Custom Logic; Custom Logic Gates - Studer OnAir 3000 Operating Instructions Manual

OnAir Digital Mixing Consoles
6.5.29.3

Custom Logic

Restrictions
6.5.29.3.1

Custom Logic Gates

AND Gates
6-86 Configuration
Custom logic was introduced in order to replace external wiring. It is con-
figurable in the Configuration Tool during commissioning the console, its
setup during manufacturing, but also later by the system administrator. By
combining several custom logic gates of any predefined type, logic circuits
can be designed that are processed in real time by the core host software. Any
combination of up to 10 cascaded gates is allowed. Feedback loops are not
allowed. If doing so anyway, an error message will be displayed. This means
that no RS flip-flops can be implemented using gates.
A custom logic gate is understood as a logical function. The status at its output
(High or Low) depends on a Boolean operation and on a certain amount of
logical inputs (arguments).
The following Boolean functions are defined as custom logic gates:
• AND (2 to 6 inputs)
• OR (2 to 6 inputs)
• XOR (exclusive OR, 2 inputs)
• NOT (inverter, 1 input).
In addition, a pulse function is available since SW V5.0.
Please note that RS flip-flops are not available in Custom Logic. Please use
'User Functions' in order to store logic states. For a configuration example
please refer to
Using custom logic on an OnAir 2500 console requires a memory upgrade to
512 MB. The configuration tool of OnAir 2500 consoles with the standard 256
MB memory displays the custom logic configuration pages, but the number
of gates is fixed to 0.
Custom logic AND gates can be defined with up to six sources ('inputs').
The output of an AND gate only goes High if all defined sources are High;
or, in other words, it goes LOW if at least one of the defined sources is Low
(the remaining sources do not matter then, i.e. '–'). Refer to the truth table
examples for two and six sources below.
In1 In2 Out
L L
L –
– L
H H
In1 In2 In3 In4 In5 In6 Out
L L
L –
– L
– –
– –
– –
– –
H H
OR Gates Custom logic OR gates can be defined with up to six sources ('inputs'). The
output of an OR gate goes High if at least one of the defined sources is High
(the remaining sources do not matter then, i.e. '–'); or, in other words, it only
goes Low if all defined sources are Low. Refer to the truth table examples for
two and six inputs below.
SW V6.0
chapter 6.5.29.3.5, example 3.
L
L
L
H
L L L L L
– – – – L
– – – – L
L – – – L
– L – – L
– – L – L
– – – L L
H H H H H
Document generated: 10.10.14