The new Spartan-3 data sheet (Mod 1) mentions a new supported IOSTANDARD for Spartan-3 (SSTL18_II). What version of the design tools supports this I/O standard? Is it supported in Spartan-3E?
The Spartan-3 data sheet is located at:
SSTL18_II will be supported for Spartan-3 devices in the 7.1 Service Pack 1, available at:
The first service pack containing the fix is 7.1i Service Pack 1.
SSTL18_II is not supported for Spartan-3E devices.