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Altera_Forum's avatar
Altera_Forum
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11 years ago

What is the function of clock frequency of clock source in Qsys?

When we make a design in qsys, at beginning there is always a clock source module. I try to check the document of this IP but it seems there is no document available. It looks like this module is jus...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

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The clock frequency may or may not be used by modules that are connected to that clock.

For example, an SPI controller that is supposed to operate from a 1MHz serial clock would implement a 25x divider if it knew that it was connected to a 25MHz clock. Similar for a UART, etc.

It is an informational parameter, which may or may not have importance in your system.

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If this is an informational parameter, that make sense. This can tell other designers what the expected input clock frequency for this qsys sub system.

Thanks very much.