A specification of the electronic design is created in response to selection of blocks from a library, and at least one of the blocks is available for implementation in a selectable one of {HEAD ~ a software implementation} for {TAIL ~ an embedded processor} on a programmable logic device and a hardware implementation on the PLD 
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A specification of the electronic design is created in response to selection of blocks from a library , and at least one of the blocks is available for implementation in a selectable one of { HEAD ~ a software implementation } for { TAIL ~ an embedded processor } on a programmable logic device and a hardware implementation on the PLD
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