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Video Processor Module (Continued)

6.2.2

Video Block

The Video block receives video data from the VIP block or

the GX1 module’s video frame buffer. The video data is for-

matted and scaled and then sent to the Mixer/Blender. The

video data also changes clock domains while in the Video

block. It is clocked in with the GX1 module’s video clock

and it is clocked out with the GX1 module’s graphics clock.

A diagram of the Video block is shown in Figure 6-7.

6.2.2.1

Video Input Formatter

The Video Input Formatter accepts video data 8 bits at a

time in YUV 4:2:2, YUV 4:2:0, or RGB 6:5:6 format. The

GX1 module’s video clock is the source clock. The data can

be interlaced or progressive. When the data comes directly

from the VIP block it is usually interlaced. The video format

is configured via the EN_42X bit (F4BAR0+Memory Offset

00h[28] and the GV_SEL bit (F4BAR0+Memory Offset

4Ch[13]). The byte order for each format is configured in

the VID_FMT bits (F4BAR0+Offset 00h[3:2]).

RGB 5:6:5 – For this format each pixel is described as a

16-bit value:

Bits [15:11] = Red

Bits [10:5] = Green

Bits [4:0] = Blue

YUV 4:2:0 – This format is not supported by the GX1 mod-

ule. The Horizontal Downscaler in the Video block cannot

be used if the video data is in this format. In this format, 4

bytes of data are used to describe two pixels. The 4 bytes

contain two Y values one for each pixel; one U and one V

for both pixels. For each horizontal line, all the Y values are

received first. TheU values arereceivednextand theV

values are received last. For example for a horizontal line

that has 720 pixels, there are 720 bytes of Y, followed by

360 bytes of U, followed by 360 bytes of V.

YUV 4:2:2 –InthisformateachDWORD in thehorizontal

line represent two pixels. There are two Y values and one

each U and V in a DWORD. Just as in the YUV 4:2:0 for-

mat, each U and V value describes the two pixels.

Figure 6-7. Video Block Diagram

Video Input

Formatter

4-Tap Horizontal

Downscaler

m+1

GX1

Direct

Video Input

Line Buffer 0

Line Buffer 1

Line Buffer 2

Formatter

4:4:4

2-Tap Vertical

Interpolating Upscaler

2-Tap Horizontal

Interpolating Upscaler

YUV 4:4:4/RGB 5:6:5

Video

Module

(3x360x32 bit)

(4:2:2 or 4:2:0)

SC2200 Datasheet(PDF) 323 Page - National Semiconductor (TI)

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