GenLib User's Manual
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DPGEN_SHIFT

Name

DPGEN_SHIFT -- Shifter Macro-Generator

Synopsis

#include  <genlib.h>

void GENLIB_MACRO(DPGEN_SHIFT, char *modelname, long flags, long N);

Description

Generate a N bits shifter with name modelname.

How it works :

if the op[0] signal is set to '1' performs a right shift, performs a left shift otherwise.
if the op[1] signal is set to '1' performs an arithmetic shift (only meaningful in case of a right shift).
shamt : specifies the shift amount. The width of this signal (Y) is computed from the operator's width : Y = ceil(log₂(N)) - 1.

Terminal Names

op : select the kind of shift (input, 2 bit).
shamt : the shift amount (input, Y bits).
i : value to shift (input, N bits).
o : output (N bits).
vdd : power.
vss : ground.

Example

GENLIB_MACRO(DPGEN_SHIFT, "model_shift_32",
                          F_BEHAV|F_PLACE,
                          32);

GENLIB_LOINS("model_shift_32",
             "instance1_shift_32", 
             "op[1:0]", 
             "shamt[4:0]", 
             "x[31:0]", 
             "y[31:0]", 
             "vdd", "vss", NULL);

See Also

GENLIB_MACRO(3), genlib(1)

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