Studer OnAir 1500, Operating Instructions Manual

Page: 305 / 386

OnAir Digital Mixing Consoles
6-86 Configuration
Document generated: 06.08.14
SW V6.0
6.5.29.3 Custom Logic
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.
Restrictions 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 chapter 6.5.29.3.5 , example 3.
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.
6.5.29.3.1 Custom Logic Gates
AND Gates 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
– L
–
L L
H H H
In1 In2 In3 In4 In5 In6 Out
L L L L L L L
L – – – – – L
–
L – – – – L
– – L – – – L
– – – L – – L
– – – – L – L
– – – – – L L
H H H H H 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.