IT66021FN HDMI 1.4 接收器 datasheet

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"IT66021FN是一款单端口HDMI 1.4接收器，支持3D功能，并兼容HDCP 1.4和DVI 1.0规格，内置深色技术，提供高质量无压缩视频内容的稳定接收。此外，它还支持所有主要的3D格式，与HDMI 1.4b 3D规范一致。该设备能输出多种视频格式，并提供最多4通道的I2S数字音频输出，采样率最高可达192kHz，样本大小可达24位，便于直接连接到低成本音频DAC。同时，它还具有S/PDIF输出，支持压缩音频，帧率最高可达192kHz。每个IT66021FN都预装了独特的HDCP密钥，符合HDCP 1.4标准，确保高清内容的安全传输。" 详细说明： 1. **产品概述**：IT66021FN是单端口HDMI接收器，设计符合HDMI 1.4b标准，并且向下兼容DVI 1.0。此设备特别强调了对3D功能的支持，满足HDMI 1.4b 3D规范。 2. **深色技术**：IT66021FN支持高达36位的深色技术，这意味着它可以处理更丰富的颜色信息，提供更细腻、更真实的图像质量，适合高分辨率视频内容的传输。 3. **3D格式支持**：设备支持所有主要的3D视频格式，这包括帧包装、场包装、行交错和侧-by-side等，适用于各种3D显示设备。 4. **音频功能**：IT66021FN提供多达4个I2S数字音频输出通道，支持的采样率高达192kHz，样本大小可达到24位，这意味着它可以处理高保真音频，适合音频爱好者和专业音频系统的应用。此外，还有一个S/PDIF输出接口，用于支持压缩音频格式，最大帧率为192kHz。 5. **HDCP兼容性**：每个芯片都内置了HDCP 1.4标准的唯一密钥，这确保了通过HDMI接口传输的高清内容能够受到版权保护，防止非法复制。 6. **安全性**：HDCP（High-bandwidth Digital Content Protection）密钥的存在，使得IT66021FN能够提供安全的高清内容传输，这是现代多媒体设备中不可或缺的功能，尤其是对于播放受保护的高清电影和电视节目。这款器件广泛应用于高清电视、投影仪、显示器、AV接收器和其他需要接收和处理HDMI信号的设备中，其强大的功能和高兼容性使其成为高清和3D视听系统中的理想选择。

IT66021FN

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Receiver Analog Frontend (Rcvr. AFE)

The integrated TMDS receiver analog frontend macros are capable of receiving and decoding HDMI

data at up to 3.0Gbps (with a TMDS clock of 300MHz). Adaptive equalization is employed to support

long cables.

Figure 3. Video Data Processing flow of the IT66021FN

Video Data Processing Flow

Figure 3 depicts the video data processing flow. For the purpose of retaining maximum flexibility, most

of the block enablings and path bypassings are controlled through register programming. Please refer

to IT66021FN Programming Guide for detailed and precise descriptions.

As can be seen from Figure 3, the received and recovered HDMI raw data is first HDCP-decrypted.

The extracted video data then go through various processing blocks, as described in the following

paragraphs, before outputting the proper video format to the backend video controller.

The video processing including YCbCr up/down-sampling, color-space conversion and dithering.

Depending on the selected input and output video formats, different processing blocks are either

enabled or bypassed via register control. For the sake of flexibility, this is all done in software register

programming. Therefore, extra care should be taken in keeping the selected output format and the

corresponding video processing block selection. Please refer to the IT66021FN Programming Guide

for suggested register setting.

The output interface could be configured through register setting to provide various data formats as

listed in Table 1 in order to cater to different preferences of different backend controllers.

Major video processing in the IT66021FN are carried out in 14 bits per channel in order to minimize

IT66021FN

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rounding errors and other computational residuals that occur during processing. General description

of video processing blocks is as follows:

HDCP engine (HDCP)

The HDCP engine decrypts in incoming data. Preprogrammed HDCP keys are embedded in the

IT66021FN. Users need not worry about the purchasing and management of the HDCP keys as ITE

Tech. will take care of them.

Up-sampling (YCbCr422 to YCbCr444)

In cases where input HDMI video data are in YCbCr 4:2:2 format and output is selected as 4:4:4, this

block is enabled to do the upsampling. Well-designed signal filtering is employed to avoid visible

artifacts generated during upsampling.

Bi-directional Color Space Conversion (YCbCr <-> RGB)

Many video decoders only offer YCbCr outputs, while DVI 1.0 supports only RGB color space. In order

to offer full compatibility between various Source and Sink combination, this block offers bi-directional

RGB <-> YCbCr color space conversion (CSC). To provide maximum flexibility, the matrix coefficients

of the CSC engine in the IT66021FN are fully programmable. Users could elect to employ their

preferred conversion formula.

Down-sampling (YCbCr444 to YCbCr422)

In cases where input HDMI video data are in YCbCr 4:4:4 format and output is selected as YCbCr

4:2:2, this block is enabled to do the downsampling. Well-designed signal filtering is employed to avoid

visible artifacts generated during downsampling.

Dithering (Dithering 10-to-8 or 12-to-8)

For outputing to the 8-bits-per-channel formats, decimation might be required depending on the exact

input formats. This block performs the necessary dithering for decimation to prevent visible artifacts

from appearing.

Supported output Video Formats

Table 1 lists the output video formats supported by the IT66021FN. The listed Output Pixel Clock

Frequency in MHz is the actual clock frequency at the output pin PCLK, regardless of the color depth.

According to the HDMI Specification v1.4b, the input TMDS clock frequency could be 1.25 times or 1.5

times that of the output PCLK frequency, depending on the color depth:

For 24-bit inputs, TMDS Clock frequency = 1 x PCLK frequency

For 30-bit inputs, TMDS Clock frequency = 1.25 x PCLK frequency

For 36-bit inputs, TMDS Clock frequency = 1.5 x PCLK frequency

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