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Signals, Signals -3 – Altera Embedded Peripherals IP User Manual

Page 244

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Parameter Name

Description

Vertical Sync Pulse

Lines

The width of the v-sync pulse in number of lines.

Vertical Front Porch

Lines

The number of blanking lines that follow the active lines. During this

period, there is no data flow from the Avalon-ST sink port to the LCD

output data port.

Number of Columns The number of active pixels in each line.
Horizontal Blank

Pixels

The number of blanking pixels that precede the active pixels. During this

period, there is no data flow from the Avalon-ST sink port to the LCD

output data port.

Total Horizontal

Scan Pixels

The total number of pixels in one line. The value is the sum of the

following parameters: Number of Columns, Horizontal Blank Pixel, and

Horizontal Front Porch Pixels.

Beats Per Pixel

The number of beats required to transfer one pixel. Valid values are 1 and

3. This parameter, when multiplied by Data Stream Bit Width must be

equal to the total number of bits in one pixel. This parameter affects the

operating clock frequency, as shown in the following equation:
Operating clock frequency = (Beats per pixel) * (Pixel_rate), where

Pixel_rate (in MHz) = ((Total Horizontal Scan Pixels) * (Total Vertical

Scan Lines) * (Display refresh rate in Hz))/1000000.

Vertical Blank Lines The number of blanking lines that proceed the active lines. During this

period, there is no data flow from the Avalon-ST sink port to the LCD

output data port.

Data Stream Bit

Width

The width of the inbound and outbound data.

Signals

Table 24-2: Video Sync Generator Core Signals

Signal Name Width (Bits)

Direction

Description

Global Signals

clk

1

Input

System clock.

reset

1

Input

System reset.

Avalon-ST Signals

data

Variable-

width

Input

Incoming pixel data. The datawidth is determined by the

parameter Data Stream Bit Width.

ready

1

Output

This signal is asserted when the video sync generator is

ready to receive the pixel data.

UG-01085

2014.24.07

Signals

24-3

Video Sync Generator and Pixel Converter Cores

Altera Corporation

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