Editing Talk:RAM

Jump to navigation Jump to search
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then publish the changes below to finish undoing the edit.

Latest revision Your text
Line 1: Line 1:
source: http://www.edepot.com/playstation3.html#PS3_Motherboard
== Main System Memory ==
 
The PS3 has 256MB of 64 bit bus Rambus XDR main system memory. Some models use four 64MB Samsung chips, while other models uses four 64MB Elpida chips. Note that another 256MB of GDDR3 memory is located inside the RSX chip using four 64MB Samsung chips. The earlier models with hardware PS2 compatibility also contained an extra 32MB of RDRAM using two 16MB Samsung chips.
 
A sample of the Memory chips in different PS3 models:
{| border="1" cellspacing="0" cellpadding="5" border="#999" class="wikitable" style="border:1px solid #999; border-collapse: collapse;"
|- bgcolor="#cccccc"
! Type !! Size !! Speed !! Voltage !! Packaging !! Manufacturer !! Serial Number !! Description
|-
| Rambus XDR || 64MB || 400MHz || 1.8V+/-0.09V || FBGA-104 || Elpida || EDX5116ACSE-3C-E || 256MB total (4 chips) for PS3 System Memory (Initial Models)
|-
| Rambus XDR || 64MB || 400MHz || 1.8V+/-0.09V || FBGA-104 || Samsung || K4Y50164UC-JCB3 || 256MB total (4 chips) for PS3 System Memory (Initial Models)
|-
| Rambus XDR || 64MB || 400MHz || 1.8V+/-0.09V || FBGA-100 || Samsung || K4Y50164UE-JCB3 || 256MB total (4 chips) for PS3 System Memory (CECHG,CECHK)
|-
| Rambus XDR || 64MB || 400MHz || 1.8V+/-0.09V || FBGA-104 || Elpida || X5116ADSE-3C-E || 256MB total (4 chips) for PS3 System Memory (CECH-20xx)
|-
| Rambus XDR || 128MB || 400MHz || 1.5V+/-0.075V || FBGA-150 || Elpida || X1032BASE-3C-F || 256MB total (2 chips) for PS3 System Memory (CECH-21xx and later)
|-
|}
:
 
=== Elpida EDX5116ACSE-3C-E ===
 
<div style="float:right">[[File:EDX5116ACSE-3C-E.png|200px|thumb|left|104-ball FBGA<br />Elpida EDX5116ACSE-3C-E]]</div>
 
Datasheet: [http://www.elpida-korea.com/pdfs/E0881E20.pdf Elpida EDX5116ACSE]
 
<pre>productcode meaning:
E - Elpida Memory
D - Type : Monolithic Device
X - Product Family : XDR RAM
51 - Density : 512M (x16bit)
16 - Organisation : x16bit
A - Supply Voltage : 1.8V, DRSL
C - Die Revision: C
SE - Package : FBGA (with back cover)
-
3C - Speed : 3.2G (tRAC = 35, C Bin)
-
E - Environmental Code : Lead Free</pre>
 
 
=== Samsung K4Y50164UC-JCB3 ===
 
<div style="float:right">[[File:K4Y50164UC-JCB3.png|200px|thumb|left|100-ball FBGA<br />Samsung K4Y50164UC-JCB3]]</div>
 
Datasheet: [http://www.samsung.com/global/system/business/semiconductor/product/2007/6/11/XDR_RDRAM/XDRDRAM/Component/512Mbit/K4Y50164UC/ds_k4y50xx4uc_rev11.pdf Samsung K4Y50164UC-JCB3]
 
<pre>productcode meaning:
K - Samsung Memory
4 - DRAM
Y - Product : XDR RAM
50 - Density : 512M, 32K/16ms(0,49us)
16 - Organisation : x16
4 - Banks : 8
U - Interface : DRSL(1.8V, 1.2V)
C - Generation : 4th
-
J - Packagetype: BOC lead free
C - Temperature & Power: Commercial, Normal Power
B3 - Speed (Data frequency, tRAC, tRC) : 3.2Gbps, 35ns, 24cycles</pre>
 
 
=== Samsung K4Y50164UE-JCB3 ===
 
<div style="float:right">[[File:K4Y50164UE-JCB3.png|200px|thumb|left|104-ball FBGA<br />Samsung K4Y50164UE-JCB3]]</div>
 
Datasheet: [http://www.samsung.com/global/system/business/semiconductor/product/2007/6/11/XDR_RDRAM/XDRDRAM/Component/512Mbit/K4Y50164UE/ds_k4y50xx4ue_rev10.pdf Samsung K4Y50164UE-JCB3]
 
<pre>productcode meaning:
K - Samsung Memory
4 - DRAM
Y - Product : XDR RAM
50 - Density : 512M, 32K/16ms(0,49us)
16 - Organisation : x16
4 - Banks : 8
U - Interface : DRSL(1.8V, 1.2V)
E - Generation : 6th
-
J - Packagetype: BOC lead free
C - Temperature & Power: Commercial, Normal Power
B3 - Speed (Data frequency, tRAC, tRC) : 3.2Gbps, 35ns, 24cycles</pre>
 
