Ddr3/ddr4 ram section voltage requirements(working)

[stingerchamp]

Follow this guide to verify voltage at RAM SECTION


DDR 3 ram section voltage check list at ram slot

DDR3 operating voltage VDD (at coil )= 1.5V PINs 75,76 ram slot

VRef_DQ = 0.75 V at PIN 1
VTT/Termination voltage= 0.75V PINs 203,204

VRef_CA. = 0.75V PIN 126
VDD SPD = 3.3V PIN 199
SDA data = 3.3V PIN 200
SCL clock = 3.3V PIN 202
DRAM_RST# = 1.5V PIN 30

±+++++++++++++++++++++++

DDR 3L ram section voltage check list at ram slot

DDR3L operating voltage VDD (at coil )= 1.35V PINs 75,76 ram slot

VRef_DQ = 0.67 V at PIN 1
VTT/Termination voltage= 0.67V PINs 203,204

VRef_CA. = 0.67V PIN 126
VDD SPD = 3.3V PIN 199
SDA data = 3.3V PIN 200
SCL clock = 3.3V PIN 202
DRAM_RST# = 1.35V PIN 30



±+++++++++++++++++++++++++++++


DDR4 ram section voltage check list at ram slot

DDR4 operating voltage VDD (at coil )= 1.2V PINs 12,33,75 of ram slot

VTT/Termination voltage= 0.5V PIN 258

VRef_CA. = 0.5V PIN 164
VDD SPD = 3.3V PIN 255
SDA data = 3.3V PIN 254
SCL clock = 3.3V PIN 253
DRAM_RST# = 1.2V PIN 108


In case of any mistake please notify

Thanks

[piernov]

Re: Ddr3/ddr4 ram section voltage requirements(working)

VTT is half VDDQ, for DDR3L VDDQ = 1.35V so VTT = 0.675V, and for DDR4 VDDQ=1.2V so VTT=0.6V.

[stingerchamp]

Re: Ddr3/ddr4 ram section voltage requirements(working)

Oh my mistake yes I knew it is half but wrote 0.5 lol

Anyhow thanks

Correction DDR4 :0.6 not 0.5
Ddr3l is ok 0.67 in general

[mcplslg123]

Re: Ddr3/ddr4 ram section voltage requirements(working)

Will help a lot of beginners.

[stingerchamp]

Re: Ddr3/ddr4 ram section voltage requirements(working)

I have to search it every time

Can we fix this thread

[kuchodjalex]

Follow this guide to verify voltage at RAM SECTION


DDR 3 ram section voltage check list at ram slot

DDR3 operating voltage VDD (at coil )= 1.5V PINs 75,76 ram slot

VRef_DQ = 0.75 V at PIN 1
VTT/Termination voltage= 0.75V PINs 203,204

VRef_CA. = 0.75V PIN 126
VDD SPD = 3.3V PIN 199
SDA data = 3.3V PIN 200
SCL clock = 3.3V PIN 202
DRAM_RST# = 1.5V PIN 30

±+++++++++++++++++++++++

DDR 3L ram section voltage check list at ram slot

DDR3L operating voltage VDD (at coil )= 1.35V PINs 75,76 ram slot

VRef_DQ = 0.67 V at PIN 1
VTT/Termination voltage= 0.67V PINs 203,204

VRef_CA. = 0.67V PIN 126
VDD SPD = 3.3V PIN 199
SDA data = 3.3V PIN 200
SCL clock = 3.3V PIN 202
DRAM_RST# = 1.35V PIN 30



±+++++++++++++++++++++++++++++


DDR4 ram section voltage check list at ram slot

DDR4 operating voltage VDD (at coil )= 1.2V PINs 12,33,75 of ram slot

VTT/Termination voltage= 0.5V PIN 258

VRef_CA. = 0.5V PIN 164
VDD SPD = 3.3V PIN 255
SDA data = 3.3V PIN 254
SCL clock = 3.3V PIN 253
DRAM_RST# = 1.2V PIN 108


In case of any mistake please notify

Thanks

HI, very useful information that you put here, BUT, you have mistake pin number for VREF_CA on DDR4. Is pin 146 VREF_CA, and you write pin 164.
Hope you can correct this for use of others in this great forum. The info itself is very very useful. thanks a lot for that.

[jonny0404]

VRef_CA is pin 146 not 164 friend.

[jonny0404]

254 pin is ground ,SDA data = 3.3V Pin :285 and SCL clock = 3.3V PIN 141 not 253