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W11 CPU core and support modules
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iob_keeper_gen.vhd
Go to the documentation of this file.
1
-- $Id: iob_keeper_gen.vhd 1181 2019-07-08 17:00:50Z mueller $
2
-- SPDX-License-Identifier: GPL-3.0-or-later
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-- Copyright 2010- 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: iob_keeper_gen - sim
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-- Description: keeper for IOB, vector
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--
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-- Dependencies: -
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-- Test bench: -
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-- Target Devices: generic Spartan, Virtex
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-- Tool versions: xst 8.1-14.7; ghdl 0.18-0.31
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-- Revision History:
14
-- Date Rev Version Comment
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-- 2010-06-03 299 1.1 add explicit R_KEEP and driver
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-- 2008-05-22 148 1.0 Initial version
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------------------------------------------------------------------------------
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library
ieee
;
20
use
ieee.std_logic_1164.
all
;
21
22
use
work.
slvtypes
.
all
;
23
use
work.
xlib
.
all
;
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entity
iob_keeper_gen
is
-- keeper for IOB, vector
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generic
(
27
DWIDTH
:
positive
:=
16
)
;
-- data port width
28
port
(
29
PAD
:
inout
slv
(
DWIDTH
-
1
downto
0
)
-- i/o pad
30
)
;
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end
iob_keeper_gen
;
32
33
-- Is't possible to directly use 'PAD<='H' in proc_pad. Introduced R_KEEP and
34
-- the explicit driver 'PAD<=R_KEEP' to state the keeper function more clearly.
35
36
architecture
sim
of
iob_keeper_gen
is
37
signal
R_KEEP
:
slv
(
DWIDTH
-
1
downto
0
)
:=
(
others
=
>
'
W
'
)
;
38
begin
39
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proc_keep:
process
(
PAD
)
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begin
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for
i
in
PAD
'
range
loop
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if
PAD
(
i
)
=
'
1
'
then
44
R_KEEP
(
i
)
<=
'
H
'
;
45
elsif
PAD
(
i
)
=
'
0
'
then
46
R_KEEP
(
i
)
<=
'
L
'
;
47
elsif
PAD
(
i
)
=
'
X
'
or
PAD
(
i
)
=
'
U
'
then
48
R_KEEP
(
i
)
<=
'
W
'
;
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end
if
;
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end
loop
;
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PAD
<=
R_KEEP
;
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end
process
proc_keep
;
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end
sim;
iob_keeper_gen.sim
Definition:
iob_keeper_gen.vhd:36
iob_keeper_gen.sim.R_KEEP
slv( DWIDTH- 1 downto 0) :=( others => 'W') R_KEEP
Definition:
iob_keeper_gen.vhd:37
iob_keeper_gen
Definition:
iob_keeper_gen.vhd:25
iob_keeper_gen.PAD
inout PAD slv( DWIDTH- 1 downto 0)
Definition:
iob_keeper_gen.vhd:30
iob_keeper_gen.DWIDTH
DWIDTH positive := 16
Definition:
iob_keeper_gen.vhd:27
slvtypes
Definition:
slvtypes.vhd:28
slvtypes.slv
std_logic_vector slv
Definition:
slvtypes.vhd:31
xlib
Definition:
xlib.vhd:35
vlib
xlib
iob_keeper_gen.vhd
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