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//
// Copyright 2011 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
`timescale 1ps/1ps
module gpmc_model_async
(output EM_CLK, inout [15:0] EM_D, output reg [10:1] EM_A, output reg [1:0] EM_NBE,
output reg EM_WAIT0, output reg EM_NCS4, output reg EM_NCS6,
output reg EM_NWE, output reg EM_NOE );
assign EM_CLK = 0;
reg [15:0] EM_D_int;
assign EM_D = EM_D_int;
initial
begin
EM_A <= 10'bz;
EM_NBE <= 2'b11;
EM_NWE <= 1;
EM_NOE <= 1;
EM_NCS4 <= 1;
EM_NCS6 <= 1;
EM_D_int <= 16'bz;
EM_WAIT0 <= 0; // FIXME this is actually an input
end
task GPMC_Write;
input ctrl;
input [10:0] addr;
input [15:0] data;
begin
#23000;
EM_A <= addr[10:1];
EM_D_int <= data;
#20100;
if(ctrl)
EM_NCS6 <= 0;
else
EM_NCS4 <= 0;
#14000;
EM_NWE <= 0;
#77500;
EM_NCS4 <= 1;
EM_NCS6 <= 1;
//#1.5;
EM_NWE <= 1;
#60000;
EM_A <= 10'bz;
EM_D_int <= 16'bz;
end
endtask // GPMC_Write
task GPMC_Read;
input ctrl;
input [10:0] addr;
begin
#13000;
EM_A <= addr[10:1];
#3000;
if(ctrl)
EM_NCS6 <= 0;
else
EM_NCS4 <= 0;
#14000;
EM_NOE <= 0;
#77500;
EM_NCS4 <= 1;
EM_NCS6 <= 1;
//#1.5;
$display("Data Read from GPMC: %X",EM_D);
EM_NOE <= 1;
#254000;
EM_A <= 10'bz;
end
endtask // GPMC_Read
initial
begin
#1000000;
GPMC_Write(1,36,16'hF00D);
#1000000;
GPMC_Read(1,36);
#1000000;
GPMC_Write(0,0,16'h1234);
GPMC_Write(0,0,16'h5678);
GPMC_Write(0,0,16'h9abc);
GPMC_Write(0,0,16'hF00D);
GPMC_Write(0,0,16'hDEAD);
GPMC_Write(0,0,16'hDEAD);
GPMC_Write(0,0,16'hDEAD);
GPMC_Write(0,0,16'hDEAD);
GPMC_Write(0,0,16'hDEAD);
GPMC_Write(0,0,16'hDEAD);
#1000000;
GPMC_Write(0,0,16'h1234);
GPMC_Write(0,0,16'h5678);
GPMC_Write(0,0,16'h9abc);
GPMC_Write(0,0,16'hF00D);
GPMC_Write(0,0,16'hDEAD);
GPMC_Write(0,0,16'hDEAD);
GPMC_Write(0,0,16'hDEAD);
GPMC_Write(0,0,16'hDEAD);
GPMC_Write(0,0,16'hDEAD);
GPMC_Write(0,0,16'h9876);
#1000000;
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
#1000000;
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
GPMC_Read(0,0);
#1000000;
GPMC_Read(0,0);
#100000000;
$finish;
end
endmodule // gpmc_model_async
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