Ruprecht-Karls-Universität Heidelberg

The HTX3-Board – A universal HTX test platform


The HTX3-Board provides a comfortable and efficient way to evaluate user specific devices connected to the Hypertransport 3 connector standardized under the name HTX3-Connector™. The HTX3-Board with the 8bit wide high speed serial tranceiver based HTX Interface can be plugged to any AMD Opteron™ processor node with HTX. The board employs a Stratix IV FPGA with 228k logic elements to provide enough ressources to implement both the HT3-Core and user application modules within a single FPGA. To support the high link frequencies of HT3 transceiver blocks (GXB) supporting data rates of up to 8.5 Gbps are used to implement the HyperTransport links.

The FPGA can be configured via JTAG or by flash memory.

Technical Specification

  • HTX Connector with 8bit transceiver based bidirectional interface
  • Altera Stratix IV GX 230 (or larger)
    • speed grade -2, -3 or -4 (For more details please refer to the Stratix IV user manual.)
  • 256 MB onboard DDR3-1066 memory
  • 2 CX4 connectors routed to FPGA transceivers
  • Marvel 88E1111 Ethernet solution
  • USB2 connectivity via Mini-USB connector and Cypress CY7C68013A High-Speed USB Peripheral Controller
  • Additional external connectivity with Stratix LVDS interface

Optionally, an HTX-Extender board with test pins for LSA connection is available. The HTX-Board can also be used as a stand-alone FPGA design testbed.

The HTX-Board is a development of the University of Heidelberg, ZITI, Computer Architecture Group.


Flyer with basic information (pdf)
Short datasheet (one side) with most important facts regarding the HTX3-Board.

HyperTransport Logo


Photo of HTX3-Board

Assembled board with Stratix IV

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