Cog and Hub interaction is critical to the Propeller chip. The Hub determines which one of the Cogs (Processors) has access mutually exclusive Shared Resources at a given moment, such as Main Memory, configuration registers, etc. The Hub gives exclusive access to each cog one at a time in a “round robin” fashion, regardless of how many cogs are running, in order to keep timing deterministic.
P8X32A Block Diagram
Propeller Help Version 1.1
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5/13/2009