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/*
* TOP2049 Open Source programming suite
*
* Atmel AT89C2051 DIP20
* FPGA bottomhalf implementation
*
* Copyright (c) 2010 Guido
* Copyright (c) 2010 Michael Buesch <mb@bu3sch.de>
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
module at89c2051dip20(data, ale, write, read, osc_in, zif);
inout [7:0] data;
input ale;
input write;
input read;
input osc_in; /* 12MHz oscillator */
inout [48:1] zif;
/* Interface to the microcontroller */
wire read_oe; /* Read output-enable */
reg [7:0] address; /* Cached address value */
reg [7:0] read_data; /* Cached read data */
wire low, high; /* Constant lo/hi */
/* Programmer context */
reg [1:0] prog_busy;
reg [3:0] prog_command;
reg [3:0] prog_state;
reg [3:0] prog_count;
reg prog_err;
/* DUT signals */
reg [7:0] dut_data;
reg dut_p33;
reg dut_p34;
reg dut_p35;
reg dut_p37;
reg dut_ia; /* Increment Address */
reg dut_prog;
reg dut_vpp;
assign low = 0;
assign high = 1;
initial begin
prog_busy <= 0;
prog_command <= 0;
prog_state <= 0;
prog_err <= 0;
prog_count <= 0;
dut_data <= 0;
dut_p33 <= 0;
dut_p34 <= 0;
dut_p35 <= 0;
dut_p37 <= 0;
dut_ia <= 0;
dut_prog <= 0;
dut_vpp <= 0;
end
/* The delay counter. Based on the 12MHz input clock. */
reg [15:0] delay_count;
wire osc;
IBUF osc_ibuf(.I(osc_in), .O(osc));
always @(posedge osc) begin
if (delay_count == 0) begin
if (prog_busy[0] != prog_busy[1]) begin
/* busy0 != busy1 indicates that a command is running.
* Continue executing it... */
case (prog_command)
1: begin /* Set P3.2 after init */
dut_prog <= 1;
prog_busy[1] <= prog_busy[0];
end
2: begin /* clear P3.2 before shutdown */
dut_prog <= 0;
prog_busy[1] <= prog_busy[0];
end
3: begin /* programm byte */
case (prog_state)
0: begin /* pulse */
delay_count <= 24;
dut_prog <= 0;
prog_state <= 1;
prog_err <= 0;
end
1: begin /* raise dut_prog */
dut_prog <= 1;
prog_state <= 2;
prog_count <= 12;
delay_count <= 2;
end
2: begin /* wait for ready == 1 */
if (zif[17] == 0) begin
delay_count <= 4800; /* each 200 us */
prog_count <= prog_count - 1;
if (prog_count == 0) begin
prog_err <= 1;
prog_state <= 3;
end
end
else begin
prog_state <= 3;
delay_count <= 24;
end
end
3: begin /* finish */
prog_state <= 0;
prog_busy[1] <= prog_busy[0];
end
endcase
end
4: begin /* chip erase */
case (prog_state)
0: begin /* start erasing */
delay_count <= 24000; /* 1 ms each */
prog_count <= 10;
dut_prog <= 0;
prog_state <= 1;
prog_err <= 0;
end
1: begin /* loop */
prog_count <= prog_count - 1;
if (prog_count == 0) begin
dut_prog <= 1;
prog_state <= 0;
prog_busy[1] <= prog_busy[0];
end
else begin
delay_count <= 24000;
end
end
endcase
end
5: begin /* set dut_vpp */
dut_vpp <= 1;
prog_busy[1] <= prog_busy[0];
end
6: begin /* clear dut_vpp */
dut_vpp <= 0;
prog_busy[1] <= prog_busy[0];
end
endcase
end
end else begin
delay_count <= delay_count - 1;
end
end
always @(posedge write) begin
case (address)
8'h10: begin
/* Data write */
dut_data <= data;
end
8'h12: begin
/* Run a command. */
