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This repository is simply a mirror of the file fpga/hdmi_overlay_0xD_src.tgz downloaded from http://www.kosagi.com/netv_hardware/ on Jan 19th, 2011. It seems to contain all the verilog and scripts required to build FPGA firmware for the NeTV HDMI device from Chumby/Sutajio Ko-Usagi; see http://www.kosagi.com/blog/ for more information. Licensing is vague; see ip/license.txt
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// | ||
// Module: DRAM16XN | ||
// | ||
// Description: Distributed SelectRAM example | ||
// Dual Port 16 x N-bit | ||
// | ||
// Device: Spartan-3 Family | ||
//--------------------------------------------------------------------------------------- | ||
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module DRAM16XN #(parameter data_width = 20) | ||
( | ||
DATA_IN, | ||
ADDRESS, | ||
ADDRESS_DP, | ||
WRITE_EN, | ||
CLK, | ||
O_DATA_OUT, | ||
O_DATA_OUT_DP); | ||
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input [data_width-1:0]DATA_IN; | ||
input [3:0] ADDRESS; | ||
input [3:0] ADDRESS_DP; | ||
input WRITE_EN; | ||
input CLK; | ||
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output [data_width-1:0]O_DATA_OUT_DP; | ||
output [data_width-1:0]O_DATA_OUT; | ||
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genvar i; | ||
generate | ||
for(i = 0 ; i < data_width ; i = i + 1) begin : dram16s | ||
RAM16X1D i_RAM16X1D_U( | ||
.D(DATA_IN[i]), //insert input signal | ||
.WE(WRITE_EN), //insert Write Enable signal | ||
.WCLK(CLK), //insert Write Clock signal | ||
.A0(ADDRESS[0]), //insert Address 0 signal port SPO | ||
.A1(ADDRESS[1]), //insert Address 1 signal port SPO | ||
.A2(ADDRESS[2]), //insert Address 2 signal port SPO | ||
.A3(ADDRESS[3]), //insert Address 3 signal port SPO | ||
.DPRA0(ADDRESS_DP[0]), //insert Address 0 signal dual port DPO | ||
.DPRA1(ADDRESS_DP[1]), //insert Address 1 signal dual port DPO | ||
.DPRA2(ADDRESS_DP[2]), //insert Address 2 signal dual port DPO | ||
.DPRA3(ADDRESS_DP[3]), //insert Address 3 signal dual port DPO | ||
.SPO(O_DATA_OUT[i]), //insert output signal SPO | ||
.DPO(O_DATA_OUT_DP[i]) //insert output signal DPO | ||
); | ||
end | ||
endgenerate | ||
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endmodule | ||
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////////////////////////////////////////////////////////////////////////////// | ||
// Copyright (c) 2011, Andrew "bunnie" Huang | ||
// All rights reserved. | ||
// | ||
// Redistribution and use in source and binary forms, with or without modification, | ||
// are permitted provided that the following conditions are met: | ||
// | ||
// * Redistributions of source code must retain the above copyright notice, | ||
// this list of conditions and the following disclaimer. | ||
// * 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER 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. | ||
// | ||
////////////////////////////////////////////////////////////////////////////// | ||
`timescale 1 ns / 1ps | ||
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module boxtiming ( | ||
input wire pclk, | ||
input wire rstin, | ||
input wire vsync, | ||
input wire hsync, | ||
input wire sync_pol, // 0 means active 0, 1 means active 1 | ||
input wire de, | ||
input wire cv, | ||
input wire [11:0] hpos, | ||
input wire [11:0] hsize, | ||
input wire [11:0] vpos, | ||
input wire [11:0] vsize, | ||
output reg box_active | ||
); | ||
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reg [11:0] hcount; | ||
reg [11:0] vcount; | ||
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reg hsync_v; // active when high | ||
reg hsync_v2; | ||
reg vsync_v; | ||
reg vsync_v2; | ||
reg de_d; | ||
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reg active; | ||
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wire hsync_rising; | ||
wire vsync_rising; | ||
wire de_rising; | ||
wire de_falling; | ||
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always @(posedge pclk or posedge rstin) begin | ||
if( rstin ) begin | ||
hsync_v <= 0; | ||
vsync_v <= 0; | ||
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hsync_v2 <= 0; | ||
vsync_v2 <= 0; | ||
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de_d <= 0; | ||
end else begin | ||
de_d <= de; | ||
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if( cv ) begin | ||
hsync_v <= hsync ^ !sync_pol; | ||
vsync_v <= vsync ^ !sync_pol; | ||
end else begin | ||
hsync_v <= hsync_v; | ||
vsync_v <= vsync_v; | ||
end | ||
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hsync_v2 <= hsync_v; // just a delayed version | ||
vsync_v2 <= vsync_v; | ||
end // else: !if( rstin ) | ||
end // always @ (posedge pclk or posedge rstin) | ||
assign hsync_rising = hsync_v & !hsync_v2; | ||
assign vsync_rising = vsync_v & !vsync_v2; | ||
assign de_rising = de & !de_d; | ||
assign de_falling = !de & de_d; | ||
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always @(posedge pclk or posedge rstin) begin | ||
if( rstin ) begin | ||
hcount <= 0; | ||
end else begin | ||
if( de_rising ) begin | ||
hcount <= 12'b0000_0000_0000; | ||
end else begin | ||
if( de ) begin | ||
hcount <= hcount + 12'b0000_0000_0001; | ||
end else begin | ||
hcount <= hcount; | ||
end | ||
end | ||
end // else: !if( rstin ) | ||
end // always @ (posedge pclk or posedge rstin) | ||
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always @(posedge pclk or posedge rstin) begin | ||
if( rstin ) begin | ||
vcount <= 0; | ||
end else begin | ||
if( vsync_rising ) begin | ||
vcount <= 12'b0000_0000_0000; | ||
end else begin | ||
if( de_falling ) begin // this may be a bug but I think it's worked around elsewhere | ||
vcount <= vcount + 12'b0000_0000_0001; | ||
end else begin | ||
vcount <= vcount; | ||
end | ||
end | ||
end // else: !if( rstin ) | ||
end // always @ (posedge pclk or posedge rstin) | ||
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always @(posedge pclk or posedge rstin) begin | ||
if( rstin ) begin | ||
active <= 0; | ||
end else begin | ||
if( (hcount >= hpos) && (hcount < (hpos + hsize)) && | ||
(vcount >= vpos) && (vcount < (vpos + vsize)) ) begin | ||
active <= 1'b1; | ||
end else begin | ||
active <= 1'b0; | ||
end | ||
end | ||
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box_active <= active; | ||
end // always @ (posedge pclk or posedge rstin) | ||
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endmodule | ||
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