 
=== Elpida X5116ADSE-3C-E ===
 
<div style="float:right">[[File:X5116ADSE-3C-E.png|200px|thumb|left|104-ball FBGA<br />Elpida X5116ADSE-3C-E]]</div>
 
Datasheet: [http://www.elpida.com/eolpdfs/E1033E40_EOL.pdf Elpida X5116ADSE-3C-E]
 
<pre>productcode meaning:
X - Product Family : XDR RAM
51 - Density : 512M (x16bit)
16 - Organisation : x16bit
A - Supply Voltage : 1.8V, DRSL
D - Die Revision: D
SE - Package : FBGA (with back cover)
-
3C - Speed : 3.2G (tRAC = 35, C Bin)
-
E - Environmental Code : Lead Free</pre>
 
 
=== Elpida X1032BASE-3C-F ===
 
Datasheet: E1332E50 (EOL)


== Direct Rambus Technology ==
<pre>productcode meaning:
E - Elpida Memory
D - Type : Monolithic Device
X - Product Family : XDR RAM
13 - Density : 1Gbit (128MB) 32Mbitx32
32 - Organisation : x32bit
B - Supply Voltage : 1.5V +/- 0.075V, DRSL
A - Die Revision: A
SE - Package : FBGA (with back cover)
-
3C - Speed : 3.2G (tRAC = 35, C Bin)
-
F - Environmental Code : Lead & Halogen Free</pre>


A PDF from Stanford explains this very well.
== Graphics Memory ==
256MB of GDDR3 memory is located inside the RSX chip using four 64MB Samsung chips.


[http://www.stanford.edu/class/ee382/MISC/rambus.pdf Direct Rambus Technology]
{| border="1" cellspacing="0" cellpadding="5" border="#999" class="wikitable" style="border:1px solid #999; border-collapse: collapse;"
|- bgcolor="#cccccc"
! Type !! Size !! Speed !! Voltage !! Packaging !! Manufacturer !! Serial Number !! Description
|-
| GDDR3 || 64MB || 700MHz ||  ||  || Samsung || K4J52324QC-SC14 || 256MB total (4 chips) for PS3 Graphics Memory
|-
|}
:


== K4Y50164UE-JCB3 Datasheet ==
== PS2 Compatibility Memory ==
The earlier models with hardware PS2 compatibility also contained an extra 32MB of RDRAM using two 16MB Samsung chips.


A very helpful PDF explaining everything there is to know about this chip.
{| border="1" cellspacing="0" cellpadding="5" border="#999" class="wikitable" style="border:1px solid #999; border-collapse: collapse;"
|- bgcolor="#cccccc"
! Type !! Size !! Speed !! Voltage !! Packaging !! Manufacturer !! Serial Number !! Description
|-
| RDRAM || 16MB || 800MHz ||  || 54-pin || Samsung || K4R271669F || 32MB total (2 chips) for Hardware PS2 Compatibility System Memory
|-
|}
:


http://www.keepandshare.com/doc/4521123/k4y50044ue-pdf-3-5-meg?da=y
source: http://www.edepot.com/playstation3.html#PS3_Motherboard


== Backdoor? ==
todo: add datasheet links, more package & pad/pin info, cleanup
According to a tweet by (already deleted, [https://twitter.com/RichDevX/status/504389462496137217 source]), there is a backdoor in XDR Ram that allows the attacker to write to any place in the memory. 16:40, 27 August 2014‎ [[User:Zecoxao]]
: without actual tweet hard to discuss... It is in the nature of /XDR/ RAM to be Random Accessable Memory in the first place ;) As long as you stick to that one module at a time. There is no HV/W^X etc on that hardware level (which takes place in the CPU / OS instead) [[User:Euss|Euss]] ([[User talk:Euss|talk]]) 12:13, 27 August 2014 (EDT)
:: sorry about that, should've taken a picture :P i'm not as fast as you when you're awake :) 17:36, 27 August 2014 [[User:Zecoxao]]
::: According to wikipedia: each chip has a low-speed serial bus used to determine its capabilities and configure its interface. This consists of three shared inputs: a reset line (RST), a serial command input (CMD) and a serial clock (SCK), and serial data in/out lines (SDI and SDO) that are daisy-chained together and eventually connect to a single pin on the memory controller. [http://en.wikipedia.org/wiki/XDR_DRAM#Protocol Source] 19:25, 27 August 2014 [[User:NiceShot]]
Please note that all contributions to PS3 Developer wiki are considered to be released under the GNU Free Documentation License 1.2 (see PS3 Developer wiki:Copyrights for details). If you do not want your writing to be edited mercilessly and redistributed at will, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource. Do not submit copyrighted work without permission!

To protect the wiki against automated edit spam, we kindly ask you to solve the following hCaptcha:

Cancel Editing help (opens in new window)
Retrieved from "http://www.psdevwiki.com/ps3/Talk:RAM"