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diz
USA
11 Posts |
 Posted - 01/17/2007 : 15:44:41
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I recently purchased a True USB GQ-2X programmer and am confused if this model supports reading and/or writing 2716 devices? I've read on some internet newsgroups that this model doesn't support 2716 devices, but 2716's are included in the supported device list.
When I attempt to read a 2716 at any of the available settings in the device list I get mostly zeros with a sprinkling of "01"'s here and there. I even went as far as to erase the 2716 using an UV eraser and still when I go to read it, I don't get "FF"'s, I still get roughly the same data pattern ("00"'s etc.).
I'm not using an external power source (should I?) |
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| Reply #1
ZLM
2945 Posts |
Posted - 01/18/2007 : 12:25:19
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What's is your exact part number? It is listed in the verified device list(not generic type in list)?
Try use an external power. The power adapter info can be found from help from the software. |
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| Reply #2
diz
USA
11 Posts |
Posted - 01/18/2007 : 14:24:20
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Thanks for the response ZLM. I'll reply with the exact part number later this evening when I'm home and can look at the EPROM. I do however remember that the manufacturer was National Semiconductor, but don't recall the exact part number off the top of my head.
Regarding the use of external power, I thought that would only be important if I am writing to the device. So far, I'm just trying to read from the device. |
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| Reply #3
diz
USA
11 Posts |
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| Reply #4
ZLM
2945 Posts |
Posted - 01/19/2007 : 01:01:01
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The chip should be OK.
Please try to use a external power. OR measure the voltage between Pin12 (GND) and Pin24(VCC)during the reading operation. |
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| Reply #5
diz
USA
11 Posts |
Posted - 01/19/2007 : 16:22:38
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I measured the voltage across GND and Vcc. The max voltage was about 4.67 VDC. If this is a 450ns part, then this I guess is lower than the 5% tolerance range of the chip for 5V.
I also tried to read a different 2716 chip(Fairchild? MBM2716) and the GQ-2X had no problem reading the data from the chip.
Next step is to try an external adapter and measure the voltage... |
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| Reply #6
diz
USA
11 Posts |
Posted - 01/25/2007 : 19:08:08
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Well, I finally had a chance to test this with external power.
I bought a 300mA variable power adapter at Radio Shack (P/N 273-1662). The adapter has 7 discrete settings (i.e., 1.5, 3, 4.5, 6, 7.5, 9, & 12 VDC). I only tried the 9V and 12V settings. On 9V, I still could not read the data from the EPROM. On 12V, I could read the data (all FF's, since it was a blanked EPROM). That's good. I did measure the voltage during the read when using 12VDC external power and I'm seeing now about 7.32VDC across pins 12 (GND) & 24 (Vcc). However, when I tried to burn the EPROM, it failed on on the first byte (tried to write a 0x96 and got back a 0xDF). I measured the voltage across pins 12 (GND) & 21 (Vpp) during the write and it maxed out at about 24.9VDC.
I'm using the "2716(25V Vpp)" setting. Dip switches are set to 1,6,8 ON, all other switches OFF (as instructed).
Any other ideas? |
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| Reply #7
diz
USA
11 Posts |
Posted - 01/29/2007 : 22:21:25
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It is true, I measured 7.32VDC.
Has anyone had success reading/writing 2716 EPROMs on the True USB GQ-2X with or without external power? If so, please post what manufacturer and device type you used, what settings you used on the GQ-2X, and if you used external power, what voltage you used. Thanks. |
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| Reply #8
ZLM
2945 Posts |
Posted - 01/30/2007 : 17:00:20
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quote:
Originally posted by diz
It is true, I measured 7.32VDC.
Has anyone had success reading/writing 2716 EPROMs on the True USB GQ-2X with or without external power? If so, please post what manufacturer and device type you used, what settings you used on the GQ-2X, and if you used external power, what voltage you used. Thanks.
7.32V is not the right voltage. If you got 4.67 VDC when using USB power, but the external power you got 7.31V, then there are something wrong with the external power related. Did you measured the 7.31V with chip in ZIF or not?
I have used M2716, NMC27C16Q and HN462716 have no problem. |
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| Reply #9
diz
USA
11 Posts |
Posted - 01/31/2007 : 14:15:46
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quote:
Originally posted by ZLM
quote:
Originally posted by diz
It is true, I measured 7.32VDC.
Has anyone had success reading/writing 2716 EPROMs on the True USB GQ-2X with or without external power? If so, please post what manufacturer and device type you used, what settings you used on the GQ-2X, and if you used external power, what voltage you used. Thanks.
7.32V is not the right voltage. If you got 4.67 VDC when using USB power, but the external power you got 7.31V, then there are something wrong with the external power related. Did you measured the 7.31V with chip in ZIF or not?
I have used M2716, NMC27C16Q and HN462716 have no problem.
I measured the 7.32V during a read across pins 12 (GND) & 24 (Vcc) of the chip as it sat in the ZIF. I'll go back and check this again, but I also was surprised that the external power affected the voltage during the read. What do you think could be wrong with the external power?
BTW, thanks for the info on what 2716 chips have been found to work on the GQ-2X. I will try to purchase some of these chips and see if I have better luck. When you said you had "no problem", were you using external power? |
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| Reply #10
ZLM
2945 Posts |
Posted - 02/01/2007 : 15:54:23
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Would you please download the Re1.10 for tesing on MM2716Q?
Only USB power is needed.
Let me know if it works. |
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| Reply #11
diz
USA
11 Posts |
Posted - 02/12/2007 : 20:38:16
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| Sorry, I haven't checked this forum in a while and just read the latest posting from ZLM to try release 1.10. I'll do that and report back the results... |
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| Reply #12
diz
USA
11 Posts |
Posted - 02/13/2007 : 21:34:46
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| I installed release 1.10. This time using 1.10, without using external power, I was able to read and successfully ran the blank check for an erased/blank MM2716Q. However, when tried to burn the EPROM, it failed on the first byte (Buffer=0x96,Device=0x1d). I then tried to burn the EPROM again using external power. It failed again in the same way with either 9V or 12V of external power. |
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| Reply #13
ZLM
2945 Posts |
Posted - 02/14/2007 : 08:19:00
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Did you try on a lower speed?
This chip should be supported. May be the chip is demaged already.
Are you able to send us the chip? So that we can check the chip and send it back once it done. If so, please write to support@mcumall.com |
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| Reply #14
diz
USA
11 Posts |
Posted - 02/14/2007 : 14:40:01
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| I did not try on a lower speed. I do recall that it was set by default to the highest speed. I will try lowering the speed to see if that helps. If it doesn't, sending the chip to you to debug is not a problem. I'll post again when I have new info to share... |
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| Reply #15
diz
USA
11 Posts |
Posted - 02/18/2007 : 18:43:48
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| I tried to burn the EPROM again, this time at the lowest speed setting. It still is failing early in the burn. I will email support for instructions to send in my EPROM so that you can debug the problem. |
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Topic |
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Support for 2716?
