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Necrosaro420
109 Posts |
 Posted - 02/24/2010 : 14:40:34
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| Any idea why? All others working fine on v5 |
Edited by - Necrosaro420 on 02/24/2010 14:57:07
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| Reply #1
ZLM
2945 Posts |
Posted - 02/24/2010 : 22:30:31
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What is exact error you got?
Does it always fail on same address?
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| Reply #2
Necrosaro420
109 Posts |
Posted - 03/02/2010 : 16:03:46
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VerifyFailed, Address=0x002FF0, Device=0xFE, Buffer=0x22
VerifyFailed, Address=0x001F30, Device=0xFF, Buffer=0x7F
VerifyFailed, Address=0x000000, Device=0x0F, Buffer=0x00
Does this on EVERY TMS27C020 |
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| Reply #3
Necrosaro420
109 Posts |
Posted - 03/05/2010 : 16:39:25
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| ? |
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| Reply #4
ZLM
2945 Posts |
Posted - 03/06/2010 : 11:35:46
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not sure why, need more testing.
If possible, please send a testing chip to support@mcumall.com, then we can find out why and fix it for you. |
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| Reply #5
Necrosaro420
109 Posts |
Posted - 03/18/2010 : 13:57:05
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quote:
Originally posted by EZoSat
quote:
VerifyFailed, Address=0x001F30, Device=0xFF, Buffer=0x7F
VerifyFailed, Address=0x000000, Device=0x0F, Buffer=0x00
Does this on EVERY TMS27C020
Try overwrite EPROM . Not all bits 1 in chip are converted to 0. Erase not required.
Measure voltage on EPROM pins 1 (Vpp) and 32 (Vcc) during programming.
Reduced voltage on mentioned pins cause programming failure.
Apply external power supply.
Another attempt, modify line in devices.txt
Name="TMS27C020",ID="9732",Class="27C020",Category="EPROM",MFG="TI",WVCC="6.5V";
Come back with results.
Where is this option in the 5.0 software to overrite?
Also adding that line yields the same results |
Edited by - Necrosaro420 on 03/18/2010 14:01:50 |
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| Reply #6
stangbat
6 Posts |
Posted - 11/04/2010 : 14:03:53
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| I am also having problems with verification of TMS 27C020-15 EEPROMs using my GQ-4X. Two reported verification errors but seem to work fine. I've tried to program two others and both give errors during verification. I haven't tested them to see if they work, but so far all four I've tried give errors during verification. I have hooked up my GQ-4X to an external power supply and I still get errors during verification. |
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| Reply #7
stangbat
6 Posts |
Posted - 11/08/2010 : 06:53:04
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| No ideas or replies? I'm willing to ship a chip for testing purposes. I'd like to see this figured out. |
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| Reply #8
Bad_Ad84
210 Posts |
Posted - 11/09/2010 : 00:27:05
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| Send an email to the address ZLM posted above to get the address and ship the chip for testing. |
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| Reply #9
ZLM
2945 Posts |
Posted - 11/11/2010 : 23:28:39
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If you want to send the chip to us for the testing, then the following address can be used:
MCUmall Electronics Inc.
2465 Beta Avenue, Suite 207,
Burnaby, BC V5C 5N1
Canada
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| Reply #10
stangbat
6 Posts |
Posted - 11/12/2010 : 07:12:51
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| It will be in the mail today. Thanks! |
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| Reply #11
stangbat
6 Posts |
Posted - 01/09/2011 : 07:54:25
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| Any update on this? I mailed the chip on Nov. 12 and sent a detailed note along with my email address. I've heard nothing. I don't care about getting the chip back, I'd just like to know if anyone has looked at this issue and if there will be a possible software update to fix it. |
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| Reply #12
ZLM
2945 Posts |
Posted - 01/09/2011 : 12:30:58
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| Yes. The chips is received and I will let you know the later. |
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| Reply #13
ZLM
2945 Posts |
Posted - 01/17/2011 : 12:55:54
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Found the problem.
The device is required the VPP pin stay in Hi when doing read/verification. So, the device line needs one parameter: RVPP="5V"
Use following line in devices.txt instead the old line:
Name="TMS27C020",ID="9732",Class="27C020",Category="EPROM",MFG="TI",RVpp="5V";
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| Reply #14
stangbat
6 Posts |
Posted - 01/19/2011 : 10:28:17
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| Great! Thanks so much! |
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Topic |
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ALL TMS27C020's fail on verify
