数字媒体系统级芯片（ DMSoC ） Digital Media System-on-ChipDMSoC
The DM355 is a highly integrated, programmable platform for digital still camera, digital photo frames, IP security cameras, 4-channel digital video recorders, video door bell application, and other low cost portable digital video applications. Designed to offer portable video designers and manufacturers the ability to produce affordable portable digital video solutions with high picture quality, the DM355 combines high performance MPEG4 HD 720p codecs and JPEG codecs up to 50M pixels per second, high quality, and low power consumption at a very low price point. The DM355 also enables seamless interface to most additional external devices required for a complete digital camera implementation. The interface is flexible enough to support various types of CCD and CMOS sensors, signal conditioning circuits, power management, DDR/mDDR memory, SRAM, NAND, shutter, Iris and auto-focus motor controls, etc.
The DM355 processor core is an ARM926EJ-S RISC processor. The ARM926EJ-S is a 32-bit processor core that performs 32-bit and 16-bit instructions and processes 32-bit, 16-bit, and 8-bit data. The core uses pipelining so that all parts of the processor and memory system can operate continuously. The ARM core incorporates:
DM355 performance is enhanced by its MPEG4/JPEG coprocessor. The MPEG4/JPEG coprocessor performs the computational operations required for image processing; JPEG compression and MPEG4 video and imaging standard. The MPEG4/JPEG coprocessor supports MPEG4 SP at HD 720p, D1, VGA, SIF encode/decode resolutions and JPEG encode/decode up to 50M pixels per second.
The DM355 device has a Video Processing Subsystem VPSS with two configurable video/imaging peripherals:
The VPFE port provides an interface for CCD/CMOS imager modules and video decoders. The VPBE provides hardware On Screen Display OSD support and composite NTSC/PAL and digital LCD output.
The DM355 peripheral set includes:
For software development support the DM355 has a complete set of ARM development tools which ninclude: C compilers, assembly optimizers to simplify programming and scheduling, and a Windows debugger interface for visibility into source code execution.
