ST GM68020H User Manual
GM68020H
DisplayPort receiver
Data Brief
Features
■ DisplayPort™ 1.1a compliant receiver
■ HDCP 1.3 support
■ DisplayPort link comprising four main lanes
and one auxiliary channel
■ Input bandwidth sufficient to receive AV
streams up to WQXGA @ 60 Hz or Full
HD@120 Hz, along with 24-bit audio streams
@192 kHz
■ 60-bit LVTTL output configurable as single port
or dual port with single pixel per clock or two
pixels per clock
■ RGB or YCbCr output color format
RGB / YCbCr 4:4:4 - 1x60, 1x48, 1x30, 1x24
YCbCr 4:2:2 - 1x24, 1x20, 1x16
■ Color space conversion from RGB to YUV, and
YUV to RGB
DP Input
DisplayPort
Receiver
Image
Capture
■ I2S (8 channel) or SPDIF audio output ports
compliant with IEC60958 and IEC61937
formats
■ Two wire host interface
■ General purpose inputs/outputs
(Total of 25)
■ Energy Spectrum Management® (ESM®)
■ Package: 160-pin PQFP
Applications
■ Interface for the digital reception of
uncompressed audio-visual streams in TV and
PC applications
■ Applications that require high bandwidth and
long reach cables, such as projectors
TTL Video
Format
Conversion
Bus Formatter
TTL Outputs
I2S/SPDIF
Transmitter
Clock Generation OCM, SPI GPIO I2C MasterI2C Slave
I2S/SPDIF Audio
November 2008 Rev 1 1/7
For further information contact your local STMicroelectronics sales office.
www.st.com
7
Description GM68020H
1 Description
The GM68020H is a DisplayPort receiver IC designed for the reception of secure, highbandwidth, uncompressed digital audio-video signals for next-generation TV, projector, and
PC display systems. It has a single link DisplayPort input comprising four main lanes and
one auxiliary channel. The total available link bandwidth is 10.8 Gbps suitable for high
resolution digital video content. The DisplayPort link bandwidth in GM68020H can support
full HD video (1080p 30-bit color per pixel) @ 120 Hz or support 2560 x 1600 @ 60 Hz
graphics along with corresponding audio streams. Unlike conventional display interfaces,
DisplayPort link bandwidth can be freely traded between video resolution, refresh rate, and
pixel bit depth. The auxiliary channel is a 1 Mbps bidirectional, half-duplex interface
dedicated for link and device management.
The GM68020H supports RGB and YUV video color formats with a color depth of 12 (YUV
4:2:2 only), 10, and 8 bits. The GM68020H also supports both compressed and
uncompressed audio formats. The 60-bit LVTTL output ports on GM68020H can be mapped
to receive video data streams either in two pixels per clock or single pixel per clock of
chosen color depth. If the received data comprises audio streams, the extracted audio
signal is sent out on the digital audio output bus. This device can support up to 8 channel
LPCM audio, or a single wire SPDIF encoded audio. The GM68020H supports HDCP 1.3
content protection scheme for secure reception of digital audio-video content.
The GM68020H can be configured by an external Host through the I2C host interface. This
IC also includes general purpose inputs/outputs that can be used for controlling system
components. The GM68020H features color space converter (RGB to YUV, and YUV to
RGB) and sample structure converter (4:4:4 to 4:2:2 and 4:2:2 to 4:4:4) for flexible interface
with external video processing devices.
Figure 1. System diagram
SPI Flash
Crystal
SPI
TTL (60-bit)
DisplayPort
GM68020H
TV Controller
GM68020H
I2S/SPDIF
EDID
GPIO
2/7
I2C
GM68020H Benefits
2 Benefits
● Proven interoperability with all major DisplayPort vendors
● HDCP 1.3 support
● On-chip Microprocessor enables stand-alone operation for customized applications
● Flexible interface to ease system design – DP 1, 2, 4 lane configuration, 60/48/30/24
TTL port, YUV/RGB color format
● Low EMI
● Low power
3/7
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