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MB86R02 'Jade-D' Hardware Manual V1.64
Figure 22-7 Basic structure of a Sync Mixer
Basic structure of a Sync Mixer: Each of the five address lines of the 32 to 1 multiplexer
can be individually selected from any of the first-stage signals. The output is the result of a table look-
up. The register FctTable contains the truth table of the Boolean function calculated.
The concept of the sync mixers needs some explanation. In a first step the signals to be combined
are selected. These are referred to then as S0...S4 and form the address for the function table. This
function table is used to look up the result of the Boolean operation the five selected signals shall be
subject to.
An example may help understand the topic. Assuming the outputs of three Sync Pulse Generators
shall form a combined signal with the function , one would proceed as follows.
At first, the Sync Mixer signals S0...S4 are assigned the Sync Pulse Generator outputs or constant
zero by programming the respective multiplexers. The next step is to build the function's truth table,
as shown below. As the intended function has only three inputs, only eight entries need be specified.
22-36
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