Rotate, Shift

Summary:
These functions shift or rotate the input, X, to form the result, Z.  The number of
bits to shift or rotate X is supplied by the input, S. The width of X and Z is controlled
by Width.  The width of S is chosen automatically to allow full shifting or
rotating of X (width(S)=ceil(log2(width(X)))). The logic is always optimized for minimum 
possible delay.

Function:
    Z=X<<S (Shift, Left selected)
    Z=X>>S (Shift, Left deselected)
    Z=X<<<S (Rotate, Left selected)
    Z=X>>>S (Rotate, Left deselected)

Signals:
    Z: Width wide mantissa output
    S: shift input (width chosen automatically)
    X: Width wide input

Parameters:
    Name: actual module name
    Width: width of the X and Z signals
    Signed: X is signed if selected, unsigned otherwise
    Left: X is shifted or rotated left if selected, right otherwise

Verilog Usage:  
    Name(X,S,Z);

Version: $Id: Shift.help,v 1.3 1994/09/19 22:43:23 peter Exp $