| Line 1... |
Line 1... |
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
--
|
--
|
-- Interface Timing Checker.
|
-- Interface Timing Checker.
|
--
|
--
|
-- $Id: if_timing.vhd,v 1.2 2004-04-25 20:40:58 arniml Exp $
|
-- $Id: if_timing.vhd,v 1.3 2004-09-12 00:31:50 arniml Exp $
|
--
|
--
|
-- Copyright (c) 2004, Arnim Laeuger (arniml@opencores.org)
|
-- Copyright (c) 2004, Arnim Laeuger (arniml@opencores.org)
|
--
|
--
|
-- All rights reserved
|
-- All rights reserved
|
--
|
--
|
| Line 195... |
Line 195... |
assert (now - last_ale_fall_s) > (t_CY / 15 - 40 ns)
|
assert (now - last_ale_fall_s) > (t_CY / 15 - 40 ns)
|
report "Timing violation of tLA on BUS vs. ALE!"
|
report "Timing violation of tLA on BUS vs. ALE!"
|
severity error;
|
severity error;
|
end if;
|
end if;
|
|
|
|
-- PSEN
|
|
if psen_n_i = '0' then
|
|
-- tRD2: PSEN to Data In
|
|
assert (now - last_psen_n_fall_s) < (t_CY * 4/15 - 170 ns)
|
|
report "Timing violation of tRD2 on BUS vs. PSEN!"
|
|
severity error;
|
|
end if;
|
|
|
end process bus_check;
|
end process bus_check;
|
--
|
--
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
|
|
|
| Line 325... |
Line 333... |
--
|
--
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
|
|
|
-----------------------------------------------------------------------------
|
-----------------------------------------------------------------------------
|
|
-- Check PSEN
|
|
--
|
|
psen_check: process (psen_n_i)
|
|
begin
|
|
case psen_n_i is
|
|
when '1' =>
|
|
-- tCC2: Control Pulse Width PSEN
|
|
assert (now - last_psen_n_fall_s) > (t_CY * 2/5 - 200 ns)
|
|
report "Timing violation of tCC2 on PSEN!"
|
|
severity error;
|
|
|
|
when '0' =>
|
|
-- tLAFC2: ALE to Control PSEN
|
|
assert (now - last_ale_fall_s) > (t_CY / 10 - 75 ns)
|
|
report "Timing violation of tLAFC2 on PSEN vs. ALE!"
|
|
severity error;
|
|
|
|
when others =>
|
|
null;
|
|
|
|
end case;
|
|
|
|
end process psen_check;
|
|
--
|
|
-----------------------------------------------------------------------------
|
|
|
|
|
|
-----------------------------------------------------------------------------
|
|
-- Check cycle overlap
|
|
--
|
|
cycle_overlap_check: process (psen_n_i,
|
|
rd_n_i,
|
|
wr_n_i)
|
|
variable tmp_v : std_logic_vector(2 downto 0);
|
|
begin
|
|
tmp_v := psen_n_i & rd_n_i & wr_n_i;
|
|
case tmp_v is
|
|
when "001" |
|
|
"010" |
|
|
"100" |
|
|
"000" =>
|
|
assert false
|
|
report "Cycle overlap deteced on PSEN, RD and WR!"
|
|
severity error;
|
|
|
|
end case;
|
|
|
|
end process cycle_overlap_check;
|
|
--
|
|
-----------------------------------------------------------------------------
|
|
|
|
|
|
-----------------------------------------------------------------------------
|
-- Monitor XTAL
|
-- Monitor XTAL
|
--
|
--
|
xtal_mon: process
|
xtal_mon: process
|
begin
|
begin
|
last_xtal_rise_s <= 0 ns;
|
last_xtal_rise_s <= 0 ns;
|
| Line 529... |
Line 590... |
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
-- File History:
|
-- File History:
|
--
|
--
|
-- $Log: not supported by cvs2svn $
|
-- $Log: not supported by cvs2svn $
|
|
-- Revision 1.2 2004/04/25 20:40:58 arniml
|
|
-- check expander timings
|
|
--
|
-- Revision 1.1 2004/04/25 16:24:10 arniml
|
-- Revision 1.1 2004/04/25 16:24:10 arniml
|
-- initial check-in
|
-- initial check-in
|
--
|
--
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
|
|
No newline at end of file
|
No newline at end of file
|
