| Electronics > Repair |
| TDS3014 adventures |
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| Maxis:
Hello Sicco! Thank you for your detailed reply! I would use your board with the pleasure, but I'd like to do my learning kinda hands on the project. There are a few points which are not quite clear yet: 1. As you have kindly explained - the information in the Dallas chip is vital for proper Ethernet functioning. But the question is - how these bytes made its way into the Dallas at the first place? Normally if I just borrow TDS3EM from someone it will work straight away, right? If so, then I can assume that beforehand I can check whether the settings are correct with the stock TDS3EM and only then use your baseline schematics. Also what I know there is no need in "harmonizing" Dallas prior to installation of TDS3EM module. Otherwise Tek would supply the floppy with the specific license installer to perform Dallas NVRAM "harmonization" (often this is how it's done on Agilent equipment). If all the above fails with the stock TDS3EM, then I can assume that the NVRAM is corrupted and then I need to use your NVRAM image, right? 2. You have mentioned that I can use the BDM port to program. By looking at the connector pinout on your schematics I've got to use not only JTAG lines (TCK, TDO, TDI + Hard Reset + Soft Reset + IRQ6), but also I need to connect the TXD_SM and RXD_SM UART lines, right? Cause as you mentioned all the FW debug messages are communicated via the UART SM port. 3. The option module already has everything loaded thanks to the awesome contributors of this forum! However, I wonder how do you get a transparent access to the devices connected to PowerQuicc via BDM. Do you need to load a debug portion of the code into PowerQuicc prior to it, or BDM uses the bit-banging protocol like in the case of JTAG? Have you developed the tools to emulate the bus access via PowerQuicc pins or you used the standard facilities of the BDM debugger? Thank you very much for your help! |
| sicco:
Maxis, If you plug in a working borrowed-from-someone- TDS3EM then your TDS3000 may or may not work. If the scope’s NVRAM no longer has its original ex-factory ethernet config bytes properly set then it (ethernet) will not work. A dead battery in the NVRAM means original settings data is lost. To get the NVRAM reloaded with a working image, it’s either eject from a DIP 24 socket (which i envision you have by now) or desolder the DIP24 DS1742W and use an old EPROM programmer, or use BDM. There might be utilities using floppy disks, maybe serial port backdoors, but i’m unaware of those. The BDM port is explained in some detail in the NXP datasheet / XPC8xx user manual. It shares some but not all of the JTAG pins. The serial port (UART1 or 2) is not needed. But BDM is a legacy. Initially JTAG was for testing hardware pins, while BDM was for in circuit debugging. Nowadays JTAG is for everything. But not yet on this CPU. BDM for this CPU is more about pushing opcodes into the CPU that the PowerPC then executes, single step, when halted. Hardware needed for BDM to USB to PC is just an FTDI2232 or FT4232 with its eprom, xtal etc. Software is a lot more... |
| Maxis:
Hello Sicco, Thank you for clarifying the subject. In my scope the NVRAM is still alive and kicking. So, I'll try with its stock content hoping that everything will work w/o its reprogramming. I'll post here any updates on this subject! |
| james_s:
Surely there's a way to write to the NVRAM using GPIB or serial commands? Of course you'd have to know the address where the relevant info is stored. |
| SMdude:
Hi Guys, Does anybody have any info on the battery gas gauge used in the li-ion packs? After buying one from ebay and having it confiscated by the "global shipping program" (yes I got a full refund, but I still don't have a battery!) I have now resigned to the fact that I will just have to build a battery for it instead. So it would be nice for completeness sake if the fuel gauge would work. I'll probably start a new thread for it in the coming weeks, just trying to gather as much info in the mean time. Looking at the available space a 4s3p pack/setup will fit nicely with room for the protection cct and charger board. Housing will be 3d printed. Any photos or info would be greatly appreciated. Cheers |
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