Intel 925 Data Sheet - Page 188

Electrical Characteristics R Signal Group Signal Type Signals DDR2 Interface Signal Groups (k) SSTL - 1.8 DDR2 CMOS I/O SDQ_A[63:0]#, SDQ_B[63:0]#, SDQS_A[7:0], SDQS_A[7:0]#, SDQS_B[7:0]#, SDQS_B[7:0]#, SDQS_A82, SDQS_A8#2, SDQS_B82, SDQS_B8#2, SCB_A[7:0] 2, SCB_B[7:0] 2 (l) SSTL - 1.8 DDR2 CMOS Output SDM_A[7:0], SDM_B[7:0], SMA[13:0], SMA_B[13:0] SBS_A[2:0], SBS_B[2:0] SRAS_A#, SRAS_B#, SCAS_A#, SCAS_B#, SWE_A#, SWE_B#, SODT_A[3:0], SODT_B[3:0], SCKE_A[3:0], SCKE_B[3:0], SCS_A[3:0]#, SCS_B[3:0]#, SCLK_A[5:0], SCLK_A[5:0]#, SCLK_B[5:0], SCLK_B[5:0]# (m) DDR2 Reference Voltage SMVREF[1:0] (DDR2) Clocks, Reset, and Miscellaneous Signal Groups (n) HVCMOS Input (n1) Miscellaneous Inputs (0) Low Voltage Diff. Clock Input (p) HVCMOS I/O I/O Buffer Supply Voltages EXTTS# RSTIN#, PWROK HCLKN, HCLKP, DREFCLKP, DREFCLKN, GCLKP, GCLKN DDC_CLK, DDC_DATA (q) 1.2 V System Bus Input VTT Supply Voltage (r) 1.5 V PCI Express Supply Voltages VCC_EXP (t) 1.8 V DDR2 Supply Voltage VCCSM (DDR2) (v) 1.5 V DDR2 PLL Analog VCCA_SMPLL (DDR2) Supply Voltage (w) 1.5 V MCH Core Supply VCC Voltage (x) 2.5 V CMOS Supply Voltage VCC2 (z) PLL Analog Supply Voltages VCCA_HPLL, VCCA_EXPPLL NOTES: 1. DDR2 533 with CAS timing of 3-3-3 operate at 1.9 V. 2. 82925X MCH signal only. Notes 1 1 1 188 Intel® 82925X/82925XE MCH Datasheet