The AL-H264E-4KI422-HW is a hardware-based, feature rich, low latency, high video quality H.264 (AVC) UHD Hi422 Intra encoder IP core. The AL-H264E-4KI422-HW encoder pairs up with the Atria Logic AL-H264D-4KI422-HW low latency decoder for low latency end-to-end links.

The encoder is targeted for medical imaging, broadcast, enterprise/CE and industrial applications. Medical imaging applications include endoscopy, micro surgery and remote assisted surgery and diagnostics. Broadcast applications include video recorders for news and event coverage, film sets and production studios, as well as real-time monitoring of video shoots. Enterprise/CE applications include HDBaseT video transmission over CAT5/6 Ethernet cabling to computer monitors and UHD TV displays. Industrial applications include monitoring of manufacturing plants, and remote manipulation of mobile or fixed light or heavy machinery.

The encoder supports the H.264 Hi422 (High-422) profile at Level 5.1 (3840x2160p30) for Intra-only coding. Support for 10-bit video content means that there is no degradation of grayscale or color gradients in terms of banding. Support for YUV 4:2:2 video content means that there is better color separation, especially noticeable for red colors, which provides much sharper image details. These video quality aspects are especially important in case of medical imaging applications.

Support for Intra-only encoding allows the encoder to encode uncompressed video at frame latencies. A macroblock-line level pipelined architecture brings the latency further down to sub-frame level, at about 0.3msec. When connected to the Atria Logic AL-H264D-4KI422-HW low latency decoder via an IP network, the glass-to-glass latency is about 0.6msec, not taking into account any transmission latency, and otherwise 2 frames with transmission in case of an IP network. Such low latency is important for any closed-loop man-machine application as mentioned here above.

The encoder is implemented in a single Xilinx Zynq-7000 XC7Z045 all programmable SoC. The efficient implementation only takes up 63% of the programmable logic and DSP resources and 36% of the available RAM, leaving ample room for implementation of any other required circuitry. Integration of a Gb Ethernet MAC provides streaming over IP support.

Block Diagram


  • Medical imaging
  • Video recorders for broadcast and film
  • HDBaseT video over CAT5/6
  • Remote monitoring
  • Remote manipulation of machinery


  • H.264 Intra-only Hi422 Level 5.1 encoding
  • 8/10-bit support
  • YUV 4:2:2 support
  • Very low latency at ~0.3sec
  • Variable bit rate (VBR) and constant bit rate (CBR) support
  • VQ at 0.99% SSIM, or 50dB PSNR or higher
  • Gb Ethernet streaming output support
  • Xilinx Zynq-7000 series XC7Z045 SoC implementation


  • Very low latency
  • High video quality
  • UHD resolution
  • Low power
  • Spare on-chip programmable logic and RAM
  • FPGA or ASIC implementations