Series 2 FPGA Boards
  USB-FPGA Module 2.18
  USB-FPGA Module 2.16
  USB-FPGA Module 2.14
  USB-FPGA Module 2.13
  USB-FPGA Module 2.12
  USB-FPGA Module 2.01
  FPGA Module 2.00
  Debug Board
  Series 1 Adapter
  Cluster Board
  USB-FPGA Module 2.04
Obsolete products
  Series 1 FPGA Boards
To the ZTEX Shop ZTEX Shop
 SDK and Examples 
  Default Firmware
  Release history
  ZTEX Wiki
Terms and Conditions
    Home / Products         SDK    
    To the ZTEX Shop Shop   
    Wiki         Downloads    
    deutsch     englisch    

Cluster Base Board for ZTEX Series 2 FPGA Boards

To the ZTEX Shop To the shop

The Cluster Base Board connects four Series 2 FPGA Boards to a small cluster node.


  • 10 bit bus connected to all FPGA Boards and the external I/O connectors
  • 44 bit open ring network for board to board communication. First and last FPGA Board are connected to an external I/O connector.
  • Two 2x32 pin headers for external I/O. Each one contains:
    • 10 bit bus signals
    • 44 GPIO's connected to first or last FPGA Board
    • Power supply pins

Additional resources

Schematics (PDF)
Measurements (PDF)

Cluster Base Board for ZTEX Series 2 FPGA Boards

Functional description

External I/O connectors are named CON1 and CON6. Their pin assignment if listed in the table below. Positions of the components which are de described here can be found in the measurements file.

Net list

Each row in the header of the table below lists components that are connected together. The rows in the table body shows which pins of the parts are connected together.

Here are a few examples how the table is read:

  • B8 of CON1 is connected to B6 of FPGA Board 0
  • B8 of CON6 is connected to D6 of FPGA Board 3
  • B6 of Board 1 is connected to D6 of Board 0
  • BUS[0] is connected to A3 of CON1/CON6 and to B3 of Boards 0-3

CON1 PWR Bus Board 0
Bus Board 1 Board 0
Bus Board 2 Board 1
Bus Board 3 Board 2
CON6 PWR Bus Board 3
A3 BUS[0] B3
B3 BUS[1] C3
A4 BUS[2] A4
B4 BUS[3] B4
A5 BUS[4] C4
B5 BUS[5] D4
A6 BUS[6] A5
B6 BUS[7] B5
A7 BUS[8] C5
B7 BUS[9] D5
A8 A6 C6
B8 B6 D6
A9 A7 C7
B9 B7 D7
A10 A8 C8
B10 B8 D8
A11 A9 C9
B11 B9 D9
A12 A10 C10
B12 B10 D10
A13 A11 C11
B13 B11 D11
A14 A12 C12
B14 B12 D12
A15 A13 C13
B15 B13 D13
A16 A14 C14
B16 B14 D14
CON1 PWR Bus Board 0
Bus Board 1 Board 0
Bus Board 2 Board 1
Bus Board 3 Board 2
CON6 PWR Bus Board 3
A17 A18 C15
B17 B18 D15
A18 A19 C19
B18 B19 D19
A19 A20 C20
B19 B20 D20
A20 A21 C21
B20 B21 D21
A21 A22 C22
B21 B22 D22
A22 A23 C23
B22 B23 D23
A23 A24 C24
B23 B24 D24
A24 A25 C25
B24 B25 D25
A25 A26 C26
B25 B26 D26
A26 A27 C27
B26 B27 D27
A27 A28 C28
B27 B28 D28
A28 A29 C29
B28 B29 D29
A29 A30 C30
B29 B30 D30
A32 3.3V
B32 3.3V

Board ID pins

The pins D3 and A3 of each FPGA Board are used as board ID as follows:

A3 D3
Board 0 0 0
Board 1 0 Z
Board 2 Z 0
Board 3 Z Z

Z means that the pin is floating. In order to read the ID out the pins have to be internally pulled up (using the PULLUP constraint).

External Power Supply

The VIN pins of the two external I/O connectors and all FPGA Boards are connected to a bus. This means that all FPGA Boards must be driven by the same power supply. But this also allows to supply the cluster node centrally either by using the pluggable terminal CON7 or by using the DC connector of one of the FPGA Boards. The usage of CON7 is recommended because this connector is designed for large currents. The terminal block is delivered with the Cluster Base Board and has three contacts. The two outer ones are GND (-) and the central one is the supply voltage (+).

JTAG headers

Four standard 14 pin JTAG headers are installed. Each one is connected to the FPGA Board which is next to it.

I/O voltages

The 0 Ω resistors R1 to R3 (1206 packages) can be installed if some of the FPGA boards have I/O voltage pins that are configured as inputs. By default all of them are outputs and therefore R1 to R3 should be open. See the schematics and the FPGA Board description for details.

Pins A31 and B31 of the external I/O connector CON1 are connected to VCCO_AB of the first FPGA Board and A31 and B31 of CON6 are connected to VCCO_CD of the last FPGA Board. By default these pins are 3.3V outputs. If another I/O voltage than 3.3V is desired the 0 Ω resistor on the FPGA Board which connects VCCO_AB or VCCO_CD with 3.3V has to be removed and the I/O voltage has to be supplied through pins A31 and B31 of CON1 or CON6, respectively. See the FPGA Board description for details.

Reset: JP1

Closing jumper JP1 hard-resets all FPGA Boards.


Click on the images for larger versions.

Cluster Base Board for four ZTEX Series 2 FPGA Boards

Cluster Base Board for four ZTEX Series 2 FPGA Boards

[Home]  [Impressum]