| Line 1... |
Line 1... |
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
--
|
--
|
-- The serial input/output unit.
|
-- The serial input/output unit.
|
--
|
--
|
-- $Id: t400_sio.vhd,v 1.1.1.1 2006-05-06 01:56:45 arniml Exp $
|
-- $Id: t400_sio.vhd,v 1.2 2006-05-06 13:34:58 arniml Exp $
|
--
|
--
|
-- Copyright (c) 2006 Arnim Laeuger (arniml@opencores.org)
|
-- Copyright (c) 2006 Arnim Laeuger (arniml@opencores.org)
|
--
|
--
|
-- All rights reserved
|
-- All rights reserved
|
--
|
--
|
| Line 102... |
Line 102... |
signal dec_sio_s : boolean;
|
signal dec_sio_s : boolean;
|
|
|
signal new_sio_s,
|
signal new_sio_s,
|
sio_q : unsigned(dw_range_t);
|
sio_q : unsigned(dw_range_t);
|
signal skl_q : std_logic;
|
signal skl_q : std_logic;
|
|
signal phi1_en_q : std_logic;
|
|
|
signal so_s,
|
signal so_s,
|
sk_s : std_logic;
|
sk_s : std_logic;
|
|
|
signal vdd_s : std_logic;
|
signal vdd_s : std_logic;
|
| Line 123... |
Line 124... |
seq: process (ck_i, por_i)
|
seq: process (ck_i, por_i)
|
begin
|
begin
|
if por_i then
|
if por_i then
|
sio_q <= (others => '0');
|
sio_q <= (others => '0');
|
skl_q <= '1';
|
skl_q <= '1';
|
|
phi1_en_q <= '1';
|
si_q <= '1';
|
si_q <= '1';
|
si_flt_q <= SI_LOW_0;
|
si_flt_q <= SI_LOW_0;
|
si_0_ok_q <= false;
|
si_0_ok_q <= false;
|
si_1_ok_q <= false;
|
si_1_ok_q <= false;
|
|
|
elsif ck_i'event and ck_i = '1' then
|
elsif ck_i'event and ck_i = '1' then
|
if res_i then
|
if res_i then
|
-- synchronous reset upon external reset event
|
-- synchronous reset upon external reset event
|
skl_q <= '1';
|
skl_q <= '1';
|
|
phi1_en_q <= '1';
|
else
|
else
|
if in_en_i then
|
if in_en_i then
|
-- sample asynchronous SI input
|
-- sample asynchronous SI input
|
si_q <= si_i;
|
si_q <= si_i;
|
end if;
|
end if;
|
| Line 156... |
Line 159... |
|
|
else
|
else
|
sio_q <= new_sio_s;
|
sio_q <= new_sio_s;
|
end if;
|
end if;
|
|
|
|
if ck_en_i then
|
|
-- delay enable of PHI1 by one clock cycle
|
|
-- this prevents glitches on sk_o when enabling/disabling
|
|
-- sk_o as a clock output
|
|
phi1_en_q <= skl_q;
|
|
end if;
|
|
|
end if;
|
end if;
|
end if;
|
end if;
|
end process seq;
|
end process seq;
|
--
|
--
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
| Line 265... |
Line 275... |
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
-- Output mapping
|
-- Output mapping
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
sio_o <= std_logic_vector(new_sio_s);
|
sio_o <= std_logic_vector(new_sio_s);
|
so_s <= en3_i and (en0_i or sio_q(3));
|
so_s <= en3_i and (en0_i or sio_q(3));
|
sk_s <= skl_q and (en0_i or phi1_i);
|
sk_s <= phi1_en_q and (en0_i or phi1_i);
|
so_o <= io_out_f(dat => so_s, opt => opt_so_output_type_g);
|
so_o <= io_out_f(dat => so_s, opt => opt_so_output_type_g);
|
so_en_o <= io_en_f (en => vdd_s,
|
so_en_o <= io_en_f (en => vdd_s,
|
dat => so_s, opt => opt_so_output_type_g);
|
dat => so_s, opt => opt_so_output_type_g);
|
sk_o <= io_out_f(dat => sk_s, opt => opt_sk_output_type_g);
|
sk_o <= io_out_f(dat => sk_s, opt => opt_sk_output_type_g);
|
sk_en_o <= io_en_f (en => vdd_s,
|
sk_en_o <= io_en_f (en => vdd_s,
|
| Line 280... |
Line 290... |
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
-- File History:
|
-- File History:
|
--
|
--
|
-- $Log: not supported by cvs2svn $
|
-- $Log: not supported by cvs2svn $
|
|
-- Revision 1.1.1.1 2006/05/06 01:56:45 arniml
|
|
-- import from local CVS repository, LOC_CVS_0_1
|
|
--
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
|
|
No newline at end of file
|
No newline at end of file
|
