Intel 855Pm Mch Ddr Signal Package Lengths; Table 35. Intel 855Pm Chipset Ddr Signal Package Lengths - Intel 855PM Design Manual

System Memory Design Guidelines (DDR-SDRAM)
6.2.

Intel 855PM MCH DDR Signal Package Lengths

The signals listed in Table 35 are routed with 55
the same group are trace length matched within 0.1 mils inside the package. Thus, motherboard routing
does not need to compensate for trace length mismatch in the package for these signals.

Table 35. Intel 855PM Chipset DDR Signal Package Lengths

Data Signal Name
SDQ[7:0]
SDQS[0]
SDQ[15:8]
SDQS[1]
SDQ[23:16]
SDQS[2]
SDQ[31:24]
SDQS[3]
SDQ[39:32]
SDQS[4]
SCK[5:0]
SMA[0]
SMA[1]
SMA[2]
SMA[3]
SMA[4]
SMA[5]
SMA[6]
SBS[0]
160
Intel 855PM MCH Package
Trace Length (mils)
DATA GROUP 1
945
945
DATA GROUP 2
873
873
DATA GROUP 3
765
765
DATA GROUP 4
658
658
DATA GROUP 5
649
649
DIFFERENIAL CLOCKS
661
COMMAND – SMA
462
441
481
537
434
548
510
COMMAND – SBS
423
± 15% micro-strip transmission lines. Signals within
Intel 855PM MCH Package
Data Signal Name
Trace Length (mils)
DATA GROUP 6
SDQ[47:40]
SDQS[5]
DATA GROUP 7
SDQ[55:48]
SDQS[6]
DATA GROUP 8
SDQ[63:56]
SDQS[7]
DATA GROUP 9
SDQ[71:64]
SDQS[8]
SCK[5:0]#
SMA[7]
SMA[8]
SMA[9]
SMA[10]
SMA[11]
SMA[12]
SBS[1]
®
Intel 855PM Chipset Platform Design Guide
R
732
732
850
850
950
950
646
646
661
515
446
523
404
536
538
398