Today I have received two modems by member here who failed to read and program those modems.
Even though there are a lot of information on how to do this already, but most of them used the method that apply 5V on pin 2 of flash. I am not big fan of this and would always try to find ISP pin if possible.
The SB6121 and SB6141 are very similar in hardware design. The SB6121 that came with the box was dead due to the soldering. I was not able to read the flash on the board (some pads are damaged). I managed to read back the flash by removing it from the PCB and connect directly to NT. 3.3v to HOLD and VCC. TRST to WP. The rest connections are the same as it with SB6120.
The SB6141 is fully functional and the ISP pin was found on pin2 of U7. If you connect Pin 1 of USB JTAG NT to pin 2 of U7 (I added additional 100 ohm between to add extra protection). This works exactly like the ISP mode for SB6120.
For tester who would like to program often, make connection like this
viewtopic.php?t=4106
and you do not need any extra 3.3v or 5V. Just connect USB JTAG NT and you are ready to go.
I will soon make a webpage about this ISP method for SB6121/6141 modems. For the past few months, those questions have been asked many times and now we have a final solution.
SB6121 and SB6141 modems.
Moderators: justsomeguy, Koevoet
-
- Junior Member
- Posts: 105
- Joined: Thu Nov 02, 2006 5:56 pm
- Location: C A N A D A
I should have packed it better, box must have been stacked, had some weight on it when shipping. Oh well, now I'll have to install some new pads and re-attach it to the trace.
My main focus is the SB6141 as it does 8x4, might scrap the SB6121 in July when my ISP has there new package.
Do you think 100 ohm is needed between pin1 of the USBJTAG to the ISP points?
Confirmed ISP points?;
-SB6121 ISP point = R153 right side
-SB6141 ISP point = pin2 on U7
My main focus is the SB6141 as it does 8x4, might scrap the SB6121 in July when my ISP has there new package.
Do you think 100 ohm is needed between pin1 of the USBJTAG to the ISP points?
Confirmed ISP points?;
-SB6121 ISP point = R153 right side
-SB6141 ISP point = pin2 on U7
-
- Junior Member
- Posts: 8981
- Joined: Mon Jul 18, 2005 9:33 pm
I used it and it works. Someone had used 2K and works. It is better to add some protection than nothing.Pir8pete wrote:I should have packed it better, box must have been stacked, had some weight on it when shipping. Oh well, now I'll have to install some new pads and re-attach it to the trace.
My main focus is the SB6141 as it does 8x4, might scrap the SB6121 in July when my ISP has there new package.
Do you think 100 ohm is needed between pin1 of the USBJTAG to the ISP points?
Confirmed ISP points?;
-SB6121 ISP point = R153 right side
-SB6141 ISP point = pin2 on U7
-
- Junior Member
- Posts: 133
- Joined: Fri Dec 12, 2008 3:30 pm
-
- Junior Member
- Posts: 166
- Joined: Sat Aug 02, 2008 6:40 pm
- Location: USA
Who is online
Users browsing this forum: No registered users and 2 guests