DVB-GSE Ethernet Tunnel IP Cores

DVB-GSE encapsulator and de-encapsulator IP cores with AXI4-Stream interconnect to/from (RG)MII interfaces.

Features: 
  • GSE encapsulation of Ethernet frames (via the DVB-GSE Bridged Frame Mandatory Extension Header)
  • Designed for high throughput and low latency
  • Configurable MTU’s, SRAM/buffer sizes, and packing & fragmentation modes
  • Supports GSE packet header types for no labels, 6 byte labels, label reuse, and label-based filtering
  • Low (logic and SRAM) resource usage
  • Support for both 16200b and 64800b BBFRAME’s, and all DATA FIELD sizes
  • AXI4-Stream Interconnect (to/from PHY’s and FEC units)
  • Wishbone (SPEC B4) interface for control and packet/device statistics
  • CRC-8 for BBFRAME’s, and CRC-32 for reassembled PDU’s and Ethernet frames
  • Robust exception handling and with rapid recovery from exceptions (due to overflows & invalid input data)
  • Can be configured for single- or dual- clock operation
Deliverables: 
  • Netlist or synthesisable RTL source code in VHDL
  • Comprehensive verification test bench and vectors in VHDL
  • User guides and documentation for integration & configuration
  • Top-level entities for CCM-only, Ethernet-tunneling systems to aid with evaluation and rapid-prototyping
Overview: 

High-throughput, low-latency Ethernet frame parsers & generators, and DVB-GSE encapsulator & de-encapsulator IP cores, for building datalink systems that transport Ethernet frames using DVB-GSE. The IP Core Worx DVB-GSE IP cores have been optimised for high performance, and also for DVB-S2/-T2/ C2 implementations that have strict resource/area constraints; for example, FPGA-based systems.

Pairing the IP Core Worx DVB-GSE Ethernet tunnel encapsulator core with its corresponding de-encapsulator core minimises the footprint & complexity of a bidirectional DVB-GSE system. (De-)Encapsulating of just layer 2 (Ethernet) traffic shifts the tasks of routing & QoS to external cores or devices (at each end of the Ethernet tunnel), increasing system flexibility and reducing FPGA resource requirements.

Performance: 

The following table shows the resource utilisation for various IP Core Worx DVB-GSE cores, when using Xilinx Vivado for synthesis, and targeting Xilinx ZYNQ devices. The designs satisfy the timing constraints at more than 160 MHz (ZYNC devices) – exceeding GbE performance with FPGA-based designs.

Resource IP_TO_GSE GSE_TO_IP ETH_TO_GSE GSE_TO_ETH
LUT6 720 303 1086 638
DFF 411 228 655 455
RAM36 0.5 0.5 2 1.5
DSP 0 0 0 0
BUFG 1 1 1 1