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