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/*
* TOP2049 Open Source programming suite
*
* Atmel Tiny13 DIP8
* FPGA bottomhalf implementation
*
* 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 attiny13dip8(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 */
/* Programmer context */
reg [1:0] prog_busy;
reg [7:0] prog_command;
reg [7:0] prog_state;
reg [7:0] prog_count;
`define CMD_SENDINSTR 1
reg dut_sdi;
reg dut_sii;
reg dut_sci_manual;
reg dut_sci_auto;
wire dut_sci;
reg dut_sdo_driven;
reg dut_sdo_value;
reg dut_rst_driven;
reg dut_rst_value;
`define DUT_SDO 33
reg [10:0] sdi_buf;
reg [10:0] sii_buf;
reg [10:0] sdo_buf;
wire low, high; /* Constant lo/hi */
assign low = 0;
assign high = 1;
initial begin
prog_busy <= 0;
prog_command <= 0;
prog_state <= 0;
prog_count <= 0;
dut_sdi <= 0;
dut_sii <= 0;
dut_sci_manual <= 0;
dut_sci_auto <= 0;
dut_sdo_driven <= 0;
dut_sdo_value <= 0;
dut_rst_driven <= 0;
dut_rst_value <= 0;
sdi_buf <= 0;
sii_buf <= 0;
sdo_buf <= 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 && prog_busy[0] != prog_busy[1]) begin
case (prog_command)
`CMD_SENDINSTR: begin
case (prog_state)
0: begin
dut_sdi <= sdi_buf[10 - prog_count];
dut_sii <= sii_buf[10 - prog_count];
prog_state <= 1;
delay_count <= 3 - 1; /* 100ns */
end
1: begin
dut_sci_auto <= 1; /* CLK hi */
prog_state <= 2;
delay_count <= 3 - 1; /* 100ns */
end
2: begin
sdo_buf[10 - prog_count] <= zif[`DUT_SDO];
prog_count <= prog_count + 1;
prog_state <= 3;
delay_count <= 3 - 1; /* 100ns */
end
3: begin
dut_sci_auto <= 0; /* CLK lo */
delay_count <= 4 - 1; /* 150ns */
if (prog_count == 11) begin
prog_state <= 0;
prog_count <= 0;
prog_busy[1] <= prog_busy[0]; /* done */
end else begin
prog_state <= 0;
end
end
endcase
end
endcase
end else begin
delay_count <= delay_count - 1;
end
end
always @(posedge write) begin
case (address)
8'h10: begin /* Unused */
end
8'h12: begin /* Run command */
prog_command <= data;
prog_busy[0] <= ~prog_busy[1];
end
8'h13: begin /* Load SDI sequence */
sdi_buf[1:0] <= 0;
sdi_buf[9:2] <= data;
sdi_buf[10] <= 0;
end
8'h14: begin /* Load SII sequence */
sii_buf[1:0] <= 0;
sii_buf[9:2] <= data;
sii_buf[10] <= 0;
end
8'h15: begin /* Set signals manually */
dut_sci_manual <= data[0]; /* SCI */
dut_sdo_driven <= data[1]; /* SDO drive-enable */
dut_sdo_value <= data[2]; /* SDO drive-value */
dut_rst_driven <= data[3]; /* RESET drive-enable */
dut_rst_value <= data[4]; /* RESET drive-value */
end
endcase
end
always @(negedge read) begin
case (address)
8'h10: begin /* Get SDO sequence high (bits 3-10) */
read_data[7:0] <= sdo_buf[10:3];
end
8'h12: begin /* Read status */
read_data[0] <= (prog_busy[0] != prog_busy[1]); /* busy */
read_data[1] <= zif[`DUT_SDO]; /* Raw SDO pin access */
end
8'h13: begin /* Get SDO sequence low (bits 0-7) */
read_data[7:0] <= sdo_buf[7:0];
end
endcase
end
always @(negedge ale) begin
address <= data;
end
assign dut_sci = (prog_busy[0] == prog_busy[1]) ? dut_sci_manual : dut_sci_auto;
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], dut_rst_value, !dut_rst_driven); /* RESET */
bufif0(zif[16], dut_sci, low); /* SCI */
bufif0(zif[17], low, high); /* PB4 */
bufif0(zif[18], low, low); /* GND */
bufif0(zif[19], low, low);
bufif0(zif[20], low, low);
bufif0(zif[21], low, low);
bufif0(zif[22], low, low);
bufif0(zif[23], low, low);
bufif0(zif[24], low, low);
bufif0(zif[25], low, low);
bufif0(zif[26], low, low);
bufif0(zif[27], low, low);
bufif0(zif[28], low, low);
bufif0(zif[29], low, low);
bufif0(zif[30], low, low);
bufif0(zif[31], dut_sdi, low); /* SDI */
bufif0(zif[32], dut_sii, low); /* SII */
bufif0(zif[33], dut_sdo_value, !dut_sdo_driven); /* SDO */
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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