| T O P I C R E V I E W |
| galactimus |
Posted - 01/05/2019 : 14:57:51
I have a GQ-4x4 and an external power supply 9v 600ma. I plug in the external power supply and get a green power led and then plug in the usb cable. I have tried device M2732A and 2732A. I have tried both of these on 10 different M2732A-2F1 chips. I get the same error when trying to write on each chip. The chips are blank checked twice before writing. The error I get is: Write failed, Address=0x000000, Buffer-0x00 Device=0xFF
I could definitely use some guidance.
Thank you. |
| 18 L A T E S T R E P L I E S (Newest First) |
| anniel |
Posted - 02/15/2019 : 06:09:24
quote:
Originally posted by ByteFight
Haha nice... the flash of death. Putting a dip24 eprom backwards in a chip socket like m2732a reverses the polarity of the power pins giving you a chance for a nice light show.
Rapid UV erase. |
| ByteFight |
Posted - 02/14/2019 : 20:40:28
Haha nice... the flash of death. Putting a dip24 eprom backwards in a chip socket like m2732a reverses the polarity of the power pins giving you a chance for a nice light show. |
| anniel |
Posted - 02/14/2019 : 12:05:43
quote:
Originally posted by ByteFight
The M2732A from china is some kind of counterfeit. They look new and usually they work fine but occasionally get batches where some to all of the chips will not program.
ALSO they screw up the programming voltage. Start at 12.5v and try, then 21v, then 25v. I use lots of these eproms and have a bag of 100 or so dead ones i am saving for some reason.
Despite them being counterfeit and many not working, you can get them for like 70 cents each in bulk. They come in like new condition ready to burn... so beats trying to scrape labels off and erasing old used chips even tho i get a bunch that will not program.
If they program they seem to be fine.
Chip ID is not available for 2732. I also use m27c512 that come from the same Chinese sellers with the counterfeit m2732a that have impossible date code but still identify right as a m27c512
I know why you save them!
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| ByteFight |
Posted - 02/14/2019 : 07:22:42
The M2732A from china is some kind of counterfeit. They look new and usually they work fine but occasionally get batches where some to all of the chips will not program.
ALSO they screw up the programming voltage. Start at 12.5v and try, then 21v, then 25v. I use lots of these eproms and have a bag of 100 or so dead ones i am saving for some reason.
Despite them being counterfeit and many not working, you can get them for like 70 cents each in bulk. They come in like new condition ready to burn... so beats trying to scrape labels off and erasing old used chips even tho i get a bunch that will not program.
If they program they seem to be fine.
Chip ID is not available for 2732. I also use m27c512 that come from the same Chinese sellers with the counterfeit m2732a that have impossible date code but still identify right as a m27c512 |
| anniel |
Posted - 01/06/2019 : 06:07:13
quote:
Originally posted by galactimus
I wanted to follow up here for anyone else who has this issue. This is what I found. The chips I purchased are from China as it turns out, even though they came from a US supplier. I ordered M2732A-2F1 eproms. On the chips they have that label and 21V Fast and the ST logo. I tried the following devices in the GQ software, all with failed writes: M2732A, 2732A 21V, 2732 25V. I then thought what the heck, why not try the 2732B 12.7V device. Sure enough, the eprom wrote and verified. I also read the eprom and did a hex match to the file I wrote to it, outside of GQ software just as an added check. Everything looks good.
So, it looks like the Chinese are making chips and either have no idea the differences between models or they just don't care and mislabel them. The chips do work, they just aren't the model printed on the chip.
Good find, you definitively got fake chips! They pull old chips off the junk heap and print them with a part number they have demand for. You now have "new" chips.
Does the part number seem printed or engraved? If printed you may be able to remove it and the blacktop with acetone or lacquer thinner an see the original numbering.
Can you read the ID with the programmer?
http://www.mcumall.com/forum/topic.asp?TOPIC_ID=8418 |
| galactimus |
Posted - 01/05/2019 : 23:57:33
I wanted to follow up here for anyone else who has this issue. This is what I found. The chips I purchased are from China as it turns out, even though they came from a US supplier. I ordered M2732A-2F1 eproms. On the chips they have that label and 21V Fast and the ST logo. I tried the following devices in the GQ software, all with failed writes: M2732A, 2732A 21V, 2732 25V. I then thought what the heck, why not try the 2732B 12.7V device. Sure enough, the eprom wrote and verified. I also read the eprom and did a hex match to the file I wrote to it, outside of GQ software just as an added check. Everything looks good.
