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USB-FPGA Module 1.15:
Spartan 6 LX45, LX75 and LX150 FPGA Board with USB 2.0 Microcontroller and 128 MByte DDR2 SDRAM

USB-FPGA Modules 1.15 are deprecated. Please switch to Series 2 FPGA Boards.

An Adapter is available as workaround.

The old product page is still available here for documentation purposes.

Table of Contents

Block diagram
SDK, Examples, getting started
Functional description
    FPGA configuration
    EEPROM address: JP1
    FPGA state: LED1
    Clock resources
    Configuration booster CPLD
    I/O connector
    Heat sink
    Pinlist and List of Connections

Additional resources

Schematics (PDF)
Source files and jed file for Configuration Booster CPLD
Eagle Library of the I/O connector
Pin list und die list of connections in Gnumeric or Excel format
IO trace length and impedance

Spartan 6 LX45, LX75 and LX150 USB-FPGA Module 1.15

Block diagram

Block diagram of Spartan 6 LX45, LX75 and LX150 USB-FPGA Module 1.15


  • High-Speed (480 MBit/s) USB interface via Mini-USB connector (B-type)
  • Cypress CY7C68013A EZ-USB FX2 Microcontroller
  • Four Xilinx Spartan 6 FPGA variants: LX45 (XC6SLX45), LX75 (XC6SLX75), LX100 (XC6SLX100) and LX150 (XC6SLX150) FPGA, see Variants
  • 99 General Purpose I/O's (GPIO):
    • 91 FPGA GPIO's
    • 8 EZ-USB FX2 GPIO's
  • 15 special I/O's (SIO):
    • 4 pins for FPGA configuration via JTAG
    • 2 pins for 1 serial ports
    • 2 pins I2C interface (2 pins)
    • 2 interrupt pins
    • 3 timers
    • 1 Wakeup pin
    • 1 Breakpoint pin
  • 128 MByte DDR2 SDRAM:
    • Up to 400 MHz clock frequency
    • 16 Bit bus width
    • Up to 1600 MByte/s data rate
    • Easy to use hard memory controller included Spartan 6 FPGA with 6 ports. (see SDK for examples)
  • MicroSD socket for extensible Flash memory (standard and high capacity (SDHC) cards, SPI mode support required)
    • Bitstream loading from Flash to FPGA supported by the Firmware
    • Accessible from EZ-USB FX2, from FPGA and from Host software using the SDK
  • Fast FPGA configuration using CPLD:
    • Up to 24 MByte/s via USB
    • Up to 2.5 MByte/s from microSD Flash (depends on the speed of the card)
  • Memory mapped IO between EZ-USB FX2 and FPGA
  • 128 Kbit EEPROM memory (can be used to store the EZ-USB firmware)
  • 2 Kbit MAC-EEPROM: contains a unique non erasable MAC-address
  • External power supply required:
  • Heat sink for high performance / high speed applications, see Section heat sink
  • No soldering required: Female pin headers on bottom side (two 2x32 und two 1x23)
  • Temperature range: 0-70°C (-25°C - 85°C on request)
  • FPGA configuration / programming via USB using the EZ-USB FX2 SDK. (No JTAG adapters or other additional utilities required.)
  • FPGA configuration / programming from Flash memory


Variants with different features are offered:

Variant FPGA Speed grade
(larger means faster)
Recommended minimum current
of 1.2V supply
Max. memory clock /
USB-FPGA Module 1.15a XC6SLX45 3 1800 mA 333 MHz / 1333 MByte/s Out of stock,
please switch to
Series 2 FPGA Boards
USB-FPGA Module 1.15b XC6SLX75 3 3000 mA 400 MHz / 1600 MByte/s
USB-FPGA Module 1.15c XC6SLX100 3 4000 mA 400 MHz / 1600 MByte/s
USB-FPGA Module 1.15d XC6SLX150 3 6000 mA 400 MHz / 1600 MByte/s

Other variants (with or without pin headers, other speed grades, extended temperature range) can be produced on request. The LX75 FPGA Board (1.15b) is the largest variant which is supported by the free ISE Webpack version. 1.15c (XC6SLX100) and 1.15d (XC6SLX150) variants require a non-free license or a free 30 day evaluation license.


SDK, Examples, Getting Started

A powerful open source Firmware Development Kit with platform independent host software API is available for the FPGA Board. This SDK allows to define all USB device descriptors using only a few macro commands, and thus gives the developer a quick start into Firmware programming.

