Specifications

Ref# 420826 Intel
®
Atom™ processor CE4100 67
Platform Design Guide
Intel Confidential
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This chapter provides major video interfaces design guidelines on Intel
®
Atom™ processor
CE4100-based board.
• VDAC analog Interfaces
• One HDMI/DDC transmitter Interfaces
• Multiple Transport Stream Interfaces
6.1 Video DAC Interface
The Video encoder unit supports the traditional analog interfaces (Composite Video,
Component Video and S-Video). The component video can support up to 1080P resolution
with YPrPb format. This video encoder unit supports various analog formats (NTSC/PA), VBI
and close-caption support, as well as the control/compensation logic for 4 video DACs.
Table 6-1. Video DAC Signals
Signal Name Type
1
Description
VDACOUTA_P, [Pb]
VDACOUTB_P, [Y]
VDACOUTC_P, [Pr]
VDACOUTD_P, [CVBS]
AO Video DAC current outputs. Connected to a 37.4 Ω loads for fastest
response time.
VDACOUTA_N, VDACOUTB_N,
VDACOUTC_N, VDACOUTD_N
AO Video DAC Complementary Outputs. Used for calibration. Connected
to VSS via 1.1-KΩ resistor or through 1:2 switches (SPDT). During
calibration mode, the pin is connected to a 1.1-kΩ resistor and in
functional mode, the pin is connected to ground directly.
VDAC_CAL O 3.3V output buffer to control switches on the complementary outputs
of the 4 channels during calibration sequence.
Since the DAC operates at high pixel frequencies, special attention should be paid to signal
integrity and EMI. RGB routing, component placement, component selection, cable and load
impedance (monitor) all play a large role in the analog display’s quality and robustness. This
holds true for all resolutions.