prog_command <= data;
prog_busy[0] <= ~prog_busy[1];
end
8'h16: begin
/* Set P33, P34, P35; IA */
dut_p33 <= data[0];
dut_p34 <= data[1];
dut_p35 <= data[2];
dut_p37 <= data[2];
dut_ia <= data[3];
end
endcase
end
always @(negedge read) begin
case (address)
8'h10: begin
/* Data read */
read_data[7:0] <= zif[33:26];
end
8'h12: begin
/* Read status */
read_data[0] <= (prog_busy[0] != prog_busy[1]);
read_data[1] <= prog_err;
end
8'h16: begin
/* Raw ZIF pin read access */
read_data <= zif[8:1];
end
8'h17: begin
/* Raw ZIF pin read access */
read_data <= zif[16:9];
end
8'h18: begin
/* Raw ZIF pin read access */
read_data <= zif[24:17];
end
8'h19: begin
/* Raw ZIF pin read access */
read_data <= zif[32:25];
end
8'h1A: begin
/* Raw ZIF pin read access */
read_data <= zif[40:33];
end
8'h1B: begin
/* Raw ZIF pin read access */
read_data <= zif[48:41];
end
endcase
end
always @(negedge ale) begin
address <= data;
end
assign read_oe = !read && address[4];
bufif0(zif[1], low, low);
bufif0(zif[2], low, low);
bufif0(zif[3], low, low);
bufif0(zif[4], low, low);
bufif0(zif[5], low, low);
bufif0(zif[6], low, low);
bufif0(zif[7], low, low);
bufif0(zif[8], low, low);
bufif0(zif[9], low, low);
bufif0(zif[10], low, low);
bufif0(zif[11], low, low);
bufif0(zif[12], low, low);
bufif0(zif[13], low, low);
bufif0(zif[14], low, low);
bufif0(zif[15], low, dut_vpp); /* VPP/Reset */
bufif0(zif[16], low, low); /* P3.0 */
bufif0(zif[17], low, high); /* P3.1 */
bufif0(zif[18], low, low); /* XTAL2 */
bufif0(zif[19], dut_ia, low); /* XTAL1 */
bufif0(zif[20], dut_prog, low); /* P3.2 */
bufif0(zif[21], dut_p33, low); /* P3.3 */
bufif0(zif[22], dut_p34, low); /* P3.4 */
bufif0(zif[23], dut_p35, low); /* P3.5 */
bufif0(zif[24], low, low); /* GND */
bufif0(zif[25], dut_p37, low); /* P3.7 */
bufif0(zif[26], dut_data[0], !dut_p34); /* P1.0 */
bufif0(zif[27], dut_data[1], !dut_p34); /* P1.1 */
bufif0(zif[28], dut_data[2], !dut_p34); /* P1.2 */
bufif0(zif[29], dut_data[3], !dut_p34); /* P1.3 */
bufif0(zif[30], dut_data[4], !dut_p34); /* P1.4 */
bufif0(zif[31], dut_data[5], !dut_p34); /* P1.5 */
bufif0(zif[32], dut_data[6], !dut_p34); /* P1.6 */
bufif0(zif[33], dut_data[7], !dut_p34); /* P1.7 */
bufif0(zif[34], high, low); /* VCC */
bufif0(zif[35], low, low);
bufif0(zif[36], low, low);
bufif0(zif[37], low, low);
bufif0(zif[38], low, low);
bufif0(zif[39], low, low);
bufif0(zif[40], low, low);
bufif0(zif[41], low, low);
bufif0(zif[42], low, low);
bufif0(zif[43], low, low);
bufif0(zif[44], low, low);
bufif0(zif[45], low, low);
bufif0(zif[46], low, low);
bufif0(zif[47], low, low);
bufif0(zif[48], low, low);
bufif1(data[0], read_data[0], read_oe);
bufif1(data[1], read_data[1], read_oe);
bufif1(data[2], read_data[2], read_oe);
bufif1(data[3], read_data[3], read_oe);
bufif1(data[4], read_data[4], read_oe);
bufif1(data[5], read_data[5], read_oe);
bufif1(data[6], read_data[6], read_oe);
bufif1(data[7], read_data[7], read_oe);
endmodule
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