VGA Controller¶

Description¶

The VGA Controller is a hardware module that generates timing signals for VGA video output.

Only works for the TE 4-1734682-2 used on the Zedboard.

Generic Name	Type	Default Value	Description
`G_H_PIXELS`	integer	0d640	Horizontal resolution in pixels
`G_H_FRONT_PORCH`	integer	0d16	Horizontal front porch in pixels
`G_H_SYNC_PULSE`	integer	0d96	Horizontal synchronization pulse in pixels
`G_H_BACK_PORCH`	integer	0d48	Horizontal back porch in pixels
`G_V_PIXELS`	integer	0d480	Vertical resolution in pixels
`G_V_FRONT_PORCH`	integer	0d10	Vertical front porch in pixels
`G_V_SYNC_PULSE`	integer	0d2	Vertical synchronization pulse in pixels
`G_V_BACK_PORCH`	integer	0d33	Vertical back porch in pixels

Port Name	Type	Direction	Default Value	Description
`CLK_SYS`	std_logic	in	-	Input system clock
`RST_SYS_P`	std_logic	in	-	Input system clock domain asynchronous reset, active high
`I_MANUAL_COLORS`	vector[11:0]	in	-	Red color channel input (4-bit) & Green color channel input (4-bit) & Blue color channel input (4-bit)
`CLK_VGA`	std_logic	in	-	Input vga clock
`RST_VGA_P`	std_logic	in	-	Input VGA clock domain asynchronous reset, active high
`O_HSYNC`	std_logic	out	0b0	Horizontal sync signal output
`O_VSYNC`	std_logic	out	0b0	Vertical sync signal output
`O_RED`	vector[3:0]	out	0x00	Red color channel output (blanked during inactive regions)
`O_GREEN`	vector[3:0]	out	0x00	Green color channel output (blanked during inactive regions)
`O_BLUE`	vector[3:0]	out	0x00	Blue color channel output (blanked during inactive regions)
`O_H_POSITION`	vector[15:0]	out	0x00	Current horizontal pixel position within active region
`O_V_POSITION`	vector[15:0]	out	0x00	Current vertical pixel position within active region
`O_ACTIVE`	std_logic	out	0b0	Active display region flag (high during visible area)

The input vector I_MANUAL_COLORS is coming from the CLK_SYS clock domain and must be resynchronized to the CLK_VGA clock domain.

The VGA controller module instantiates the olo_base_cc_status module with the following generics:

Generic Name	Type	Default Value	Description
`Width_g`	positive	0d12	Width of the data-signal to clock-cross
`SyncStages_g`	positive	0d2	Number of synchronization stages.