Clock Package Length Table; Table 19. Memory Clock Package Lengths - Intel 852GME Design Manual

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6.3.1.5.

Clock Package Length Table

The package length data in the table below should be used to tune the motherboard length of each
SCK/SCK# clock pair between the GMCH/MCH and the associated SO-DIMM socket. It is
recommended that die-pad to SO-DIMM pin length be tuned to within ± 25 mils in order to optimize
timing margins on the interface.

Table 19. Memory Clock Package Lengths

Signal
SCK_0
SCK#_0
SCK_1
SCK#_1
SCK_2
SCK#_2
SCK_3
SCK#_3
SCK_4
SCK#_4
SCK_5
SCK#_5
Package length compensation can be performed on each individual clock output thereby matching total
length on SCK/SCK# exactly, or alternatively the average package length can be used for both outputs
of a pair and length tuning done with respect to the motherboard portion only.
® ®
Intel 852GME, Intel 852GMV and Intel
System Memory Design Guidelines (DDR-SDRAM)
Package Length
Pin Number
(mils)
AB2 1177
AA2 1169
AC26
AB25
AC3 1129
AD4 1107
AC2 1299
AD2 1305
AB23
AB24
AA3 1128
AB4 1146
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852PM Chipset Platforms Design Guide
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838
643
656
71