Fal::getFileReferenceByUid() 

\nn\t3::Fal()->getFileReferenceByUid($uid = NULL); 

Retrieves a SysFileReference based on the uid Alias to \nn\t3::Convert( $uid )->toFileReference();

\nn\t3::Fal()->getFileReferenceByUid( 123 );
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@param $uid
@return \TYPO3\CMS\Extbase\Domain\Model\FileReference

Source Code 

public function getFileReferenceByUid( $uid = null )
{
	return \nn\t3::Convert( $uid )->toFileReference();
}
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