Design Guide

System Memory Design Guidelines (DDR-SDRAM) for Memory Down Configuration
R
Intel
®
855GM/855GME Chipset Platform Design Guide 137
7.3.4.5. SDQ/SDQS Signal Package Lengths
The package length data in Table 48 below should be used to tune the length of each SDQ, SDM, and
SDQS motherboard trace as required to achieve the overall length matching requirements defined in the
prior Sections.
Table 48. DDR SDQ/SDM/SDQS Package Lengths
Signal Pin Number Pkg Length (mils) Signal Pin Number Pkg Length (mils)
SDQ_00 AF2 785 SDQ_32 AH16 766
SDQ_01 AE3 751 SDQ_33 AG17 558
SDQ_02 AF4 690 SDQ_34 AF19 510
SDQ_03 AH2 903 SDQ_35 AE20 579
SDQ_04 AD3 682 SDQ_36 AD18 408
SDQ_05 AE2 739 SDQ_37 AE18 458
SDQ_06 AG4 741 SDQ_38 AH18 658
SDQ_07 AH3 845 SDQ_39 AG19 596
SDQ_08 AD6 607 SDQ_40 AH20 677
SDQ_09 AG5 756 SDQ_41 AG20 730
SDQ_10 AG7 685 SDQ_42 AF22 562
SDQ_11 AE8 558 SDQ_43 AH22 702
SDQ_12 AF5 734 SDQ_44 AF20 563
SDQ_13 AH4 825 SDQ_45 AH19 644
SDQ_14 AF7 644 SDQ_46 AH21 716
SDQ_15 AH6 912 SDQ_47 AG22 783
SDQ_16 AF8 622 SDQ_48 AE23 592
SDQ_17 AG8 624 SDQ_49 AH23 752
SDQ_18 AH9 676 SDQ_50 AE24 666
SDQ_19 AG10 634 SDQ_51 AH25 817
SDQ_20 AH7 710 SDQ_52 AG23 639
SDQ_21 AD9 508 SDQ_53 AF23 667
SDQ_22 AF10 569 SDQ_54 AF25 707
SDQ_23 AE11 469 SDQ_55 AG25 783
SDQ_24 AH10 648 SDQ_56 AH26 834
SDQ_25 AH11 622 SDQ_57 AE26 701
SDQ_26 AG13 572 SDQ_58 AG28 808