Parallax P2 Edge Module - Datasheet

SYSTEM ORGANIZATION

The Propeller 2 includes the following subsystems.

● Cogs (processors) - independent 32-bit processing units

○ Register RAM - private memory for cog to execute code and swiftly manipulate data

○ Lookup RAM - semi-private memory for cog to execute code and manipulate data tables/streams

● Hub - access manager for exclusive shared resources

○ Hub RAM - shared memory for all cogs to execute code and manipulate data

○ System Clock - clock source for all internal components

○ Locks - 16 semaphore bits to coordinate exclusive access of shared resources

○ CORDIC Solver - pipelined calculator for math functions

● Smart I/O Pins - I/O pins with optional Smart circuit for autonomous functions

Cogs

The Propeller contains multiple processors, called cogs. Each cog has its own RAM and can start, stop, and

execute instructions independently of one another. All active cogs share the same System Clock, Hub RAM, and

I/O pins.

Cog RAM

Each cog's RAM is made of two blocks of 512 longs (512 x 32), called Register RAM and Lookup RAM, organized

as shown here.

Each cog's primary 512 x 32-bit dual-port Register RAM (Reg RAM for short) provides for code execution, fast

direct register access, and special use. It is read and written as longs (4 bytes) and contains general purpose,

dual-purpose, and special-purpose registers.

General Purpose Registers

RAM registers $000 through $1EF are general-purpose registers for code and data usage.