AR# 36364

描述

解决方案

The Spartan-6 LX and LXT devices with -3N speed gradedo not have the Memory Controller Block (MCB) support. The -3N speed files are independent and different than the -3 speed files, so all timing analysis must be done completely for the targeted device. See the Switching Characteristics section of the Spartan-6 FPGA Data Sheet(DS162) for the speed file numbers.

Software Support

In the ISE12.3 software, there isa -3N speed grade available to pick for the target device.

Software versions prior to the ISE 12.3 softwaredo not have a -3N speed grade available to use.Instead, target the -3 speed grade and do not use the Memory Controller Block.The generated bitstream created will still work correctly in the -3N speed grade devices.However, beginning in ISE tools 12.4, the -3 and -3N speed grades are no longer identical, so the -3N devices must beselected in the software if they are being targeted by the design.

Other Notes

• Do not usethe Memory Interface Generator (MIG) or the Multi Port Memory Controller (MPMC) through EDK for any -3N speed grade parts. When targeting a -3N speed grade part in the ISE 12.3 software and later, the DRC will error out if an MCB is used in the design.
• -3N is marked "N3C" or"N3I", with the "C" or "I" designating temperature rating.
• -3N will apply to all devices except those that do not support MCBs in the standard -3 speed grade: LX4 device, TQG144 package, and CPG196 package.
• There are no, and will not be any, -2N devices.

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