Author Topic: Please help identify these memory chips (DDR2?3)  (Read 1091 times)

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Offline YansiTopic starter

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Please help identify these memory chips (DDR2?3)
« on: January 07, 2020, 12:38:54 am »
Hello,

out of curiosity I've done a small teardown of a bit of professional video gizmo, to get an idea how stuff got done in there.

The main brain is a Cyclone III FPGA,  using three memory chips. I'd like to know what type they likely are (to estimate the bus throughput they may have). Please find below a photo of the main PCB.

I guess these may be either DDR2 or DDR3. But I've failed miserably trying to google the cryptic alphanumeric codes on the chips. Manufacturer is likely a Micron.

Thanks for any hints

//EDIT: Cyclone III seems to support only DDR2, so DDR3 they are not. Still I'd like to know what the bus width and capacity of these may be.
« Last Edit: January 07, 2020, 12:42:47 am by Yansi »
 

Offline BravoV

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Re: Please help identify these memory chips (DDR2?3)
« Reply #1 on: January 07, 2020, 12:55:10 am »
The legendary Micron D9 series ... DDR2.

Offline YansiTopic starter

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Re: Please help identify these memory chips (DDR2?3)
« Reply #2 on: January 07, 2020, 12:58:24 am »
Why legendary?
 

Offline BravoV

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Re: Please help identify these memory chips (DDR2?3)
« Reply #3 on: January 07, 2020, 12:59:33 am »
Why legendary?

In PC overclocking's scene back in the days of DDR2 RAM.

Offline BravoV

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Re: Please help identify these memory chips (DDR2?3)
« Reply #4 on: January 07, 2020, 01:04:30 am »
Its like current Ryzen's DDR4 RAM so called Samsung's B-die ... but you wont get it if you're not into PC overclocking, especially overclocking the RAM.

That D9 was well known to be a beast capable of crazy speed and can bear RAM overvolting, it used to be popular among extreme overclockers.

Offline YansiTopic starter

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Re: Please help identify these memory chips (DDR2?3)
« Reply #5 on: January 07, 2020, 01:08:04 am »
Sorry, not interested in PC overclocking so I do no nil about that stuff.

Can a datasheet be found for these? Interested to know if these are x8 or x16 bit wide.

What may be the speed these could run the CLK at? 266MHz?
 

Online nctnico

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Re: Please help identify these memory chips (DDR2?3)
« Reply #6 on: January 07, 2020, 01:47:35 am »
Just enter the code on the chip in Micron's website to get the actual part number.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Online ataradov

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Re: Please help identify these memory chips (DDR2?3)
« Reply #7 on: January 07, 2020, 01:49:51 am »
No need to google cryptic parts. Here is Micron's decoder https://www.micron.com/support/tools-and-utilities/fbga?fbga=D9dnk#pnlFBGA

Part number here is MT47H16M16BG-5E:B (D9DNK)
Alex
 
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Offline YansiTopic starter

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Re: Please help identify these memory chips (DDR2?3)
« Reply #9 on: January 07, 2020, 11:39:09 am »
Kool! Didn't know about that decryption tool.

So it is a 16bit wide at 400MTU/s or more.  So the overall bus width is likely 48bits.  :-+
 


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