Data ID
ECC
Word count
. . .
Checksum
. . .
1 byte
2 bytes
1 byte
1 byte
1 byte
1 byte
1 byte
2 bytes
Checksum
Packet header
Variable size payload
5b
5b
5b
5b
6b
6b
0
R
0
4
R
4
5
G
0
2
G
5
3
B
0
1 byte
1 byte
7
B
4
5b
6b
5b
. . .
7
G
2
0
G
3
Pixel 1
Pixel 1
Data type
V
irtual channel ID
Pixel n
dss-157
Public Version
Display Subsystem Environment
www.ti.com
Figure 7-57. 16 Bits per Pixel RGB Color Format, Long Packet
Packed pixel stream 16-bit format is a long packet used to transmit image data formatted as 16-bit pixels
to a video mode display module. The packet consists of the DI byte, a two-byte WC, an ECC byte, a
payload of length WC bytes, and a two-byte checksum. Pixel format is five bits red, six bits green, five bits
blue, in that order. Note that the green component is split across two bytes. Within a color component, the
LSB is sent first, the MSB last.
7.2.3 TV Display Support
The TV display path includes the following modules:
•
Display controller
•
Video encoder
•
Video DAC stage comprising two single 10-bit DACs (AVDAC1 and AVDAC2) with video amplifiers
The display controller module receives synchronization signals from the video encoder and synchronously
sends pixel data to the video encoder with these signals. The digital output of the display controller is
always a 24-bit RGB value based on a pixel request from the video encoder.
The video encoder converts RGB video signals to conform to the NTSC/PAL standard analog video. The
video encoder includes an integrated synchronization signal generator and two single channel video
digital-to-analog converters (DACs) with video amplifiers, data manager, luma stage, chroma stage,
modulator, and a control interface.
The video encoder also provides the synchronization signals to the display controller: VSYNC, active
VIDeo (AVID), and field ID (FID).
is a block diagram of the TV display interface (S-video mode, DC coupled, High Full Scale
Swing).
1612
Display Subsystem
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated