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--See wrimm subversion project for version history
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--See wrimm subversion project for version history
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library ieee;
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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use ieee.numeric_std.all;
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library wrimm;
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use wrimm.WrimmPackage.all;
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use work.WrimmPackage.all;
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entity Wrimm is
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entity Wrimm is
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--generic (
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-- MasterParams : WbMasterDefType;
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-- SlaveParams : WbSlaveDefType;
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-- StatusParams : StatusFieldDefType;
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-- SettingParams : SettingFieldDefType;
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-- TriggerParams : TriggerFieldDefType);
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port (
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port (
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WbClk : in std_logic;
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WbClk : in std_logic;
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WbRst : out std_logic;
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WbRst : out std_logic;
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WbMasterIn : in WbMasterOutArray; --Signals from Masters
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WbMasterIn : in WbMasterOutArray; --Signals from Masters
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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procArb: process(WbClk,rstZ) is --Round robin arbitration (descending)
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procArb: process(WbClk,rstZ) is --Round robin arbitration (descending)
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variable vGrant : WbMasterGrantType;
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variable vGrant : WbMasterGrantType;
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begin
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begin
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if (rstZ='0') then
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if (rstZ='0') then
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vGrant(vGrant'range) := (Others=>'0');
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vGrant := (Others=>'0');
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vGrant(vGrant'left) := '1';
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vGrant(vGrant'left) := '1';
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elsif rising_edge(WbClk) then
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elsif rising_edge(WbClk) then
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loopGrant: for i in WbMasterType loop
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loopGrant: for i in WbMasterType loop
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if vGrant(i)='1' and WbMasterIn(i).Cyc='0' then --else maintain grant
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if vGrant(i)='1' and WbMasterIn(i).Cyc='0' then --else maintain grant
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loopNewGrantA: for j in i to WbMasterType'right loop --last master with cyc=1 will be selected
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loopNewGrantA: for j in i to WbMasterType'right loop --last master with cyc=1 will be selected
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end if;
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end if;
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end loop loopNewGrantB; --grant only moves after new requester
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end loop loopNewGrantB; --grant only moves after new requester
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end if;
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end if;
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end if;
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end if;
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end loop loopGrant;
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end loop loopGrant;
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grant <= vGrant;
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end if; --Clk
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end if; --Clk
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grant <= vGrant;
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end process procArb;
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end process procArb;
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--=============================================================================
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--=============================================================================
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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-- Master Multiplexers
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-- Master Multiplexers
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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