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Zefant-LC3E Users ManualFrom $1Table of contents
IntroductionThe "Zefant LC3E" modules are low cost, yet versatile and easy to use FPGA modules. They offer most of the advantages of the larger Zefant modules, but can be plugged directly into standard breadboard PCBs, no high density connectors are required. Additionally they are particularly economically priced.They are based on Xilinx Spartan-3E FPGAs with 100,000 or 250,000 system gates and do also include power supply, SRAM and flash memory. Hardware DescriptionThe FPGA module contains the FPGA itself, SRAM, Intel StrataFlash, one or two oscillators, multiple power supplies, misc switches, buttons and LEDs, 3 board-to-board connectors and a JTAG connector:
Additionally a secure EEPROM (IC1001) can optionally be occupied and used as explained in Xilinx XAPP780 for copy protection. The top side of the module looks like this:
The BTB connectors can be occupied on the bottom side (as shown on the photo), on the top side or not at all. JTAG ChainThe JTAG chain only contains the Spartan-3E FPGA on this module, therefore it looks very simple: Solder BridgesSolder Bridge DescriptionsThe module contains 5 solder bridges in total, all of which are located on the bottom PCB side. For simplicity they're also documented on the PCB:
For identification pad #1 is larger than pad #2. Default Solder Bridge SettingsBy default the solder bridges are set as shown below. Both oscillators are enabled, all I/O banks and VCC33 are supplied internally:
OscillatorsA total of 2 oscillators can be occupied on the module:
BTB ConnectorsThe Board-to-Board connectors are standard 2.54mm headers:
* actually the connectors can be occupied from either side. However the default side is relevant for the pin numbering. So note that X803 is differently numbered from the other 2 connectors! SignalsShort notes for special or dedicated signals:
Bank I/O VoltagesThe Spartan-3E has 3 I/O banks, each of which can be supplied with an I/O voltage. Banks 1 and 2 are fixed to 3.3V, banks 0 and 3 can be supplied externally from the BTB connectors or be connected to VCC33 as well through solder bridges SB301 and SB302.
Mechanical DimensionsThe major dimensions of the module are 100 x 58mm.
Technical Data
(*) The shared external I/Os can either be used as a memory bus (together with the SRAM and Flash) or as free I/Os (if RAM/Flash are disabled). Software and ResourcesLinksAll resources and software downloads for the Zefant-LC3E can be downloaded from the subversion repository. You can access the repository here:
* like Tortoise for example. Repository HierarchyThe most important directories of the repository will be mentioned in this incomplete list. It will pay out to browse the repository by yourself!
Additional Files in external Repositories
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