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55 lines
1.2 KiB
Markdown
55 lines
1.2 KiB
Markdown
Video Mixer is used as a helper to provide a lot of the nice videos that the MiSTer framework supplies. This includes scandoubling, gamma, hq2x scaling, and freezing.
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## Instantiating video_mixer
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The module has a few parameters that are used to set it up.
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* `LINE_LENGTH`
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* `HALF_DEPTH`
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* `GAMMA`
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```verilog
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module video_mixer
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#(
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parameter LINE_LENGTH = 768,
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parameter HALF_DEPTH = 0,
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parameter GAMMA = 0
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)
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(
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input CLK_VIDEO, // should be multiple by (ce_pix*4)
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output reg CE_PIXEL, // output pixel clock enable
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input ce_pix, // input pixel clock or clock_enable
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input scandoubler,
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input hq2x, // high quality 2x scaling
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inout [21:0] gamma_bus,
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// color
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input [DWIDTH:0] R,
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input [DWIDTH:0] G,
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input [DWIDTH:0] B,
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// Positive pulses.
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input HSync,
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input VSync,
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input HBlank,
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input VBlank,
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// Freeze engine
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// HDMI: displays last frame
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// VGA: black screen with HSync and VSync
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input HDMI_FREEZE,
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output freeze_sync,
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// video output signals
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output reg [7:0] VGA_R,
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output reg [7:0] VGA_G,
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output reg [7:0] VGA_B,
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output reg VGA_VS,
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output reg VGA_HS,
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output reg VGA_DE
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);
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```
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