Mirror Box

一客户提出这么一个应用：Image Mirror Box。如下图！

对于大部分的显示器，我们可以对显示器进行翻转，然而仅仅是旋转，确是做不到类似图上的功能，然而，这个功能有啥用处？没想明白，3D也不是这么用的啊，难道在应用一个镜面在反射一次？假设在操作台上装一面镜子，那么就可以在镜子里显示其正确的图像，可是这么做有啥意义，直接把显示器坐在桌面上不就可以了么？唉，确实没想明白啊，但是没办法，我们还是得讨论他的可行性。

谁要是知道可以告诉我啊！

看技术指标：

• Horizontal mirror flip.
• Allow for 1080p resolution at a 120hz frame rate (Dual-link DVI).

至于翻转，我们可以这样，采用一个DVI的receiver，接收到信号后，给FPGA处理，这个处理就比较简单了，然后在找一个transistor，把DVI信号发送出去就可以了。

那么我们来算算像素点吧：1920*1080*120*24= 5971968000 =5G

这带宽也太大了吧，我们常用的液晶显示器，不是一般也就60hz么，这个要大一倍了。

对于大部分的DVI收发器，其数据位宽一般是24位，165M，也就是说必须要找到一个

1920*1080*120=248832000，加上EDID信号，数据带宽应在250M以上。

查找了ADI的选型指南，确实没有找到合适的IC。

在Analog Devices Wordwide technical support下的EngineerZone发现了一篇帖子，看到了希望：

有人问道：

Hello.

I have a requirement to design a system which receives a 1080p 120Hz video input (audio not necessary). It just needs to receive the video data and pass it to an FPGA (preferably in 24-bit RGB with HS, VS, and DE) which manipulates the video content before displaying it. All the HDMI receivers seem to only accept 1080p 60Hz. It should be possible using HDMI dual-link, but I haven't been successful in finding anything on the Analog Devices website that will enable dual-link. Perhaps there is a way to use two AD9880 and assemble the data in the FPGA, but a simpler technique is preferred.

 Does anyone have advice on what options are available?

Thanks.

J.M.D.

最后有人回复到：

看来是很有希望，果断查了一下ADV7619，在刚好一年后的今天，这个IC已经Released not under NDA。

The ADV7619 is a high quality, two input, one output (2:1) multiplexed High-Definition Multimedia Interface (HDMI®) receiver. The ADV7619 is a high quality, two input, one output (2:1) multiplexed High-Definition Multimedia Interface (HDMI®) receiver. The ADV7619 is offered in professional (no HDCP) and commercial (with HDCP) versions. The operating temperature range is 0°C to 70°C.

The ADV7619 incorporates a dual input HDMI-capable receiver that supports all mandatory 3D TV formats defined in the HDMI 1.4a specification, HDTV formats up to 1080p 36-bit Deep Color/2160p 8-bit, and display resolutions up to 4k × 2k (3840 × 2160 at 30 Hz). It integrates an HDMI CEC controller that supports the capability discovery and control (CDC) feature.

The ADV7619 incorporates Xpressview™ fast switching on both input HDMI ports. Using the Analog Devices, Inc., hardware-based HDCP engine to minimize software overhead, Xpressview technology allows fast switching between both HDMI input ports in less than 1 sec.

Each HDMI port has dedicated 5 V detect and Hot Plug™ assert pins. The HDMI receiver also includes an integrated program-mable equalizer that ensures robust operation of the interface with long cables.

The ADV7619 offers a flexible audio output port for audio data extraction from the HDMI stream. HDMI audio formats, includ-ing SACD via DSD and HBR, are supported by the ADV7619.

The HDMI receiver has advanced audio functionality, such as a mute controller, that prevents audible extraneous noise in the audio output. Additionally, the ADV7619 can be set to output TDM I2S, which provides four multiplexed I²S channels.

The ADV7619 contains one main component processor (CP), which processes video signals from the HDMI receiver up to 1080p 36-bit Deep Color. It provides features such as contrast, brightness and saturation adjustments, STDI detection block, free-run, and synchronization alignment controls.

For video formats with pixel clocks higher than 170 MHz, the video signals received on the HDMI receiver are output directly to the pixel port output. To accommodate the higher bandwidth required for these higher resolutions, the output on the pixel bus consists of two 24-bit buses running at up to 150 MHz: one bus contains the even pixels, and the other bus contains the odd pixels. When these two buses are combined, they allow the transfer of video data with pixel clocks up to 300 MHz. In this mode, both 4:4:4 RGB 8-bit and 4:2:2 12-bit are supported.

Fabricated in an advanced CMOS process, the ADV7619 is provided in a 14 mm × 14 mm, 128-lead, surface-mount, RoHS-compliant TQFP_EP package and is specified over the 0°C to 70°C temperature range.

速度300M，看来是可以满足指标要求了，下班了，明天继续看看，是否有其对应的transistor