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wfjm.w11/rtl/ibus/ib_intmap24.vhd
wfjm d3cce101a7 SPDX: rtl/*/*.vhd
2019-07-12 19:01:49 +02:00

173 lines
6.8 KiB
VHDL
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-- $Id: ib_intmap24.vhd 1181 2019-07-08 17:00:50Z mueller $
-- SPDX-License-Identifier: GPL-3.0-or-later
-- Copyright 2017-2019 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
--
------------------------------------------------------------------------------
-- Module Name: ib_intmap24 - syn
-- Description: pdp11: external interrupt mapper (23 line)
--
-- Dependencies: -
-- Test bench: tb/tb_pdp11_core (implicit)
-- Target Devices: generic
-- Tool versions: ise 14.7; viv 2016.4-2017.2; ghdl 0.33-0.35
--
-- Synthesized:
-- Date Rev viv Target flop lutl lutm bram slic MHz
-- 2016-05-26 641 2016.4 xc7a100t-1 0 48 0 0 - -
-- 2015-02-22 641 i 14.7 xc6slx16-2 0 38 0 0 20 -
--
-- Revision History:
-- Date Rev Version Comment
-- 2019-04-23 1136 1.1 BUGFIX: ensure ACK send to correct device
-- 2017-01-28 846 1.0 Initial version (cloned from ib_intmap.vhd)
------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.slvtypes.all;
use work.iblib.all;
-- ----------------------------------------------------------------------------
entity ib_intmap24 is -- external interrupt mapper (23 line)
generic (
INTMAP : intmap24_array_type := intmap24_array_init);
port (
CLK : in slbit; -- clock
EI_REQ : in slv24_1; -- interrupt request lines
EI_ACKM : in slbit; -- interrupt acknowledge (from master)
EI_ACK : out slv24_1; -- interrupt acknowledge (to requestor)
EI_PRI : out slv3; -- interrupt priority
EI_VECT : out slv9_2 -- interrupt vector
);
end ib_intmap24;
architecture syn of ib_intmap24 is
signal EI_LINE : slv5 := (others=>'0'); -- external interrupt line
signal R_LINE : slv5 := (others=>'0'); -- line on last cycle
type intp_type is array (23 downto 0) of slv3;
type intv_type is array (23 downto 0) of slv9;
constant conf_intp : intp_type :=
(slv(to_unsigned(INTMAP(23).pri,3)), -- line 23
slv(to_unsigned(INTMAP(22).pri,3)), -- line 22
slv(to_unsigned(INTMAP(21).pri,3)), -- line 21
slv(to_unsigned(INTMAP(20).pri,3)), -- line 20
slv(to_unsigned(INTMAP(19).pri,3)), -- line 19
slv(to_unsigned(INTMAP(18).pri,3)), -- line 18
slv(to_unsigned(INTMAP(17).pri,3)), -- line 17
slv(to_unsigned(INTMAP(16).pri,3)), -- line 16
slv(to_unsigned(INTMAP(15).pri,3)), -- line 15
slv(to_unsigned(INTMAP(14).pri,3)), -- line 14
slv(to_unsigned(INTMAP(13).pri,3)), -- line 13
slv(to_unsigned(INTMAP(12).pri,3)), -- line 12
slv(to_unsigned(INTMAP(11).pri,3)), -- line 11
slv(to_unsigned(INTMAP(10).pri,3)), -- line 10
slv(to_unsigned(INTMAP( 9).pri,3)), -- line 9
slv(to_unsigned(INTMAP( 8).pri,3)), -- line 8
slv(to_unsigned(INTMAP( 7).pri,3)), -- line 7
slv(to_unsigned(INTMAP( 6).pri,3)), -- line 6
slv(to_unsigned(INTMAP( 5).pri,3)), -- line 5
slv(to_unsigned(INTMAP( 4).pri,3)), -- line 4
slv(to_unsigned(INTMAP( 3).pri,3)), -- line 3
slv(to_unsigned(INTMAP( 2).pri,3)), -- line 2
slv(to_unsigned(INTMAP( 1).pri,3)), -- line 1
slv(to_unsigned( 0,3)) -- line 0 (always 0 !!)
