DPGEN_SHIFT.3alc man page

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)

Info

30 July 2004 ASIM/LIP6 Alliance - genlib User's Manual