So, it looks like the Chinese are making chips and either have no idea the differences between models or they just don't care and mislabel them. The chips do work, they just aren't the model printed on the chip. |
| galactimus |
Posted - 01/05/2019 : 18:32:47
The data in 0-2 slots are 00 in both the buffer and the eprom. When it gets to slot 3 it doesn't write the buffer value of AF and fails. When I read the device after the fail slots 0-3 are 00.
quote:
Originally posted by anniel
quote:
Originally posted by galactimus
After the failed write, a blank check reveals this error: Device blank check failed at address: 0x000800, Read= 0x00
This error shows up for all 10 chips when blank checked after the failed write attempt.
Does the data at that location corresponds to your file?
|
| galactimus |
Posted - 01/05/2019 : 17:37:02
quote:
Originally posted by anniel
quote:
Originally posted by galactimus
They do look newish. I purchased from a US seller. Got here in 2 days. Could very well be from China. They are marked ST.
quote:
Are those chips "new" from China?
Is the lettering gold coloured?
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| galactimus |
Posted - 01/05/2019 : 17:34:04
No.
quote:
Originally posted by anniel
quote:
Originally posted by galactimus
They do look newish. I purchased from a US seller. Got here in 2 days. Could very well be from China. They are marked ST.
quote:
Are those chips "new" from China?
Is the lettering gold coloured?
|
| anniel |
Posted - 01/05/2019 : 17:22:45
quote:
Originally posted by galactimus
They do look newish. I purchased from a US seller. Got here in 2 days. Could very well be from China. They are marked ST.
quote:
Are those chips "new" from China?
Is the lettering gold coloured? |
| galactimus |
Posted - 01/05/2019 : 17:21:11
They do look newish. I purchased from a US seller. Got here in 2 days. Could very well be from China. They are marked ST.
quote:
Are those chips "new" from China?
|
| anniel |
Posted - 01/05/2019 : 17:12:47
quote:
Originally posted by galactimus
quote:
Originally posted by anniel
quote:
Originally posted by galactimus
I have. Didn't work. Same error
Write fail or blank check?
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233465 bytes
Speed 5.
Are those chips "new" from China? |
| galactimus |
Posted - 01/05/2019 : 16:59:04
quote:
Originally posted by anniel
quote:
Originally posted by galactimus
I have. Didn't work. Same error
Write fail or blank check?
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Image Insert:
233465 bytes |
| anniel |
Posted - 01/05/2019 : 16:43:48
quote:
Originally posted by galactimus
I have. Didn't work. Same error
Write fail or blank check? |
| anniel |
Posted - 01/05/2019 : 16:42:23
quote:
Originally posted by galactimus
After the failed write, a blank check reveals this error: Device blank check failed at address: 0x000800, Read= 0x00
This error shows up for all 10 chips when blank checked after the failed write attempt.
Does the data at that location corresponds to your file? |
| galactimus |
Posted - 01/05/2019 : 16:41:26
I have. Didn't work. Same error |
| anniel |
Posted - 01/05/2019 : 16:40:39
quote:
Originally posted by galactimus
I have a GQ-4x4 and an external power supply 9v 600ma. I plug in the external power supply and get a green power led and then plug in the usb cable. I have tried device M2732A and 2732A. I have tried both of these on 10 different M2732A-2F1 chips. I get the same error when trying to write on each chip. The chips are blank checked twice before writing. The error I get is: Write failed, Address=0x000000, Buffer-0x00 Device=0xFF
I could definitely use some guidance.
Thank you.
Try lower speeds. |
| galactimus |
Posted - 01/05/2019 : 15:22:32
After the failed write, a blank check reveals this error: Device blank check failed at address: 0x000800, Read= 0x00
This error shows up for all 10 chips when blank checked after the failed write attempt. |