The SDK package contains a lot of examples which can be used as starting point for own applications.

More Information are available in the EZ-USB FX2 SDK section.

Additional documentation including Tutorials can also be found on the ZTEX Wiki


Functional description

The following drawing shows the measurements and the location of the of the described elements.

Technical drawing of the Spartan 6 LX45, LX75 and LX150 USB-FPGA Module 1.15
Click on the image for a larger version or download the PDF version.

FPGA configuration

There are three ways to configure the FPGA:
  1. From USB with the SDK. This can be done using the API (see configureFpga) or using the utilities FWLoader or DeviceServer. DeviceServer allows comfortable access to the FPGA Board using the http interface and your Web browser as GUI.
  2. Via JTAG, see JTAG section below. Bitstream upload to large FPGA's (like XC6SLX150) via JTAG may take quite long. Therefore the USB method should be preferred.
  3. From microSD, see the standalone description on the ZTEX Wiki.

EEPROM address: JP1

Jumper JP1 specifies the I2C address of the EEPROM:

JP1 I2C address
open 0xA2
close 0xAA

The EZ-USB FX2 Microcontroller searches for the firmware at the address 0xA2 which is the default address (jumper open).

The main purpose of this jumper is to disable EEPROM boot-loading. If, for example, the EEPROM was programmed with a corrupt firmware the Microcontroller can be booted with the internal firmware by closing JP1 during powering-on the FPGA Board.

JP1 has an unconnected pin which can be used for parking the jumper. The following pictures show all possible jumper positions:

     Spartan 6 LX45, LX75 and LX150 USB-FPGA Module 1.15: JP1 open 1 Spartan 6 LX45, LX75 and LX150 USB-FPGA Module 1.15: JP1 open 2           Spartan 6 LX45, LX75 and LX150 USB-FPGA Module 1.15: JP1 closed     
JP1 open JP1 closed

FPGA state: LED1

LED1 indicates the configuration state of the FPGA as follows:

on unconfigured
off configured


Clock resources

On the FPGA board two clocks sources are connected to the FPGA: the clock output of the EZ-USB FX2 which is usually configured to 48 MHz and the interface clock which can be configured to 30 MHz or to 48 MHz. They can be used to generate new clocks within the FPGA using DCM's or PLL's.

Additional clocks can be connect to the GCLK pins of the I/O connector.

In most cases the on board clock sources are sufficient.


Configuration booster CPLD

The CPLD allows high speed configuration of the FPGA via USB (up to 24 MByte/s) and from Flash (up to 2.5 MByte/s). The CPLD occupies Bits 0 and 3 of port A of the EZ-USB FX2.

For high speed configuration via USB an output Endpoint of the EZ-USB FX2 is required. The Firmware allows to (re-)use an endpoint which is intended for user defined communication. If all Endpoint buffers of the EZ-USB FX2 are required for input Endpoints standard speed (about 1 MByte/s) configuration via Endpoint 0 has to be used.

The FPGA configuration from Flash is done in serial mode at a frequency of 24 MHz. Due to the the sector load latencies the maximum configuration speed in this mode is about 2.5 MByte/s.

The CPLD is factory programmed. Re-programming via JTAG is possible. The sources files and jed file can be downloaded here: usb-fpga-1.15-cpld.zip.


I/O Connector

Two 2x32 pin and two 1x23 pin connectors deliver the I/O signals and are used for the power supply. The drawing shows the position of these connectors.

The I/O connector of the Spartan 6 USB-FPGA Module 1.15 is mechanical downward compatible to the I/O Connector of the USB-FPGA Module 1.11 and USB-FPGA Module 1.2.

There is a polarization key in form of a small hole close to the B1 pin as shown on the drawing. In order to prevent damage equal orientation of the polarization key (hole) of all stacked boards must be ensured.



The FPGA can be configured either via USB or via JTAG. JTAG signals are available at Pins D29 to D32 of the I/O connector. On the Experimental Board and the Power Supply Module JTAG signals are provided at 14 pin Xilinx header.

If the JTAG interface is used for FPGA configuration bit 1 of port A (=PROG_B at FPGA) must be driven high. This happens automatically if a firmware developed with the SDK is running.

The JTAG interface can also be used for re-programming the CPLD.


Heat Sink

For high performance / high speed applications a heat sink is required.

