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The system provides eight flags (which are referred to as semaphores or locks in the literature) to allow various processors to access resources that are shared in an orderly manner. This is done by setting and clearing the semaphores. The semaphore system is not a concern for beginners, but we should have an awareness of the existence of these flags so that when we come up against these difficulties, we will know that the solutions have already been implemented by the machine designers.
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The shared memory consists of 32KB of hub memory organized as 512 longs. Part of this memory is reserved for special-purpose registers that determine internal cog relationships. These are listed in the owner s manual.
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The system clock coordinates the operation of all the hardware items in an orderly fashion. The system clock rate can be controlled by the Propeller chip (although none of the programs in this book use that capability). The resister/capacitor combinations internal to the system allow the system clock rate to be used without an external crystal. It is also possible to use an external crystal to set the clock rate and use a multiplier to
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increase it. The decisions as to which system will be used and the frequency at which the system will run are made by the programmer and the hardware designer, depending on how the system is to be used. For most of our experiments, we will use the 5 MHz crystal that comes with the education kit. We will use a multiplier of 2 for an effective rate of 10 MHz for the clock. We specify the operational frequency at the top of the program under the Constants assignment. As beginners, we do not need to be concerned about the finer details of how the system clock operates. Leave it at 10 MHz for all the experiments for now.
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The program is written with the Propeller Tool, which provides a complete programming environment. If you prefer, the program can be written in Word or any other word processing program and then cut and paste it into the Propeller Tool. If you want to have circuitry as a part of the program documentation, the circuitry must be created in the Propeller Tool environment with the Parallax font. Once written, the program can be transferred either to RAM or EEPROM and executed from either one. In either case, the program has to be loaded into the main memory of the Propeller under consideration before it can be executed. If the program is in Assembly code, that code will be executed as such. If the program is written in Spin, it will be interpreted by the Spin Interpreter during run time and executed.
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The ROM
The read-only memory contains the Spin Interpreter, math tables for generating all the related mathematical functions, sin and log tables for making mathematical calculations, and font descriptions for the font used by the system. For now, we do not need to worry about how all this takes place because it happens automatically, in the background, when we are using the Spin language.
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Special TermS and ideaS
This chapter introduces you to several new terms and ideas used by the parallelprocessing discipline that cover the new concepts, software, and hardware created for working in a parallel-processing environment. The ideas we are interested in are expressed in the Spin language environment, as implemented by Parallax, to allow us to program the Propeller chip. The Parallax software engineers have decided to design the Spin language in a way that you will find both easy to use and powerful once you get used to its structure. They also decided to coin a few terms that allow us to differentiate discussions in and about this language to provide a certain amount of semantic isolation. For most of us, parallel processing is a new concept. Even fairly competent programmers need to rethink how they approach a problem before they start to program in a parallel environment. The major concept that has to be addressed is assigning the various parallel tasks to the eight processors in an intelligent fashion. This can be done in two ways. In the first, we write a program just as we would for a one-processor linear system, and the computer is so smart that it figures what has to be done and how it is to be done in a multiprocessor system. The second method involves the programmer breaking the task down into well-thought-out subtasks and then assigning the subtasks to the eight processors, as appropriate. Because each cog is capable of doing more than one thing, the problem lends itself to elegant and innovative solutions. As things stand as of this writing, the artificial intelligence needed to allow the computer to assign the tasks autonomously does not exist for the Propeller. We have to resign ourselves to assigning the tasks to the various subprocessors individually as we design the application.
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