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/trunk/rtl/verilog/eth_cop.v
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//////////////////////////////////////////////////////////////////////
//// ////
//// eth_cop.v ////
//// ////
//// This file is part of the Ethernet IP core project ////
//// http://www.opencores.org/projects/ethmac/ ////
//// ////
//// Author(s): ////
//// - Igor Mohor (igorM@opencores.org) ////
//// ////
//// All additional information is avaliable in the Readme.txt ////
//// file. ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2001, 2002 Authors ////
//// ////
//// This source file may be used and distributed without ////
//// restriction provided that this copyright statement is not ////
//// removed from the file and that any derivative work contains ////
//// the original copyright notice and the associated disclaimer. ////
//// ////
//// This source file is free software; you can redistribute it ////
//// and/or modify it under the terms of the GNU Lesser General ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any ////
//// later version. ////
//// ////
//// This source is distributed in the hope that it will be ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
//// PURPOSE. See the GNU Lesser General Public License for more ////
//// details. ////
//// ////
//// You should have received a copy of the GNU Lesser General ////
//// Public License along with this source; if not, download it ////
//// from http://www.opencores.org/lgpl.shtml ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
//
//
//
//
 
`include "tb_eth_defines.v"
`include "timescale.v"
 
module eth_cop
(
// WISHBONE common
wb_clk_i, wb_rst_i,
// WISHBONE MASTER 1
m1_wb_adr_i, m1_wb_sel_i, m1_wb_we_i, m1_wb_dat_o,
m1_wb_dat_i, m1_wb_cyc_i, m1_wb_stb_i, m1_wb_ack_o,
m1_wb_err_o,
 
// WISHBONE MASTER 2
m2_wb_adr_i, m2_wb_sel_i, m2_wb_we_i, m2_wb_dat_o,
m2_wb_dat_i, m2_wb_cyc_i, m2_wb_stb_i, m2_wb_ack_o,
m2_wb_err_o,
 
// WISHBONE slave 1
s1_wb_adr_o, s1_wb_sel_o, s1_wb_we_o, s1_wb_cyc_o,
s1_wb_stb_o, s1_wb_ack_i, s1_wb_err_i, s1_wb_dat_i,
s1_wb_dat_o,
// WISHBONE slave 2
s2_wb_adr_o, s2_wb_sel_o, s2_wb_we_o, s2_wb_cyc_o,
s2_wb_stb_o, s2_wb_ack_i, s2_wb_err_i, s2_wb_dat_i,
s2_wb_dat_o
);
 
parameter Tp=1;
 
// WISHBONE common
input wb_clk_i, wb_rst_i;
// WISHBONE MASTER 1
input [31:0] m1_wb_adr_i, m1_wb_dat_i;
input [3:0] m1_wb_sel_i;
input m1_wb_cyc_i, m1_wb_stb_i, m1_wb_we_i;
output [31:0] m1_wb_dat_o;
output m1_wb_ack_o, m1_wb_err_o;
 
// WISHBONE MASTER 2
input [31:0] m2_wb_adr_i, m2_wb_dat_i;
input [3:0] m2_wb_sel_i;
input m2_wb_cyc_i, m2_wb_stb_i, m2_wb_we_i;
output [31:0] m2_wb_dat_o;
output m2_wb_ack_o, m2_wb_err_o;
 
// WISHBONE slave 1
input [31:0] s1_wb_dat_i;
input s1_wb_ack_i, s1_wb_err_i;
output [31:0] s1_wb_adr_o, s1_wb_dat_o;
output [3:0] s1_wb_sel_o;
output s1_wb_we_o, s1_wb_cyc_o, s1_wb_stb_o;
// WISHBONE slave 2
input [31:0] s2_wb_dat_i;
input s2_wb_ack_i, s2_wb_err_i;
output [31:0] s2_wb_adr_o, s2_wb_dat_o;
output [3:0] s2_wb_sel_o;
output s2_wb_we_o, s2_wb_cyc_o, s2_wb_stb_o;
 
reg m1_in_progress;
reg m2_in_progress;
reg [31:0] s1_wb_adr_o;
reg [3:0] s1_wb_sel_o;
reg s1_wb_we_o;
reg [31:0] s1_wb_dat_o;
reg s1_wb_cyc_o;
reg s1_wb_stb_o;
reg [31:0] s2_wb_adr_o;
reg [3:0] s2_wb_sel_o;
reg s2_wb_we_o;
reg [31:0] s2_wb_dat_o;
reg s2_wb_cyc_o;
reg s2_wb_stb_o;
 
reg m1_wb_ack_o;
reg [31:0] m1_wb_dat_o;
reg m2_wb_ack_o;
reg [31:0] m2_wb_dat_o;
 
reg m1_wb_err_o;
reg m2_wb_err_o;
 
wire m_wb_access_finished;
wire m1_req = m1_wb_cyc_i & m1_wb_stb_i & (`M1_ADDRESSED_S1 | `M1_ADDRESSED_S2);
wire m2_req = m2_wb_cyc_i & m2_wb_stb_i & (`M2_ADDRESSED_S1 | `M2_ADDRESSED_S2);
 
