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DPGEN_SHIFT(3) Alliance - genlib User's Manual DPGEN_SHIFT(3)

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

1.
op : select the kind of shift (input, 2 bit).
2.
shamt : the shift amount (input, Y bits).
3.
i : value to shift (input, N bits).
4.
o : output (N bits).
5.
vdd : power.
6.
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)

30 July 2004 ASIM/LIP6