flynnjs Posted November 3, 2014 Share Posted November 3, 2014 Hi, I've just received two of these, both marked on the silk screen as Rev F. I was looking at the Rev E.0 schematic which seems to show the DDR3 device, IC23, as a MT41K512M8RH (a 1.35v DDR3L device) being fed from IC36, a 1.5v power supply. I checked my board and the memory IC23 is marked "D9QBJ" which according to the Micron website agrees with the part shown on the schematic, is an "RH" 1.35v device. I also checked the voltage test point next to IC36 and that rail is definitely 1.5v. I think there is a problem that the supply to this memory is above the above the maximum operating voltage in table 21 of the Micron datasheet. I would appreciate it if someone from Digilent could comment please. regards, Jason Link to comment Share on other sites More sharing options...
flynnjs Posted November 3, 2014 Author Share Posted November 3, 2014 Looking at the data sheet further, it says the device can be run in 1.5v compatibility mode and therefore shouldn't be a problem. Sorry for my own misunderstanding. Link to comment Share on other sites More sharing options...
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flynnjs
Hi,
I've just received two of these, both marked on the silk screen as Rev F.
I was looking at the Rev E.0 schematic which seems to show the DDR3 device,
IC23, as a MT41K512M8RH (a 1.35v DDR3L device) being fed from IC36, a
1.5v power supply.
I checked my board and the memory IC23 is marked "D9QBJ" which according
to the Micron website agrees with the part shown on the schematic, is an "RH"
1.35v device.
I also checked the voltage test point next to IC36 and that rail is definitely 1.5v.
I think there is a problem that the supply to this memory is above the above the
maximum operating voltage in table 21 of the Micron datasheet.
I would appreciate it if someone from Digilent could comment please.
regards,
Jason
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