The FPGA boards are delivered with a 18×18×10mm heat sink (XC6SLX45 and XC6SLX75 FPGA boards) or a 25×25×12.5mm (XC6SLX100 and XC6SLX150 FPGA boards) heat sink plus two strong double-sided thermal adhesive pads. In order to prevent damage during the shipping, the heat sinks are delivered unmounted. The recommended mounting and removal procedure is different for the two heat sink variants.

Mounting recommendation for 18×18mm heat sinks (LX45 and LX75 FPGA Boards)

  1. Remove the protective liner from one side of the thermal pad and apply it to the heat sink
  2. If desired: cut off the overhanging edges using a scissor or a sharp knife. (The thermal pad is two 2mm larger than the heat sink.)
  3. Remove the remaining protective liner from thermal pad and position the heat sink on the FPGA with moderate pressure

Mounting instructions for 25×25mm heat sinks (LX100 and LX150 FPGA Boards)

  1. Remove the protective liner from one side of the thermal pad and apply it centrical to the heat sink. Since the thermal pad is 2mm larger than the FPGA it does not need to be positioned exactly.
  2. Remove the protective liner from the other side position the heat sink on the FPGA with moderate pressure. Make sure that enough space is left near the microSD socket and the C5 is not contacted as depicted below.
Spartan 6 XC6SLX100 and XC6SLX100 USB-FPGA Module 1.15 heat sink installation: wrong
Spartan 6 XC6SLX100 and XC6SLX100 USB-FPGA Module 1.15 heat sink installation: o.k.
Spartan 6 XC6SLX100 and XC6SLX100 USB-FPGA Module 1.15 heat sink installation: better

Removal instructions for 18×18mm heat sinks (LX45 and LX75 FPGA Boards)

18×18mm heat sinks can be safely removed by raising up one corner using a thin blade knife.

Removal instructions for 25×25mm heat sinks (LX100 and LX150 FPGA Boards)

Removal of 25×25mm heat sinks is difficult and may cause damage on the board. Never pull up or lever up the heat sink. The safest way to remove the heat sink is by applying shear forces e.g. by twisting the heat sink as depicted below.

Spartan 6 XC6SLX100 and XC6SLX100 USB-FPGA Module 1.15 heat sink removal


Pinlist and List of Connections

The Pinlist of the I/O Connector and the List of Connections can be downloaded in Gnumeric or Excel format. These files contain the data for all USB-FPGA Boards including compatibility information. (Attention: The files contain several sheets.)

This is the Pinlist of the I/O Connector:

