04-07-2011 05:28 AM
In UG388 Spartan-6 FPGA Memory Controller User Guide Table 3-1 "Supported Memory Devices for the MCB" list, I checked the DDR2 and DDR3 devices with 16 bit datawidth, but all of the Micron and Elpida devices are "EOL pending" or "Obsolete". Is there an updated version of this list?
Thanks in advance
04-07-2011 06:09 AM - edited 04-07-2011 06:14 AM
1. Use the drop-down menu in MIG wizard, not the UG388 list. MIG is the current code. UG388 is not updated every time MIG is updated, unless MIG adds some features (or something).
In MIG 3.61 (shipped with ISE 12.4), there are 3 speed grades of Micron 1Gb 1.8V 64M x 16 devices in the dropdown list.
2. All the DRAM manufacturers are constantly churning their products (replacing them with newer die versions). In almost all cases, the newer die revision is a drop-in replacement for the previous die revisions. Die revisions which cause incompatibilities with existing memory controller designs would be disastrous for the DRAM manufacturer, as it would drive customers away in droves to the competition.
The current revision of UG388 is 2.3, dated August 9 2010 -- 8 months old as this post is being written. Looking at Table 3-1, it's a deeply flawed list.
NOTE to XILINX: If you aren't going to keep the list of supported DRAM devices in UG388 up to date, you should delete the list from the document. It would be better to provide a link to a list of DRAM devices expressly supported in each revision of MIG. Updating this list would be part of the MIG software release process.
Summary: Run MIG, and check the list of parts available in MIG. Don't be discouraged by the parts list in UG388.
-- Bob Elkind
04-22-2012 10:57 PM
I am using DDR3 device in my design (Spartan6-LX75).
If i check in MIG tool only speed grade- 187E& 15E devices are supported.
Does this signify that if any other speed grade device is used in design, Spartan-6 will not support (by Xilinx core)?
Please help me in underestanding this issue.
04-23-2012 05:03 AM
1. Please do not raise an unrelated subject to an existing thread. This is considered rude. Please review the comments and exhortations in the SIGNATURE appended to this post.
2. There is no risk in using a faster DRAM in place of a slower DRAM.
-- Bob Elkind