- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
I make a mistake when I do the schmatics work, so I must use a normal pin as DDR2 controller's DQ.
When I complie the project, I face the error: altmemphy pin placement unsuccessful.The assigned location PIN C20 for DQ pin "DDR_DQ[6]" is not a legal location. The DDR2 controller is generated by the QuartusII. Can I fix the error by doing some setting of QuartusII? Or I must re-layout the PCB? Thank you!Link Copied
5 Replies
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
The DDR2 controller is required to use DQ/DQS groups according to the assignments in device pinout files. Unfortunately you have to change the layout.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Stratix family? If you look through the handbook, the hardware has specially structures on the DQS ports that are used by the PHY. If it used "generic" FPGA structures, it would never meet timing.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
--- Quote Start --- Stratix family? If you look through the handbook, the hardware has specially structures on the DQS ports that are used by the PHY. If it used "generic" FPGA structures, it would never meet timing. --- Quote End --- Not quite, in Cyclone II, III or IV timing is met using the "generic" fabric. Maximum speed is of course lower than for Stratix with the DDR registers built in to the IO-ring.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
I'm not quite sure, which specific hardware resources are provided for dedicated DQ and DQS pins in Cyclone devices. But they use specific pins, which was the question of the original poster.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Thank you everyone! I use Cyclone III in this project.I will check the handbook of Cyclone III.
Reply
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page