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);