General programmable SoC trend in video surveillance

Since the digital video surveillance system contains not only video compression codec processing suitable for DSP, but also a large number of control, management, storage and network functions suitable for the CPU, a higher degree of integration will be achieved through the SOC. The SOC generally recognized in the industry has a single-chip integrated system with two or more processor cores, and it can have a CPU main processor, as well as a DSP and coprocessor-like soft core, the latter of which is an ASIC The class's hard core can even include other dedicated processing subsystems, and integrates a wealth of peripheral interfaces.

As we all know, general-purpose programmable DSP has led the rise of digital video surveillance. However, like the process of continuous industrialization of digital video products, when the technology matures at a certain stage, there will be many customized devices to participate in the competition, which is On the basis of continuous improvement, the programmable platform must continue to innovate, and even a breakthrough in new concepts can be invincible. Since the digital video surveillance system contains not only video compression codec processing suitable for DSP, but also a large number of control, management, storage and network functions suitable for the CPU, a higher degree of integration will be achieved through the SOC. The full name of SOC is System On Chip. With regard to its Chinese translation rules, those who are benevolent see benevolence, while those who are wise see wisdom. Some people think it is literally translated as "system on chip", and some people think it seems that "single chip system" is more accurate. The SOC generally recognized in the industry has a single-chip integrated system with two or more processor cores, and it can have a CPU main processor, as well as a DSP and coprocessor-like soft core, the latter of which is an ASIC The class's hard core can even include other dedicated processing subsystems, and integrates a wealth of peripheral interfaces. The following will discuss the advantages and trends of SOC development in conjunction with the application of Texas Instruments' general programmable single-chip system in digital video surveillance.


A single SoC platform for multiple products


The general programmable platform for video surveillance products planned by TI started with the DM642 general media processor. This is a chip with DSP as the core and a rich peripheral interface. Its cumulative global sales have exceeded 10 million. sheet. Based on this, TI has planned the Davinci platform, which is a series of SOCs that fully embodies the characteristics of the single-chip system. It can be applied to the multi-channel design of embedded DVR and NVR, as well as DVS. And the demand of IPC, so a platform can support the development of many different types of products, effectively reduce R & D investment and accelerate the product launch cycle.


DM644X is the first Davinci chip. The integrated CPU is ARM9 core, the integrated DSP is C64 + core, and the video coprocessor VICP is also integrated. In addition, the integrated video subsystem includes both the front end and the back end. The front end can be directly connected to the CCD or CMOS video sensor, and is equipped with image zoom and preview tools. There is also the so-called "3A" function, that is, automatic white balance, automatic Exposure and auto focus control unit; the back end integrates multi-layer subtitle overlay (OSD), four video DACs and 24-bit digital RGB output. The integrated peripherals include Ethernet interface, PCI interface, SPI serial interface, ASP audio interface, USB2.0 interface, ATA hard disk interface, MMC / SD memory card interface, etc. The software development is open, and the industry-recognized multimedia API can be used to integrate the software system. Figure 1 shows a video surveillance product based on DM644x.



Figure 1 DM644x-based video surveillance products

The Davinci series contains mature video software, complete development tools and strong technical support, so a prototype design can derive more product forms such as digital video recorders, digital video servers and IP network cameras. What Davinci builds is a digital media development framework that will be shared by various series of platforms.

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