| Line 1... |
Line 1... |
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
--
|
--
|
-- The Program Memory control unit.
|
-- The Program Memory control unit.
|
-- All operations related to the Program Memory are managed here.
|
-- All operations related to the Program Memory are managed here.
|
--
|
--
|
-- $Id: pmem_ctrl.vhd,v 1.3 2004-07-11 16:51:33 arniml Exp $
|
-- $Id: pmem_ctrl.vhd,v 1.4 2005-06-08 19:13:53 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 88... |
Line 88... |
use work.t48_pack.dmem_addr_width_c;
|
use work.t48_pack.dmem_addr_width_c;
|
use work.t48_pack.page_t;
|
use work.t48_pack.page_t;
|
|
|
architecture rtl of pmem_ctrl is
|
architecture rtl of pmem_ctrl is
|
|
|
|
-- implemented counter width of Program Counter
|
|
-- the upper bit is only altered by JMP, CALL and RET(R)
|
|
subtype pc_count_range_t is natural range pmem_addr_width_c-2 downto 0;
|
|
|
-- the Program Counter
|
-- the Program Counter
|
signal program_counter_q : unsigned(pmem_addr_t'range);
|
signal program_counter_q : unsigned(pmem_addr_t'range);
|
|
|
|
|
-- the Program Memory address
|
-- the Program Memory address
|
signal pmem_addr_s,
|
signal pmem_addr_s,
|
pmem_addr_q : std_logic_vector(pmem_addr_t'range);
|
pmem_addr_q : std_logic_vector(pmem_addr_t'range);
|
|
|
begin
|
begin
|
| Line 120... |
Line 125... |
elsif write_pch_i then
|
elsif write_pch_i then
|
program_counter_q(pmem_addr_width_c-1 downto data_i'high+1) <=
|
program_counter_q(pmem_addr_width_c-1 downto data_i'high+1) <=
|
UNSIGNED(data_i(pmem_addr_width_c - dmem_addr_width_c - 1 downto 0));
|
UNSIGNED(data_i(pmem_addr_width_c - dmem_addr_width_c - 1 downto 0));
|
elsif inc_pc_i then
|
elsif inc_pc_i then
|
-- increment mode
|
-- increment mode
|
program_counter_q <= program_counter_q + 1;
|
-- the MSB is not modified by linear increments
|
|
-- it can only be altered by JMP, CALL or RET(R)
|
|
program_counter_q(pc_count_range_t) <=
|
|
program_counter_q(pc_count_range_t) + 1;
|
end if;
|
end if;
|
|
|
-- set pmem address
|
-- set pmem address
|
if write_pmem_addr_i then
|
if write_pmem_addr_i then
|
pmem_addr_q <= pmem_addr_s;
|
pmem_addr_q <= pmem_addr_s;
|
| Line 216... |
Line 224... |
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
-- File History:
|
-- File History:
|
--
|
--
|
-- $Log: not supported by cvs2svn $
|
-- $Log: not supported by cvs2svn $
|
|
-- Revision 1.3 2004/07/11 16:51:33 arniml
|
|
-- cleanup copyright notice
|
|
--
|
-- Revision 1.2 2004/04/24 23:44:25 arniml
|
-- Revision 1.2 2004/04/24 23:44:25 arniml
|
-- move from std_logic_arith to numeric_std
|
-- move from std_logic_arith to numeric_std
|
--
|
--
|
-- Revision 1.1 2004/03/23 21:31:53 arniml
|
-- Revision 1.1 2004/03/23 21:31:53 arniml
|
-- initial check-in
|
-- initial check-in
|
--
|
--
|
--
|
|
-------------------------------------------------------------------------------
|
-------------------------------------------------------------------------------
|
|
|
No newline at end of file
|
No newline at end of file
|
