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W11 CPU core and support modules
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gray_cnt_gen.vhd
Go to the documentation of this file.
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-- $Id: gray_cnt_gen.vhd 1181 2019-07-08 17:00:50Z mueller $
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-- SPDX-License-Identifier: GPL-3.0-or-later
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-- Copyright 2007- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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--
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------------------------------------------------------------------------------
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-- Module Name: gray_cnt_gen - syn
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-- Description: Generic width Gray code counter
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--
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-- Dependencies: -
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-- Test bench: -
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-- Target Devices: generic
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-- Tool versions: xst 8.1-14.7; viv 2014.4-2015.4; ghdl 0.18-0.33
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-- Revision History:
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-- Date Rev Version Comment
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-- 2007-12-26 106 1.0 Initial version
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------------------------------------------------------------------------------
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library
ieee
;
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use
ieee.std_logic_1164.
all
;
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use
work.
slvtypes
.
all
;
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use
work.
genlib
.
all
;
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entity
gray_cnt_gen
is
-- gray code counter, generic vector
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generic
(
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DWIDTH
:
positive
:=
4
)
;
-- data width
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port
(
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CLK
:
in
slbit
;
-- clock
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RESET
:
in
slbit
:=
'
0
'
;
-- reset
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CE
:
in
slbit
:=
'
1
'
;
-- count enable
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DATA
:
out
slv
(
DWIDTH
-
1
downto
0
)
-- data out
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)
;
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end
entity
gray_cnt_gen
;
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architecture
syn
of
gray_cnt_gen
is
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begin
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assert
DWIDTH
>=
4
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report
"assert(DWIDTH>=4): only 4 or more bit width supported"
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severity
failure
;
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GRAY_4
:
if
DWIDTH
=
4
generate
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begin
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CNT :
gray_cnt_4
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port
map
(
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CLK
=>
CLK
,
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RESET
=>
RESET
,
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CE
=>
CE
,
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DATA
=>
DATA
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)
;
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end
generate
GRAY_4
;
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GRAY_5
:
if
DWIDTH
=
5
generate
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begin
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CNT :
gray_cnt_5
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port
map
(
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CLK
=>
CLK
,
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RESET
=>
RESET
,
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CE
=>
CE
,
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DATA
=>
DATA
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)
;
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end
generate
GRAY_5;
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GRAY_N
:
if
DWIDTH
>
5
generate
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begin
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CNT :
gray_cnt_n
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generic
map
(
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DWIDTH
=>
DWIDTH
)
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port
map
(
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CLK
=>
CLK
,
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RESET
=>
RESET
,
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CE
=>
CE
,
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DATA
=>
DATA
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)
;
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end
generate
GRAY_N;
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end
syn;
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genlib
Definition:
genlib.vhd:32
gray_cnt_4
Definition:
gray_cnt_4.vhd:29
gray_cnt_4.CE
in CE slbit := '1'
Definition:
gray_cnt_4.vhd:33
gray_cnt_4.DATA
out DATA slv4
Definition:
gray_cnt_4.vhd:35
gray_cnt_4.CLK
in CLK slbit
Definition:
gray_cnt_4.vhd:31
gray_cnt_4.RESET
in RESET slbit := '0'
Definition:
gray_cnt_4.vhd:32
gray_cnt_5
Definition:
gray_cnt_5.vhd:29
gray_cnt_5.CE
in CE slbit := '1'
Definition:
gray_cnt_5.vhd:33
gray_cnt_5.DATA
out DATA slv5
Definition:
gray_cnt_5.vhd:35
gray_cnt_5.CLK
in CLK slbit
Definition:
gray_cnt_5.vhd:31
gray_cnt_5.RESET
in RESET slbit := '0'
Definition:
gray_cnt_5.vhd:32
gray_cnt_gen.syn
Definition:
gray_cnt_gen.vhd:36
gray_cnt_gen
Definition:
gray_cnt_gen.vhd:24
gray_cnt_gen.CE
in CE slbit := '1'
Definition:
gray_cnt_gen.vhd:30
gray_cnt_gen.DWIDTH
DWIDTH positive := 4
Definition:
gray_cnt_gen.vhd:26
gray_cnt_gen.CLK
in CLK slbit
Definition:
gray_cnt_gen.vhd:28
gray_cnt_gen.DATA
out DATA slv( DWIDTH- 1 downto 0)
Definition:
gray_cnt_gen.vhd:32
gray_cnt_gen.RESET
in RESET slbit := '0'
Definition:
gray_cnt_gen.vhd:29
gray_cnt_n
Definition:
gray_cnt_n.vhd:42
gray_cnt_n.DWIDTH
DWIDTH positive := 8
Definition:
gray_cnt_n.vhd:44
gray_cnt_n.CE
in CE slbit := '1'
Definition:
gray_cnt_n.vhd:48
gray_cnt_n.CLK
in CLK slbit
Definition:
gray_cnt_n.vhd:46
gray_cnt_n.DATA
out DATA slv( DWIDTH- 1 downto 0)
Definition:
gray_cnt_n.vhd:50
gray_cnt_n.RESET
in RESET slbit := '0'
Definition:
gray_cnt_n.vhd:47
slvtypes
Definition:
slvtypes.vhd:28
slvtypes.slbit
std_logic slbit
Definition:
slvtypes.vhd:30
slvtypes.slv
std_logic_vector slv
Definition:
slvtypes.vhd:31
vlib
genlib
gray_cnt_gen.vhd
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