t26a_readme.txt

ddr sdram 的控制代码

T26A IBIS Model (Die Rev F)
256Mb DDR1 SDRAM IBIS models

              Rev 1.0: 03/24/2003          
                  - initial file creation
              Rev 2.0: 06/02/2004          
                  - removed x4 and x8 packages from the model
                  - all models matched to latest silicon measurements
                  - typ temperature changed from 25C to 40C
                  - C_comp values updated for all models
                  - added Vinl and Vinh corners to all models
              Rev 2.1: 03/14/2007
                  - updated all models to current design revision 
                  - updated IBIS version to 4.0
                  - models for 266/333/400 Mbps included in the same file
                  - updated c_comp for Input, Input2 and Clock models
                  - added overshoot/undershoot parameters


IBIS file t26a.ibs has models for 266, 333, 400 speed grades included, selected through [Model Selector]. 
Models *_333 are applicable for speed grade 266/333 Mbps and models *_400 are 
applicable for speed grade 400 Mbps.


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