Aim ANET42, User Manual

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5. Structure of the ANET429
ANET429-x Users Manual 37
5.3.2 ARINC-429 Decoder
The decoder converts the serial received data stream into a parallel data double word
and generates an additional 16 bit report for each received label. The decoder
measures the gap time between two labels for gap error detection and bus load traffic
detection.
The decoder provides the following error detection capabilities:
Gap Error Detection
Bit count Error Detection
Coding Error Detection
Parity Error Detection
(if no special transmission mode is chosen)
5.3.3 External Trigger Inputs and Outputs
Three Trigger input and Three Trigger output are provided for all ANET429 variants (1
one the DSUB37, and 2 on the 15pol HD).
The Trigger I/Os are TTL level compatible. Filter circuitry is provided at the trigger inputs
and outputs to cover Electromagnetic Compatibility (EMC) aspects.
5.4 ASP Section
The low power on board Application Support Processor (ASP) is based on a System-
On-Chip (SOC) hardware and running under an embedded LINUX Operating System.
The SOC hardware offers a built-in Ethernet interface, which is used for the
implementation of the host connection via a Standard Ethernet RJ-45 connector.
Furthermore, the also SOC built-in USB interface has been made available to the user
for mounting external mass data storage devices or e.g. a WLAN stick for wireless.
5.5 Discrete I/Os
The ANET429 module provides eight user programmable Discrete-I/O signals.
Discrete input signals are always active whereas the discrete output signals are per
default inactive. An open collector circuitry is used for the discrete output with
approximately 4V provided by default. An external voltage from 0 to 35V can be
supplied externally for switching higher voltages.
Note:
The discrete outputs don’t provide a series resistor for over current protection.
In case a discrete input is used, make sure that the output-mode for that discrete is
disabled, before connecting an external voltage, otherwise a high short circuit current to
GND can damage the output transistor.