Transcript ddr3 sdram
Memory Sephiroth Kwon GRMA 26-05-2009 Outline • • • • • Introduction DDR II DDR III Repair Flow Chart Repair Technique Introduction Memory Module North Bridge Type 1 Main Clock Gen. Memory Module North Bridge CPU Type 2 Main Clock Gen. DDR II DDR2 • DDR2 SDRAM (Double Data Rate Two Synchronous Dynamic Random Access Memory) • DDR2 modules use a 1.8V power supply • DDR2 has 240 pins DDR2 DDR3 • DDR3 SDRAM(Double Data Rate Three Synchronous Dynamic Random Access Memory) • DDR3 SDRAM improves on DDR2 SDRAM in several significant ways: – Higher bandwidth due to increased clock rate – Reduced power consumption due to 90nm fabrication technology – Pre-fetch buffer is doubled to 8 bits to further increase performance – The voltage of DDR3 SDRAM DIMM's was lowered from 1.8V to 1.5V. This reduces power consumption and heat generation, as well as enabling more dense memory configurations for higher capacities. DDR3 Repair Flow Chart START Visual Inspection check memory slot is no bent pin or damaged. NG NG Check memory Voltage 1.5V (1.8 or 3V) dual & Vtt NG Check memory CLK 100/133/166..Mhz OK Measure memory DQ / Address,RAS#,CAS#,WE# OK Change NB Finished Fix any voltage regulator or small inductor../trace open OK NG OK Measure memory Clock OK NG OK Measure memory Voltage Change any damaged memory slot Fix any trace or RLC damaged, change NG CLK Generator OK NG NG Compare with good MB, trace NG signal Fix any trace open or resistor damaged NG OK Repair Technique-Visual Inspection Visual Inspection to check memory slot is not damaged or bent pin inside. 1 Repair Technique-Measure Memory Voltage Use Multi-Meter or Oscilloscope to measure Memory Voltage. 2-1 Memory Voltage: DDR2: 1.8 Dual, 0.8Vtt_DDR DDR3: 1.5 Dual, 2-2 Repair Technique-Measure Memory Clock Use Oscilloscope to measure Memory Clock (100Mhz or 133Mhz, 166Mhz…depends on different chipset & memory) 3-1 3-2 Repair Technique-Measure Memory Signals Plug Memory measure card into slot. Use Multi-Meter to measure memory signals’ bias voltage value. Compare with good MB if you find any unusual. 4-1 Thank You!