, O/P slope=1.5us
1
Data rate=CLK/80, O/P slope=10us
Data rate=CLK/10
Data rate=CLK/80
Scramble ARINC data
Unscramble ARINC data
SR8
Transmitter FIFO
half full
0
SR7
Transmitter FIFO
empty
Transmitter FIFO
full
0
1
0
1
SR5
FIFO full
(Receiver 2)
0
1
FIFO half full
(Receiver 2)
0
1
SR3
Data ready
(Receiver 2)
0
1
FIFO full
(Receiver 1)
0
1
CR3
CR4
CR5
1
CR6
Receiver 1
decoder
0
1
CR7
CR8
CR9
-
-
Receiver 2
Decoder
-
-
0
1
CR10
CR11
CR12
-
-
Invert
Transmitter
parity
Transmitter
data clock
select
Receiver 2
data clock
select
Data
format
-
-
0
1
0
1
0
1
0
1
CR13
CR14
CR15
HOLT INTEGRATED CIRCUITS
3
HI-8584
FUNCTIONAL DESCRIPTION (cont.)
ARINC 429 DATA FORMAT
Control register bit CR15 is used to control how individual bits in the
received or transmitted ARINC word are mapped to the HI-8584
data bus during data read or write operations. The following table
describes this mapping:
BYTE 1
DATA
BUS
ARINC
BIT
CR15=0
ARINC
BIT
CR15=1
BD BD BD BD BD BD BD BD BD BD BD BD BD BD BD BD
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
13 12 11 10
9
31 30 32
1
2
3
4
5
6
7
8
The HI-8584 guarantees recognition of these levels with a common
mode Voltage with respect to GND less than ±4 for the worst case
condition (4.75V supply and 13V signal level).
The tolerances in the design guarantee detection of the above
levels, so the actual acceptance ranges are slightly larger. If the
ARINC signal is out of the actual acceptance ranges, including the
nulls, the chip rejects the data.
RECEIVER LOGIC OPERATION
Figure 2 shows a block diagram of the logic section of each receiver.
BIT TIMING
The ARINC 429 specification contains the following timing specifi-
cation for the received data:
HIGH SPEED
LOW SPEED
100K BPS ± 1% 12K -14.5K BPS
BIT RATE
10 ± 5 µsec
PULSE RISE TIME
1.5 ± 0.5 µsec
10 ± 5 µsec
PULSE FALL TIME
1.5 ± 0.5 µsec
5 µsec ± 5% 34.5 to 41.7 µsec
PULSE WIDTH
If the NFD pin is high, the HI-8584 accepts signals that meet these
specifications and rejects outside the tolerances. The way the
logic operation achieves this is described below:
Parity
Label
16 15 14 13 12 11 10
9
8
Label
7
Label
6
Label
5
Label
4
Label
3
Label
2
BYTE 2
DATA
BUS
ARINC
BIT
CR15=0
ARINC
BIT
CR15=1
BD BD BD BD BD BD BD BD BD BD BD BD BD BD BD BD
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
Parity
Label
Label
Label
Label
Label
Label
Label
Label
SDI
SDI
Label
1
SDI
SDI
THE RECEIVERS
ARINC BUS INTERFACE
Figure 1 shows the input circuit for each receiver. The ARINC 429
specification requires the following detection levels:
STATE
ONE
NULL
ZERO
DIFFERENTIAL VOLTAGE
+6.5 Volts to +13 Volts
+2.5 Volts to -2.5 Volts
-6.5 Volts to -13 Volts
1. Key to the performance of the timing checking logic is an
accurate 1MHz clock source. Less than 0.1% error is recom-
mended.
2. The sampling shift registers are 10 bits long and must
show three consecutive Ones, Zeros or Nulls to be consid-
ered valid data. Additionally, for data bits, the One or Zero in
the upper bits of the sampling shift registers must be followed
by a Null in the lower bits within the data bit time. For a Null in
the word gap, three consecutive Nulls must be found in both
the upper and lower bits of the sampling shift register. In this
manner the minimum pulse width is guaranteed.
3. Each data bit must follow its predecessor by not less than
8 samples and no more than 12 samples. In this manner the
bit rate is checked. With exactly 1MHz input clock frequency,
the acceptable data bit rates are as follows:
HIGH SPEED
LOW SPEED
10.4K BPS
15.6K BPS
V
DD
RIN1A
OR
RIN2A
GND
DIFFERENTIAL
AMPLIFIERS
COMPARATORS
ONES
DATA BIT RATE MIN
DATA BIT RATE MAX
83K BPS
125K BPS
NULL
V
DD
RIN1B
OR
RIN2B
GND
ZEROES
4. The Word Gap timer samples the Null shift register every
10 input clocks (80 for low speed) after the last data bit of a
valid reception. If the Null is present, the Word Gap counter is
incremented. A count of 3 will enable the next reception.
If NFD is held low, frequency discrimination is disabled and any
data stream totaling 32 bits is accepted even with gaps between
bits. The protocol still requires a word gap as defined in 4. above.
FIGURE 1. ARINC RECEIVER INPUT
HOLT INTEGRATED CIRCUITS
4
HI-8584
FUNCTIONAL DESCRIPTION (cont.)
RECEIVER PARITY
The receiver parity circuit counts Ones received, including the
parity bit. If the result is odd, then "0" will appear in the 32nd bit.
CR2(3) ARINC word CR6(9) ARINC word
matches
bits 9,10
label
match
CR7,8 (10,11)
0
1
1
0
0
1
1
1
1
X
No
Yes
X
X
Yes
No
No
Yes
0
0
0
1
1
1
1
1
1
X
X
X
No
Yes
No
Yes
No
Yes
FIFO
RETRIEVING DATA
Once 32 valid bits are recognized, the receiver logic generates an
End of Sequence (EOS). Depending upon the state of control
register bits CR2-CR11, the received ARINC 32-bit word is then
checked for correct decoding and label matching before being
loaded into the 32 x 32 receive FIFO. ARINC words which do not
meet the necessary 9th and 10th ARINC bit or label matching are
ignored and are not loaded into the receive FIFO. The following
table describes this operation.
Load FIFO
Ignore data
Load FIFO
Ignore data
Load FIFO
Ignore data
Ignore data
Ignore data
Load FIFO
TO PINS
SEL
EN
MUX
CONTRO
L
32 TO 16 DRIVER
R/W
CONTROL
CONTROL
BITS
HF
FF
D/R
FIFO
LOAD
CONTROL
32 X 32
FIFO
CONTROL
BIT
/
16 x 8
LABEL
MEMORY
LABEL /
DECODE
COMPARE
CONTROLBITS
CR0, CR14
CLOCK
OPTION
CLOCK
CLK
32 BIT SHIFT REGISTER
DATA
BIT CLOCK
PARITY
CHECK
32ND
BIT
BIT
COUNTER
AND
END OF
SEQUENCE
EOS
ONES
SHIFT REGISTER
WORD GAP
WORD GAP
TIMER
BIT CLOCK
START
NULL
SHIFT REGISTER
SEQUENCE
CONTROL
END
ZEROS
SHIFT REGISTER
ERROR
ERROR
DETECTION
CLOCK
FIGURE 2.
RECEIVER BLOCK DIAGRAM
HOLT INTEGRATED CIRCUITS
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