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Diffstat (limited to 'zpu/hdl/wishbone/zpu_wb_bridge.vhd')
-rw-r--r-- | zpu/hdl/wishbone/zpu_wb_bridge.vhd | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/zpu/hdl/wishbone/zpu_wb_bridge.vhd b/zpu/hdl/wishbone/zpu_wb_bridge.vhd new file mode 100644 index 0000000..086ae11 --- /dev/null +++ b/zpu/hdl/wishbone/zpu_wb_bridge.vhd @@ -0,0 +1,83 @@ +-- ZPU +-- +-- Copyright 2004-2008 oharboe - Øyvind Harboe - oyvind.harboe@zylin.com +-- +-- The FreeBSD license +-- +-- Redistribution and use in source and binary forms, with or without +-- modification, are permitted provided that the following conditions +-- are met: +-- +-- 1. Redistributions of source code must retain the above copyright +-- notice, this list of conditions and the following disclaimer. +-- 2. Redistributions in binary form must reproduce the above +-- copyright notice, this list of conditions and the following +-- disclaimer in the documentation and/or other materials +-- provided with the distribution. +-- +-- THIS SOFTWARE IS PROVIDED BY THE ZPU PROJECT ``AS IS'' AND ANY +-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +-- ZPU PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, +-- INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +-- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF +-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +-- +-- The views and conclusions contained in the software and documentation +-- are those of the authors and should not be interpreted as representing +-- official policies, either expressed or implied, of the ZPU Project. + +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.STD_LOGIC_UNSIGNED.ALL; + +library work; +use work.phi_config.all; +use work.wishbone_pkg.all; +use work.zpupkg.all; +use work.zpu_config.all; + +entity zpu_wb_bridge is + port ( -- Native ZPU interface + clk : in std_logic; + areset : in std_logic; + + mem_req : in std_logic; + mem_we : in std_logic; + mem_ack : out std_logic; + mem_read : out std_logic_vector(wordSize-1 downto 0); + mem_write : in std_logic_vector(wordSize-1 downto 0); + out_mem_addr : in std_logic_vector(maxAddrBitIncIO downto 0); + mem_writeMask : in std_logic_vector(wordBytes-1 downto 0); + + -- Wishbone from ZPU + zpu_wb_i : in wishbone_bus_out; + zpu_wb_o : out wishbone_bus_in); + +end zpu_wb_bridge; + +architecture behave of zpu_wb_bridge is + +begin + + mem_read <= zpu_wb_i.dat; + mem_ack <= zpu_wb_i.ack; + + zpu_wb_o.adr <= "000000" & out_mem_addr(27) & out_mem_addr(24 downto 0); + zpu_wb_o.dat <= mem_write; + zpu_wb_o.sel <= mem_writeMask; + zpu_wb_o.stb <= mem_req; + zpu_wb_o.cyc <= mem_req; + zpu_wb_o.we <= mem_we; + +end behave; + + + + + |