);
constant conf_intv : intv_type :=
(
slv(to_unsigned(INTMAP(23).vec,9)), -- line 23
slv(to_unsigned(INTMAP(22).vec,9)), -- line 22
slv(to_unsigned(INTMAP(21).vec,9)), -- line 21
slv(to_unsigned(INTMAP(20).vec,9)), -- line 20
slv(to_unsigned(INTMAP(19).vec,9)), -- line 19
slv(to_unsigned(INTMAP(18).vec,9)), -- line 18
slv(to_unsigned(INTMAP(17).vec,9)), -- line 17
slv(to_unsigned(INTMAP(16).vec,9)), -- line 16
slv(to_unsigned(INTMAP(15).vec,9)), -- line 15
slv(to_unsigned(INTMAP(14).vec,9)), -- line 14
slv(to_unsigned(INTMAP(13).vec,9)), -- line 13
slv(to_unsigned(INTMAP(12).vec,9)), -- line 12
slv(to_unsigned(INTMAP(11).vec,9)), -- line 11
slv(to_unsigned(INTMAP(10).vec,9)), -- line 10
slv(to_unsigned(INTMAP( 9).vec,9)), -- line 9
slv(to_unsigned(INTMAP( 8).vec,9)), -- line 8
slv(to_unsigned(INTMAP( 7).vec,9)), -- line 7
slv(to_unsigned(INTMAP( 6).vec,9)), -- line 6
slv(to_unsigned(INTMAP( 5).vec,9)), -- line 5
slv(to_unsigned(INTMAP( 4).vec,9)), -- line 4
slv(to_unsigned(INTMAP( 3).vec,9)), -- line 3
slv(to_unsigned(INTMAP( 2).vec,9)), -- line 2
slv(to_unsigned(INTMAP( 1).vec,9)), -- line 1
slv(to_unsigned( 0,9)) -- line 0 (always 0 !!)
);
-- attribute PRIORITY_EXTRACT : string;
-- attribute PRIORITY_EXTRACT of EI_LINE : signal is "force";
begin
EI_LINE <= "10111" when EI_REQ(23)='1' else
"10110" when EI_REQ(22)='1' else
"10101" when EI_REQ(21)='1' else
"10100" when EI_REQ(20)='1' else
"10011" when EI_REQ(19)='1' else
"10010" when EI_REQ(18)='1' else
"10001" when EI_REQ(17)='1' else
"10000" when EI_REQ(16)='1' else
"01111" when EI_REQ(15)='1' else
"01110" when EI_REQ(14)='1' else
"01101" when EI_REQ(13)='1' else
"01100" when EI_REQ(12)='1' else
"01011" when EI_REQ(11)='1' else
"01010" when EI_REQ(10)='1' else
"01001" when EI_REQ( 9)='1' else
"01000" when EI_REQ( 8)='1' else
"00111" when EI_REQ( 7)='1' else
"00110" when EI_REQ( 6)='1' else
"00101" when EI_REQ( 5)='1' else
"00100" when EI_REQ( 4)='1' else
"00011" when EI_REQ( 3)='1' else
"00010" when EI_REQ( 2)='1' else
"00001" when EI_REQ( 1)='1' else
"00000";
proc_line: process (CLK)
begin
if rising_edge(CLK) then
R_LINE <= EI_LINE;
end if;
end process proc_line;
-- Note: EI_ACKM comes one cycle after vector is latched ! Therefore
-- - use EI_LINE to select vector to send to EI_PRI and EI_VECT
-- - use R_LINE to select EI_ACM line for acknowledge
proc_intmap : process (EI_LINE, EI_ACKM, R_LINE)
variable ilinecur : integer := 0;
variable ilinelst : integer := 0;
variable iei_ack : slv24 := (others=>'0');
begin
ilinecur := to_integer(unsigned(EI_LINE));
ilinelst := to_integer(unsigned(R_LINE));
-- send info of currently highest priority request
EI_PRI <= conf_intp(ilinecur);
EI_VECT <= conf_intv(ilinecur)(8 downto 2);
-- route acknowledge back to winner line of last cycle
iei_ack := (others=>'0');
if EI_ACKM = '1' then
iei_ack(ilinelst) := '1';
end if;
EI_ACK <= iei_ack(EI_ACK'range);
end process proc_intmap;
end syn;
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