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Evaluation board

Soldering Conditions

 

 

Q1:What is the standard packages of SDRAM.

A1:
     1.SDRAM
        (1)16M (1M*16)SDRAM: TSOP-50  
        (2) (*16/*8/*4) SDRAM: TSOP-54 / BGA-54
        (3) (*32) SDRAM: TSOP-86 
     2.DDR SDRAM  
        (1)(*8/*4) DDR2 : BGA- 60  
        (2)(*16) DDR2 : BGA- 84
        (3)(*8/*4) DDR3 : BGA- 94(78+16)/ 86(78+8)
        (4)(*16) DDR3 : BGA- 112(96+16)/ 96(96+0)
     3.Mobile SDRAM
        (1)(*16) MSDR : BGA-54
        (2)(*32) MSDR : BGA-90
     4.Mobile DDR SDRAM
        (1)(*16) MDDR : BGA-60 
        (2)(*32) MDDR : BGA-90 
     5.BGA-90Graphic SDRAM
        (1)(*32) GSDR : TQFP-100 
     6.Graphic DDR SDRAM
        (1)(*16) GDDR1: TSOP-66 
        (2)(*32) GDDR1: TQFP-100 / FBGA-144 
        (3)(*16) GDDR2: FBGA-84
        (4)(*32) GDDR3: FBGA-136 
        (5)(*32) GDDR4: FBGA-136


Q2:What is the standard pin assignment of SDRAM.

A2:Almost all SDRAM maker follow same rule.
      you can also reference on all datasheet.


Q3:What is the meanings of speed code;does all Dram maker follow same rule ?
A3:

     
About speed code ,most of the SDRAM makers follow clock rate (Tck):
      for example: Micron /Qimonda /Nanya /Elpida /ProMOS /Eorex...

      - 10 for SDR-100(Tck=100Mhz)
      - 7.5 for SDR-133(Tck=133Mhz) CL3
      - 6 for SDR-166(Tck=166Mhz) CL3
      - 5 for SDR-200(Tck=200Mhz) CL3

      - 7.5 for DDR1-266(Tck=133Mhz) CL2
      - 6 for DDR1-333(Tck=166Mhz) CL2.5
      - 5 for DDR1-400(Tck=200Mhz) CL3

      - 5 for DDR2-400(Tck=200Mhz) 3-3-3 (CL-Trcd-Trp)
      - 3.7 for DDR2-533(Tck=266Mhz) 4-4-4 (CL-Trcd-Trp)
      - 3 for DDR2-667(Tck=333Mhz) 5-5-5 (CL-Trcd-Trp)
      - 2.5 for DDR2-800(Tck=400Mhz) 6-6-6 (CL-Trcd-Trp)

      but some company's speed code was represented data rate ( 1/2*Tck for DDR )
      for example:
      - 3 for DDR1-333(Tck=166Mhz) CL2.5

      And all information can be seen in their datasheet.
 

 

 

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