GBA1000 rev4 Build Log

[Tuxbar81]

I want to send him the complete doc of the gba 1000 with complete components list and schematics to help him to build his GBA.
If I remember well, some of them where available onto Amibay. This will avoid him to waste his time to search!

 

[croupier]

Please, send me you email, I have a pdf file which will be useful for you.

E-mail sent to your PM....

For Digikey I would need a bigger order to compensate the postage...they quote me only by courier....which is a killing!:wooha:

 

[lemmingn0s]

L104 = FB 105Ohm (as L1 for example)
R135 = 1,5 KOhm
R136 = 33R2 (33,2 Ohm)
R137 & R138 are not to be soldered, as RN5.
The IC11 quartz = 28,735MHz.

Sure about R135 and R136?
My bomV4 says R135=33R2 , R136=1K5R ; so which is correct?

Is IC61 also 28,735MHz?

 

[cpiace64]

IC61 is 50Mhz

 

[BloodyCactus]

I think you mean, 100mhz if your talking the main cpu osc. since its 2* speed of cpu. (50mhz cpu, 100mhz osc)

 

[lemmingn0s]

I think you mean, 100mhz if your talking the main cpu osc. since its 2* speed of cpu. (50mhz cpu, 100mhz osc)

Ah yes, of course, I was confused since both we're listed on the same line in my BOM. 100MHz it is. Thanks anyway
How about those R135, R136 values then, can anybody confirm?

 

[cpiace64]

on board i read 50mhz. on exel read 48mhz

my board is complete at 95% and don't verify

 

[Tuxbar81]

Yes, you're right Lemmingsn0
I have made an inversion of resistances values When I've written the message. Really sorryicard

So, the good values are:

R135: 33R2
R136: 1K5R

About oscillators:
IC11 = 28,735 MHz
IC61 = 100 MHz

 

[lemmingn0s]

So, the good values are:

R135: 33R2
R136: 1K5R

Excellent, thanks for clarifying that

Ok, two questions about RAM:
1. Speed for 514400 IC:s. 70ns ok? Any other need-to-know preferences for these?
2. Farnell has plenty of different CY7C1049 RAM:s, however not the CY7C1049-"10J" (614008-10J at Kessler) as specified by the GBA1000 guide. CY7C1049DV33-10VXI (SOJ36) is the most affordable of the lot, with supply voltage of 3-3.6V.
Only one 4-5.5V option exists at Farnell, the CY7C1049D-10VXI.
A bit annoyingly Kessler Elektronik's 614008-10J item listing doesn't come with a datasheet, so the supply voltage and other specifics are currently a mystery to me. So, which CY7C1049:s to choose?

 

[BloodyCactus]

I know I have CY7C1049D-10VXI but have not soldered them yet so cant confirm good/bad. 4.5-5.5v/10ns.
*edit* I believe the -10J is LEAD version, the 10VX is lead free version.

My 514400's are MSM514400D-60SJ, 60ns chips, 5v.

 

[wali7]

yamakakiche - what type of CY7C1049 have you used? I found (at the end of this topic) information, that CY7C1049CV33-15VXC I have, may be not good. Could you check it in your board? Or any guy with finished and working GBA1000?
By the way - excellent job!

 

[Firedawg]

yamakakiche - what type of CY7C1049 have you used? I found (at the end of this topic) information, that CY7C1049CV33-15VXC I have, may be not good. Could you check it in your board? Or any guy with finished and working GBA1000?
By the way - excellent job!

I received my CY7C1049CV33-15VXC from Kipper2K. I have not installed them yet, but many of us have them. Below is the definitions for the codes on the chips that I have. You can find them in the datasheets.

Ordering Code Definitions:

CY - 7 - C -1 - 04 - 9 - C - V33 - XX - XX - X - X

CY = Cypress
7 = SRAM
C = Technology Code: C=CMOS
1 = Fast Asynchronous SRAM family
04 = 4-Mbit density
9 = Data with x 8-bits
C = Process Technology: C = 150nm
V33 = V33 = 3.0 V to 3.6 V
XX = Speed Grade: XX = 10 ns or 12 ns or 15 ns
XX = Package Type: XX = V or ZSV = 36-pin (400-Mil) Molded SOJ
X = X = Pb-free; X Absent = Leaded
X = C = C = Commercial

Mike

 

[wali7]

Firedawg you are right. What I am worrying about is the fact my (and yours) SRAMs are 3.3 V... I am afraid it should be 5 V. What is your opinion? (I hope I am wrong and they are proper )

 

[Firedawg]

Firedawg you are right. What I am worrying about is the fact my (and yours) SRAMs are 3.3 V... I am afraid it should be 5 V. What is your opinion? (I hope I am wrong and they are proper )

Reading the data sheet on the CY7C1049CV33 the Supply Voltage VCC limit is -0.5 V to +4.6 VDC. Never want to operate at the upper maximum for any device as it will fail sooner than later. So, it is not looking very encouraging. Someone with a bit more schematic and voltage knowledge would have to chime in. I will try to reach out to Kipper as he sourced the component for the build.

Mike

 

[cpiace64]

argh, the ram are 3,3v, need change all or insert a voltage regulator for 3,3 volt but where?

 

[yamakakiche]

On my working board I have :

CY7C1049CV
33-15VXC
1131 R 04
634956

It works very fine...

 

[Firedawg]

On my working board I have :

CY7C1049CV
33-15VXC
1131 R 04
634956

It works very fine...

@yamakakiche

I have the same chips, and glad to hear that they are working. The only concern I have is that if the voltage being received is at the high end of the maximum or above that it will cause a failure at some point. Can you get a Multimeter reading of the voltage on pins 9 and 27 of any of the CY7C1049 chips? Let us know what you find.

Thanks,
Mike

 

[yamakakiche]

I'll check ASAP

 

[wali7]

Good to know, thanks yamakakiche. Anyway, I have the same concerns as Firedewg: lifetime of our 3.3 V SRAMS in GBA1000 may be dramatically reduced
Does anybody is SURE what voltage of these SRAMs should be?

 

[Firedawg]

I'll check ASAP

That works for me too!

---------- Post added at 01:16 ---------- Previous post was at 00:25 ----------

Good to know, thanks yamakakiche. Anyway, I have the same concerns as Firedewg: lifetime of our 3.3 V SRAMS in GBA1000 may be dramatically reduced
Does anybody is SURE what voltage of these SRAMs should be?

Looking at past GBA1000 builds K6R4008C1D-JC10 (+5.0V) fast memory chips were used quite a few times. Nothing has changed in this 4th version of the board that would require less voltage on memory chips. I know CY7C1049CV33 are working currently by proof of yamakakiche board, but still the stress placed on these chips over a long period of use could cause them to fail eventually. So, my thinking is to replace the chips with the +5.0V device to play it safe and keep the build within voltage specs. It's only money!!!!oh:

Updated my BOM with CY7C1049D-10VXI (4.5 V–5.5 V) to order when ready to build.

Mike