Drd420re

[JTog]

The box is not listed, I did try all STi5500 based devices - no go.

The program doesn't sense the device after it turned on: "USB CONNECTED" and "BOX OFF". Same if I boot it in BFR mode (a jumper to GND).

It should report IDCODE at least, but I'm getting ID=0.

The receiver is good - jKeys (using direct cable to LPT) works fine with all parts: RAM, flash, OTP and NVRAM.

[Pichardo]

what hardware are you using . .. usbbdm(nt) or usbjtag(nt) ?

Because this section is for USBBDM.

Keep Trying . . . !

[usbbdm]

First you need to see if it is DCU or DCU3. Then make an xml for that target.
Most testers here testing MIPS and if you select MIPS then you are not going anywhere.
However I think in this case it is more likely the connection and JTAG speed. NT has 12MHz JTAG clock and can adjust to 6M and 3M. Some device if it is bricked can only use 3M clock.

[JTog]

Oops, please move the thread to usbjtagnt forum.

Yes, it's old DCU style JTAG interface, similar to DCU in 2700. It's support same speed. I did try 6 and 3 MHz - got same ID=0.

Would nice to have in the SW a SystemReset button, j/c.

[usbbdm]

If reset pin is connected then you can type "reset" to get reset function.

[usbbdm]

If ID is 0 then there is problem in the connection issue.

[JTog]

If reset pin is connected then you can type "reset" to get reset function.

It's good to know - I'll check.

As to connection - custom made cable checked by DMM for continuity and proper pinout.

Could be something in algos ? My beef is in the status"BOX OFF" when it on.
How the indicator creating ?

Code: Select all

Sig DRD420RE <-> USBJTAG
GND   1 - X
TDO   3 - 5
TCK   5 - 9
TMS   7 - 7
TDI   9 - 3
TRST 11 - 1
RST  13 - 11
GND   1,2,6,8,10,12,14 - 2,4,6,8,10

[JTog]

One more question: what are USBJTAG pins 12,13,14 for?

For sure it's not a GND.

[usbbdm]

It's good to know - I'll check.

As to connection - custom made cable checked by DMM for continuity and proper pinout.

Could be something in algos ? My beef is in the status"BOX OFF" when it on.
How the indicator creating ?

Code: Select all

Sig DRD420RE <-> USBJTAG
GND   1 - X
TDO   3 - 5
TCK   5 - 9
TMS   7 - 7
TDI   9 - 3
TRST 11 - 1
RST  13 - 11
GND   1,2,6,8,10,12,14 - 2,4,6,8,10

Your connection does not like ST20 JTAG. Unless JTAG NT is bad, you should always get CPU ID regardless the JTAG clock selection is good or not.

[JTog]

Some info from STi5500 specs:
- TCK min period is 50 nS, adding propagation 50 nS ...

So for old STM models from ST20 family recommended run JTAG at 5 MHz by STM manuals.

Perhaps if it possible you could add a few more freqs ?
Like 5 MHz, 10 MHz and 20 MHz.
STi5518 support x2.5 JTAG speed.
Perhaps newest models has higher rate.

[JTog]

The receiver is direct tv model, not dish. Perhaps need separate forum for such boxes.

[JTog]

If reset pin is connected then you can type "reset" to get reset function.

It does works.

[JTog]

Your connection does not like ST20 JTAG. Unless JTAG NT is bad, you should always get CPU ID regardless the JTAG clock selection is good or not.

It's not DCU style connector, but by all other means: signals and CPU it's the same.
Don't judge by different pinout.

The gadget is OK - I told that in other thread last days.

Wanna see scope pictures or Logic Ananlyzer snapshot ?

PS. Debug control unit [DCU] doesn't limited to 20 pin connector and its pinout as used in dish boxes.

[usbbdm]

Type "speed 2" will give you 3M JTAG clock.
JTAG is asynchronous protocol, thus the JTAG clock is not required to be precise. As long as you do not use higher clock than it allowed. I have not yet seen any CPU which cannot support 12M JTAG clock when it is not bricked. If it is bricked you might need to use slower clock since the registers are not initialized properly.

[usbbdm]

I am more interested to watch your issue with 301.013. I am pretty sure 301.013 works ok. Even my old USB JTAG works great and it will be about 50-100 times faster than JKeys.