Full hardware TCP/UDP protocol stack realize both high performance and guaranteed delivery


Our TCP/UDP offload engine supports simultaneous connection of more than 10,000 sessions on a single core, which is a feature of our IP along with its high quality and performance.

Two types of IP are available, one for embedded devices and the other for servers.
For embedded devices, our TCP/UDP offload engine provides high-speed communication at over 10 Gbps with ultra-low power consumption. For servers, it provides high performance and low CPU load as a back-end for load balancer, CDN, KVS, Memcached, and other applications.



  • High Performance

    Because of full hardware TCP stack, high throughput (100G-Ethernet compliant) and ultra-low latency processing is possible without using CPU. It can also handle more than 10000 simultaneous connections.

  • High Quality

    Full TCP functionality guarantees data delivery. In addition, high reassemble capability and flow control based on network conditions ensure efficient and lean transfer in any (lossless and lossy) environment.

  • Software Compatibility

    Customer's software applications will run without any modifications. The benefits of hardware offload can be provided immediately.

Full functional protocol stack

Our TCP/UDP offload engine takes over the CPU’s responsibility for TCP and UDP protocol processing at the transport layer, including IP, ARP, and ICMP at the lower layers.
It reduces the CPU load to almost zero by replacing all functions such as ARP processing, retransmission, fast retransmission, and flow control with hardware. TCP communication using only hardware without CPU is also possible.


The interface for the CPU, or the interface for the hardware (the user logic).
Using TCP offloading, the user specifies an IP address to connect, the connection is established through a 3-way handshake, which also handles the ARP required for ARP resolution. In addition, the engine has all the other functions required for TCP, including Active Open, Passive Open, Retransmit, Fast Retransmit, Timeout, Flow Control, and Window Probe.

Software Integration

We provide drivers integrated with Linux and real-time OSs (RTOS, Zephyer, etc.). For example, applications that have been using socket libraries under Linux can be replaced by hardware processing under the socket API without any modification.

Comparison on Xilinx Zynq board (ZCU102)

Xilinx ZCU102 is a SoC (System On Chip) type FPGA device evaluation board with an ARM CPU mounted on the FPGA.
When measured using iperf, a TCP performance measurement tool, with an ARM CPU alone, the throughput is 2.1 Gbps for transmit and 1.5 Gbps for receive, but by adding a PTU, the throughput becomes 9.0 Gbps for transmit and 8.2 Gbps for receive without CPU load. The throughput is 9.0Gbps transmitting and 8.2Gbps receiving.



802.3, ARP, ICMP, IPv4, TCP, UDP, RTP, TLS


Throughput: 40Gbps (100Gbps Scheduled)


Offloading: Packet generation, Checksum, 3-way handshake, Retransmission, Fast Retransmit, Flow control, TCP reassemble, Delayed Ack (Equivalent to BSD socket)
Maximum connections: 16,000
Throughput: 40Gbps / core


Over 10,000 sessions
H.264 over RTP
Custom support for other protocols


Intel, Xilinx
Also available on Intel PAC and Xilinx Alveo