1 4..35V 4..35V USB_5V USB_5V 1
2 GND GND 5V (unused) 5V (unused) 2
3 INT4 T0 L20~IO_L43P_GCLK5_M1DQ4_1 5V (unused) 3
4 T1 T2 GND GND 4
6 SCL SDA 3.3V 3.3V 6
7 3.3V 3.3V 7
8 TxD0 RxD0 GND V20~IO_L71N_1 8
9 A20~IO_L16N_1 A19~IO_L16P_1 PE7/GPIFADR8 Y22~IO_L59N_1 9
10 1.2V 2.5V 2.5V PE6/T2EX AA22~IO_L63N_1 AA21~IO_L63P_1 10
11 1.2V 1.2V 1.2V PE5/INT6 Y21~IO_L59P_1 AB21~IO_L61N_1 11
12 VREF A18~IO_L66N_SCP0_0 B18~IO_L66P_SCP1_0 PE4/RXD1OUT W20~IO_L53P_1 Y20~IO_L67N_1 12
13 C16~IO_L65N_SCP2_0 D17~IO_L65P_SCP3_0 GND PE3/RXD0OUT AA20~IO_L61P_1 AB20~IO_L65N_1 13
14 B16~IO_L63P_SCP7_0 A17~IO_L64N_SCP4_0 C17~IO_L64P_SCP5_0 PE2/T2OUT V19~IO_L71P_1 AB19~IO_L65P_1 14
15 A16~IO_L63N_SCP6_0 C14~IO_L46N_0 D15~IO_L46P_0 PE1/T1OUT Y19~IO_L67P_1 AB18~IO_L2N_CMPMOSI_2 15
16 B12~IO_L36P_GCLK15_0 3.3V 3.3V PE0/T0OUT V18~IO_L73N_1 AA18~IO_L2P_CMPCLK_2 16
17 A12~IO_L36N_GCLK14_0 A11~IO_L35N_GCLK16_0 C11~IO_L35P_GCLK17_0 GND Y15~IO_L5P_2 AA16~IO_L4P_2 17
18 B14~IO_L50P_0 C13~IO_L48P_0 A13~IO_L48N_0 2.5V 2.5V AB15~IO_L5N_2 18
19 A14~IO_L50N_0 C12~IO_L37N_GCLK12_0 D11~IO_L37P_GCLK13_0 1.2V V15~IO_L13N_D10_2 W14~IO_L16P_2 19
20 D12~IO_L47N_0_NC45 C15~IO_L62P_0 F10~IO_L38P_0 Y11~IO_L31P_GCLK31_D14_2 W15~IO_L14P_D11_2 Y16~IO_L14N_D12_2 20
21 D13~IO_L47P_0_NC45 GND GND AA12~IO_L30P_GCLK1_D13_2 AA14~IO_L15P_2 AB14~IO_L15N_2 21
22 A10~IO_L34N_GCLK18_0 VCCO_IO VCCO_IO Y10~IO_L29N_GCLK2_2 AB12~IO_L30N_GCLK0_USERCCLK_2 AB11~IO_L31N_GCLK30_D15_2 22
23 B10~IO_L34P_GCLK19_0 1.2V 1.2V AB10~IO_L32N_GCLK28_2 AA10~IO_L32P_GCLK29_2 W11~IO_L29P_GCLK3_2 23
24 C9~IO_L8P_0 C10~IO_L33N_0 D10~IO_L33P_0 Y13~IO_L41P_2 T14~IO_L20P_2 U14~IO_L20N_2 24
25 C7~IO_L5P_0 D8~IO_L32N_0 D9~IO_L32P_0 W9~IO_L47P_2 W12~IO_L42P_2 Y12~IO_L42N_2 25
26 A7~IO_L5N_0 A8~IO_L6N_0 B8~IO_L6P_0 GND GND VREF 26
27 B6~IO_L4P_0 C8~IO_L7N_0 D7~IO_L7P_0 Y8~IO_L47N_2 27
28 VREF C6~IO_L3N_0 D6~IO_L3P_0 1.2V 1.2V AB7~IO_L63N_2 28
29 3.3V A5~IO_L2N_0 C5~IO_L2P_0 2.5V TDI Y7~IO_L63P_2 29
30 3.3V B3~IO_L1P_HSWAPEN_0 A6~IO_L4N_0 TMS AB6~IO_L64N_D9_2 30

Serial 2   FX2-IO 8
I2C 2   Wakeup 1
Timer 3   JTAG 4
Interrupt 1   Interrupt 1
Breakpoint 1   USB 5V 2
GND 10   GND 7
3.3V 6   3.3V 2
1.2V 6   1.2V 3
2.5V 2   2.5V 3
VREF_IO 2   VREF_3.3 2
VCCO_IO 4   5V 3
4..35V 2   NC 6
SIO (special I/O) 9   FX2-GPIO 8
Power 32   SIO (special I/O) 6
  Power 22
  NC 6
Sum 87   Sum 87



Click on the images for larger versions.

Spartan 6 LX45, LX75 and LX150 USB-FPGA Module 1.15

USB-FPGA Module 1.15d with Spartan 6 LX150 (XC6SLX150). Also available with LX45 (1.15a, XC6SLX45), LX75 (1.15b, XC6SLX75) and LX100 (1.15d, XC6SLX100)

Spartan 6 XC6SLX45 and XC6SLX75 USB-FPGA Module 1.15 with 18mm heat sink

USB-FPGA Module 1.15 with 18×18mm heat sink. These heat sinks are delivered with the LX45 (1.15a, XC6SLX45) and LX75 (1.15b XC6SLX75) variants of the FPGA Board.

Spartan 6 XC6SLX100 and XC6SLX150 USB-FPGA Module 1.15 with 25mm heat sink

USB-FPGA Module 1.15 with 25×25mm heat sink. These heat sinks are delivered with the LX100 (1.15c, XC6SLX100) and LX150 (1.15d, XC6SLX150) variants of the FPGA Board.

Size comparison of Spartan 6 LX45, LX75 and LX150 USB-FPGA Module 1.15

Size comparison of the Spartan 6 USB-FPGA Module 1.15. These FPGA Boards are available in four variants: 1.15a (LX45 / XC6SLX45), 1.15b (LX75 / XC6SLX75), 1.15c (LX100 / XC6SLX100) und 1.15d (LX150 / XC6SLX150).

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