Warning: If you are here then you agree that I cannot be held at fault
should you damage your hardware as this is untested/unprove content.
Please note that if you have tired to contact me in the
past using the address below and got no reply, chances
are you were filtered out as spam. So please post your
question to the eMachine Upgraders forum.
The Cypress CY28341 Clock Generator is found on the FIC AM37 motherboard
used in quite a few eMachines models. The CY28341-2 is also for the most part
identical so the following mod will work on it also. The CY28341/CY28341-2
can be found on quite a number of Athlon and P4/Celeron motherboards using
the VIA P4M/KM/KT/266/333/400 chipsets.
Tools Needed:
1x Soldering Iron
1x New very small/fine tiped solder tip
1x Some solder lead
4x 10K Resistors
Some Small wires.
Some free time.
Before doing this you should remove the motherboard from the case and
remove everything from the motherboard (such as cpu and ram and such)
just to be safe and for extra free space. Make sure youre discharged
of any static electricity and wear an anti-static wrist strap.
It should be noted I havent tested this and its only theory as I havent
a motherboard with the CY28341/CY28341-2 Clock Generator.
If you test this and find it to work please please email me at:
-e-n-i-g-m-a--d-e-a-d-s-o-u-l-s- -a-t- -y-a-h-o-o- -d-o-t- -c-o-m-
(remove all dashes, replace "-a-t-" with "@" and "-d-o-t-" with "."
I do that so the spam bots do not pick up my email address)
Its recomended you do some cpu benchmarks before and after to see what kind
of performance gain you might have gained! You might use SiSoft's Sandra or
some other popular benchmarking test to get a good idea. When emailing me
send me your test results and screenshots as long as they are under 640x480
and 50kb in size.. also send me pictures of your moded CY28341/CY28341-2
PLL, and give me your website info if you wish for me to post it at the bottom
of this page.
Here is an image of the Pin-Out of the CY28341/CY28341-2.
Here is an list of supported FSB's of the the CY28341/CY28341-2
NOTE:1011 on the CY28341-2 is 166.6MHz.
We are going to leave all of the pins connected as they are all I/O pins.
First we need to connect power to the jumper blocks for logic "1", to do
this we will use VDDC (Pin 51) which supplies a nice 3.3v. Connect
VDDC to pin 1 on the jumper blocks like shown in the picture below.
Now we need to connect ground to the jumper blocks for logic "0",
for this we are going to connect VSSD (Pin 39) to pin 3 on all of the
jumper blocks like shown in the picture below. Next we are going to
connect FS0 (Pin 1) to pin 2 on the fourth jumper block with a 10K
resistor inline, then FS1 (Pin 10) to pin 2 on the third jumper block
with a 10K resistor inline, then FS2 (Pin 21) to pin 2 on the second
jumper block with a 10K resistor inline, and finally FS3 (Pin 20) to
pin 2 on the first jumper block with a 10K resistor inline, all like
shown in the picture below.
Note: If FS0 is left disconnected it will default to logic "1".
If FS1/2/3 are left disconnected they will default to logic "0".
If you already have some jumpers on the motherboard that allow to adjust
a few of the settings (such as the FIC AM37 has a jumper that allows you
to adjust the setting of FS1) you will need to remove the jumper from
the motherboard, or you can save a bit of time by only making jumpers
for the FS pins you don't have jumpers for.
Now to overclock, using the FSB chart above, if it calls for a logic "1"
on FS0 connect the FS0 jumper block middle FS0 pin to the VDDC
pin on the jumper block, if it calls for logic "0" connect the middle
FS0 pin to the VSSD pin on the jumper block. The same hold true
for all of the pins. Using the above FSB chart as a key it will tell
you what to set each pin to for various FSB's.
Wrote up at:03:30 AM EST, Tuesday, April 5th, 2005 - Revision 0
Wrote by: Enigma Deadsouls
Website: http://www.oocities.org/enigmadeadsouls
Names/Info from people who have emailed me their test results:
None at this time.
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any of the info unless you ask me first... however youre free to change text
font,size,color background color/image to match youre site. Youre also free to
remove my navigation bar at the bottom of this page as Im sure it would be
pointless on your site... in other words Im ok with changes as long as its not
to the info unless otherwise aproved by me. Also if you mirror it email me and
give me a link and Ill link to it here.