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
if(wb_rst_i)
begin
m1_in_progress <=#Tp 0;
m2_in_progress <=#Tp 0;
s1_wb_adr_o <=#Tp 0;
s1_wb_sel_o <=#Tp 0;
s1_wb_we_o <=#Tp 0;
s1_wb_dat_o <=#Tp 0;
s1_wb_cyc_o <=#Tp 0;
s1_wb_stb_o <=#Tp 0;
s2_wb_adr_o <=#Tp 0;
s2_wb_sel_o <=#Tp 0;
s2_wb_we_o <=#Tp 0;
s2_wb_dat_o <=#Tp 0;
s2_wb_cyc_o <=#Tp 0;
s2_wb_stb_o <=#Tp 0;
end
else
begin
case({m1_in_progress, m2_in_progress, m1_req, m2_req, m_wb_access_finished}) // synopsys_full_case synopsys_paralel_case
5'b00_10_0, 5'b00_11_0 :
begin
m1_in_progress <=#Tp 1'b1; // idle: m1 or (m1 & m2) want access: m1 -> m
if(`M1_ADDRESSED_S1)
begin
s1_wb_adr_o <=#Tp m1_wb_adr_i;
s1_wb_sel_o <=#Tp m1_wb_sel_i;
s1_wb_we_o <=#Tp m1_wb_we_i;
s1_wb_dat_o <=#Tp m1_wb_dat_i;
s1_wb_cyc_o <=#Tp 1'b1;
s1_wb_stb_o <=#Tp 1'b1;
end
else if(`M1_ADDRESSED_S2)
begin
s2_wb_adr_o <=#Tp m1_wb_adr_i;
s2_wb_sel_o <=#Tp m1_wb_sel_i;
s2_wb_we_o <=#Tp m1_wb_we_i;
s2_wb_dat_o <=#Tp m1_wb_dat_i;
s2_wb_cyc_o <=#Tp 1'b1;
s2_wb_stb_o <=#Tp 1'b1;
end
else
$display("(%t)(%m)WISHBONE ERROR: Unspecified address space accessed", $time);
end
5'b00_01_0 :
begin
m2_in_progress <=#Tp 1'b1; // idle: m2 wants access: m2 -> m
if(`M2_ADDRESSED_S1)
begin
s1_wb_adr_o <=#Tp m2_wb_adr_i;
s1_wb_sel_o <=#Tp m2_wb_sel_i;
s1_wb_we_o <=#Tp m2_wb_we_i;
s1_wb_dat_o <=#Tp m2_wb_dat_i;
s1_wb_cyc_o <=#Tp 1'b1;
s1_wb_stb_o <=#Tp 1'b1;
end
else if(`M2_ADDRESSED_S2)
begin
s2_wb_adr_o <=#Tp m2_wb_adr_i;
s2_wb_sel_o <=#Tp m2_wb_sel_i;
s2_wb_we_o <=#Tp m2_wb_we_i;
s2_wb_dat_o <=#Tp m2_wb_dat_i;
s2_wb_cyc_o <=#Tp 1'b1;
s2_wb_stb_o <=#Tp 1'b1;
end
else
$display("(%t)(%m)WISHBONE ERROR: Unspecified address space accessed", $time);
end
5'b10_10_1, 5'b10_11_1 :
begin
m1_in_progress <=#Tp 1'b0; // m1 in progress. Cycle is finished. Send ack or err to m1.
if(`M1_ADDRESSED_S1)
begin
s1_wb_cyc_o <=#Tp 1'b0;
s1_wb_stb_o <=#Tp 1'b0;
end
else if(`M1_ADDRESSED_S2)
begin
s2_wb_cyc_o <=#Tp 1'b0;
s2_wb_stb_o <=#Tp 1'b0;
end
end
5'b01_01_1, 5'b01_11_1 :
begin
m2_in_progress <=#Tp 1'b0; // m2 in progress. Cycle is finished. Send ack or err to m2.
if(`M2_ADDRESSED_S1)
begin
s1_wb_cyc_o <=#Tp 1'b0;
s1_wb_stb_o <=#Tp 1'b0;
end
else if(`M2_ADDRESSED_S2)
begin
s2_wb_cyc_o <=#Tp 1'b0;
s2_wb_stb_o <=#Tp 1'b0;
end
end
endcase
end
end
 
