Embedded System Design by Frank Vahid; Tony Givargis

By Frank Vahid; Tony Givargis

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I ! i I ! 5 . 7 .. 'r·- ....... . .. ~· - - I 1 Introduction A general-purpose processor is a programmable digital system intended to solve computation problems in a large variety of applications. as diverse as communication, automotive, and industrial embedded systems. An embedded-system designer choosing to use a generalpurpose processor to implement part of a system;s functionality may achieve several benefits. st of the processor may be very low, often a few dollars or less; One reason for this low cost is that the processor manufacturer can spread its NRE cost for, the processor's design over large numbers of units, often numbering in the millions or billions.

States 6-J and 5-J can be eliminated, with the transitions from states 7 and 8 pointing directly to state 5. Likewise, state 1-J can be eliminated. The resulting reduced FSMD is shown in Figure 2. l5(b). We reduced the FSMD from thirteen states to only six states. Be careful, though, to avoid the common mistake of assuming that a variabie assigned in a state can have the newly assigned value read on an outgoing arc of that state! The original FSMD could also have had too few states to be efficient in terms of hardware size.

We f f assume we are building a synchronous circuit, so the bridge has a clock input - in our FSMD, every transition is implicitly ANDed with the clock. i4. 14(b), using the four-step process outlined before. We add registers for data_hi and data_Jo, as well as for the output data_out. functional units sin~ there are no arithmetic operations. We connect the registers according to the assignments in the FS'MD; no multiplexors are necessary. We create unique identifiers for the register control signals.

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Embedded System Design by Frank Vahid; Tony Givargis
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