Building designs for Virtex-II engineering samples
At the time of writing, Alpha Data suggests the following guidelines for users wishing to implement a design for a Virtex-II ES device:
- The environment variable XIL_BITGEN_VIRTEX2ES must be set to 1 when running bitgen.exe for a Virtex-II ES device. Note that a bitstream generated for a Virtex-II ES device is compatible with a Virtex-II production device.
- Use of Xilinx Foundation 4.1i+SP3 or later is strongly recommended when building bitstreams for Virtex-II ES devices. If Xilinx Foundation 4.1i+SP2 or earlier is used to generate a bitstream using DCMs for a Virtex-II ES device, Alpha Data cannot guarantee that a correctly working bitstream will be generated.
- Xilinx Foundation 3.1i+SP8, 4.1i, 4.1i+SP1 or 4.1i+SP2 may safely be used to implement Virtex-II ES designs that do not use DCMs.
- A patch, available from the Xilinx website, must be applied to Xilinx Foundation 3.1i+SP8 in order for bitgen.exe to recognise the XIL_BITGEN_VIRTEX2ES environment variable.
Customers who require help implementing a design for a Virtex-II ES device should contact Alpha Data support.