// Generating Ack for master 1
always @ (m1_in_progress or m1_wb_adr_i or s1_wb_ack_i or s2_wb_ack_i or s1_wb_dat_i or s2_wb_dat_i or `M1_ADDRESSED_S1 or `M1_ADDRESSED_S2)
begin
if(m1_in_progress)
begin
if(`M1_ADDRESSED_S1) begin
m1_wb_ack_o <= s1_wb_ack_i;
m1_wb_dat_o <= s1_wb_dat_i;
end
else if(`M1_ADDRESSED_S2) begin
m1_wb_ack_o <= s2_wb_ack_i;
m1_wb_dat_o <= s2_wb_dat_i;
end
end
else
m1_wb_ack_o <= 0;
end
 
 
// Generating Ack for master 2
always @ (m2_in_progress or m2_wb_adr_i or s1_wb_ack_i or s2_wb_ack_i or s1_wb_dat_i or s2_wb_dat_i or `M2_ADDRESSED_S1 or `M2_ADDRESSED_S2)
begin
if(m2_in_progress)
begin
if(`M2_ADDRESSED_S1) begin
m2_wb_ack_o <= s1_wb_ack_i;
m2_wb_dat_o <= s1_wb_dat_i;
end
else if(`M2_ADDRESSED_S2) begin
m2_wb_ack_o <= s2_wb_ack_i;
m2_wb_dat_o <= s2_wb_dat_i;
end
end
else
m2_wb_ack_o <= 0;
end
 
 
// Generating Err for master 1
always @ (m1_in_progress or m1_wb_adr_i or s1_wb_err_i or s2_wb_err_i or `M2_ADDRESSED_S1 or `M2_ADDRESSED_S2 or
m1_wb_cyc_i or m1_wb_stb_i)
begin
if(m1_in_progress) begin
if(`M1_ADDRESSED_S1)
m1_wb_err_o <= s1_wb_err_i;
else if(`M1_ADDRESSED_S2)
m1_wb_err_o <= s2_wb_err_i;
end
else if(m1_wb_cyc_i & m1_wb_stb_i & ~`M1_ADDRESSED_S1 & ~`M1_ADDRESSED_S2)
m1_wb_err_o <= 1'b1;
else
m1_wb_err_o <= 1'b0;
end
 
 
// Generating Err for master 2
always @ (m2_in_progress or m2_wb_adr_i or s1_wb_err_i or s2_wb_err_i or `M2_ADDRESSED_S1 or `M2_ADDRESSED_S2 or
m2_wb_cyc_i or m2_wb_stb_i)
begin
if(m2_in_progress) begin
if(`M2_ADDRESSED_S1)
m2_wb_err_o <= s1_wb_err_i;
else if(`M2_ADDRESSED_S2)
m2_wb_err_o <= s2_wb_err_i;
end
else if(m2_wb_cyc_i & m2_wb_stb_i & ~`M2_ADDRESSED_S1 & ~`M2_ADDRESSED_S2)
m2_wb_err_o <= 1'b1;
else
m2_wb_err_o <= 1'b0;
end
 
 
assign m_wb_access_finished = m1_wb_ack_o | m1_wb_err_o | m2_wb_ack_o | m2_wb_err_o;
 
 
// Activity monitor
integer cnt;
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
if(wb_rst_i)
cnt <=#Tp 0;
else
if(s1_wb_ack_i | s1_wb_err_i | s2_wb_ack_i | s2_wb_err_i)
cnt <=#Tp 0;
else
if(s1_wb_cyc_o | s2_wb_cyc_o)
cnt <=#Tp cnt+1;
end
 
always @ (posedge wb_clk_i)
begin
if(cnt==1000) begin
$display("(%0t) ERROR: WB activity ??? ", $time);
if(s1_wb_cyc_o) begin
$display("s1_wb_dat_o = 0x%0x", s1_wb_dat_o);
$display("s1_wb_adr_o = 0x%0x", s1_wb_adr_o);
$display("s1_wb_sel_o = 0x%0x", s1_wb_sel_o);
$display("s1_wb_we_o = 0x%0x", s1_wb_we_o);
end
else if(s1_wb_cyc_o) begin
$display("s2_wb_dat_o = 0x%0x", s2_wb_dat_o);
$display("s2_wb_adr_o = 0x%0x", s2_wb_adr_o);
$display("s2_wb_sel_o = 0x%0x", s2_wb_sel_o);
$display("s2_wb_we_o = 0x%0x", s2_wb_we_o);
end
 
$stop;
end
end
 
 
 
endmodule

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