hermes with 128MB RAM? possible?

[klikman]

is it possible to upgrade our hermes to 128mb of ram??
anyone done it yet?

[ss1271]

I ve seen a thread in my home's forum, and the key of RAM upgrade is that we must find a technical manual for Hermes' original RAM and the RAM series that will be supported by the mainboard. If u've done this and have got a RAM chip...do it.

[ss1271]

I'll translate them into English line by line

I placed a pic of Hermes' RAM in attachment.

CHT 9000 可以升级到 2G 内存！（仅供参考）
CHT 9000 can upgrade to 2G RAM (for REFERENCE only)

HTC Hermes （CHT9000）系列的产品采用的是 三星 K5D5657ACA-D090 估计可以换成同品牌型号类似的字库 ，至少 HTC 公司内部有人就成功了

HTC Hermes uses product of Samsung K5D5657ACA-D090, and it may be replaced by the same product. At least we have some successful examples from a staff in HTC.

Samsung K5D5657ACA-D0900
The K5D5657ACA is a Multi Chip Package Memory which combines 128Mbit Nand Flash Memory and 64Mbit synchronous high data rate Dynamic RAM. 128Mbit NAND Flash memory is organized as 16M x8 bits and 64Mbit SDRAM is organized as 1M x16 bits x4 banks. In 128Mbit NAND Flash, a 528-Byte page program can be typically achieved within 200us and an 16K-Byte block erase can be typically achieved within 2ms. In serial read operation, a byte can be read by 50ns. DQ pins serve as the ports for address and data input/output as well as command inputs. Even the write-intensive systems can take advantage of FLASH¢s extended reliability of 100K program/erase cycles with real time mapping-out algorithm. These algorithms have been implemented in many mass storage applications. In 64Mbit SDRAM, Synchronous design make a device controlled precisely with the use of system clock and I/O transactions are possible on every clock cycle. Range of operating frequencies, programmable burst length and programmable latencies allow the same device to be useful for a variety of high bandwidth, high performance memory system applications. The K5D5657ACA is suitable for use in data memory of mobile communication system to reduce not only mount area but also power consumption. This device is available in 107-ball FBGA Type.

Samsung Links here (http://www.samsung.com/global/business/semiconductor/ecoMaterialInfoList.do?partnum=K5D5657ACA-D0900)

可更换的型号：

Replace-able partname of RAM.

K5D5729CCA-D0950 (http://www.samsung.com/global/business/semiconductor/ecoMaterialInfoList.do?partnum=K5D5729CCA-D0950)

K5D5757ACM-D0900 (http://www.samsung.com/global/business/semiconductor/ecoMaterialInfoList.do?partnum=K5D5757ACM-D0900)

K5D1G13DCM-D0900

K5D1G13ACH-D0750

K5D1G57ACA-A090T

K5D2G1GACM-A075T

PS : 可向美国三星或者一些专门出售 IC 的网站购买

P.S. you can buy this product from Samsung,US or some IC sellers.

[klikman]

is it possible to get the chip from other htc model?
i have a number of bricked htc himalayas, blueangel, even universal.

what about from hard drive? or computer ram?

[a937898866]

Could you post the link of your home's forum here? Cause I am very interested in this upgrading for Hermes!

By the way, I can read simplified-Chinese!

Thanks in advance!

===========================================
HTC Hermes 200 (CHT9000)
IPL-1.04
SPL-2.10 Olipro
Radio 1.54.30.10

[ss1271]

Could you post the link of your home's forum here? Cause I am very interested in this upgrading for Hermes!

By the way, I can read simplified-Chinese!

Thanks in advance!

===========================================
HTC Hermes 200 (CHT9000)
IPL-1.04
SPL-2.10 Olipro
Radio 1.54.30.10


Here it is.
http://bbs.pdafans.com/thread-466904-1-1.html

you may not read this thread until u've got ID.

[CRCinAU]

Problem is, because this is an FBGA type chip, it's a PITA to remove and resolder. You really do need special tools for it.

[hoft]

Since TYTn II is the upgrade of CHT9000, could it be a reference?

I think we need to prepare at least three things:
1. We need to know if the design of the motherboard can support 128MB RAM;
2. We need to know which IC can be used in CHT9000;
3. We already have ROM that can support 128MB RAM.

I mention TYTn II is beacause we may get imformation from it about point 1 to point 3.

Suppose we can use the same chip that TyTn II is using, we can take a risk to do the upgrade.

[mrvanx]

BGA packaging is a royal arseache to try and do manually, infact im pretty sure its not possible using traditional methods, we are talking pick-n-place reflow soldering here, not using an iron.

[hdubli]

I think, samsung processor cannot address more than 64 MB RAM.Some one posted this already in this forum.So as of now it is not possible

[scholbert]

Hi there,

I think, samsung processor cannot address more than 64 MB RAM.Some one posted this already in this forum.So as of now it is not possible

.. additionally it would be even harder to remove the RAM and FLASH MultiChipPackage from the Samsung MCU.
The picture shown above is the MCP for the radio chipset!!

Have a look at the detailed user manual.
... think wiki link to this manual does not work anymore???

P.S.: if someone's interested i may upload the manual

Regards,

scholbert