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Motherboard Layout and Routing Guidelines
2-24
Intel
®
440GX AGPset Design Guide
2.9.1.3 Trace Width vs. Trace Spacing
To minimize the crosstalk, a 1:2 trace width vs. trace spacing routing (e.g., 6 mils on 9 mils or 5
mils on 10 mils) should be used for all memory interface signals.
2.9.2 Memory Layout & Routing Guidelines
Layout Guidelines: All signals require careful routing for both min and max trace lengths
Figure 2-18. Matching the Reference Planes and Adding Decoupling Capacitor
Figure 2-19. 4 DIMMs (Single or Double-Sided)
CS_A[7:6]#,CS_B[7:6]#
CS_A[5:4]#,CS_B[5:4]#
CS_A[3:2]#,CS_B[3:2]#
CS_A[1:0]#,CS_B[1:0]#
SMB_CLK
SMB_DATA
DIMM_CLK[3:0]
DIMM_CLK[7:4]
DIMM_CLK[11:8]
DIMM_CLK[15:12]
SRAS_A#
SRAS_B#
SCAS_A#
SCAS_B#
WE_A#
WE_B#
DQM_B[1,5]
MAA[14:0]
MAB[12, 11, 9:0]#, MAB[14, 13,10]
MECC[7:0]
MD[63:0]
DQM_A[1,5]
DQM_A[7,6,4:2,0]
~ 16212
~ 16212
FENA
Group 0 Group 1