Jan 22, 2021
09:31 AM
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Jan 22, 2021
09:31 AM
Hi there,
I'm trying to connect via the DAP port (miniWiggler) to a TC399 which is replacing a TC299 on one our products and am failing.
The error messages from the memtool consists of "can't connect to target" and "can't connect to device via DAS".
The DAS Device Scanner shows nothing while listing the device when a product with the TC299 is installed.
This is the first time attempting to connect to the chip and program it.
Any suggestions?
I'm trying to connect via the DAP port (miniWiggler) to a TC399 which is replacing a TC299 on one our products and am failing.
The error messages from the memtool consists of "can't connect to target" and "can't connect to device via DAS".
The DAS Device Scanner shows nothing while listing the device when a product with the TC299 is installed.
This is the first time attempting to connect to the chip and program it.
Any suggestions?
- Tags:
- IFX
5 Replies
Jan 26, 2021
07:26 PM
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Jan 26, 2021
07:26 PM
Hi,
In general, we can check the following pins:
/PORST
XTAL
HWCFG
all relevant supply pins (Vdd, Vddp3, Vext, Vflex, Vddm, Vddsb, Vebu)
/ESR0
/TRST
/TESTMODE
With a debugger, we can also check the Reset Status Register (RSTSTAT) for hints.
In general, we can check the following pins:
/PORST
XTAL
HWCFG
all relevant supply pins (Vdd, Vddp3, Vext, Vflex, Vddm, Vddsb, Vebu)
/ESR0
/TRST
/TESTMODE
With a debugger, we can also check the Reset Status Register (RSTSTAT) for hints.
Jan 28, 2021
11:49 AM
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Jan 28, 2021
11:49 AM
You made some adaptations for replacing the TC299 with a TC399? You can't remove TC299 and assemble TC399 instead directly.
Feb 03, 2021
08:17 AM
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Feb 03, 2021
08:17 AM
Adaptations were not made, as it were.
Looking at the schematic for the TC399 eval board (sheet 5), it appears that the TLF11251 (U503) needs to be added to the 1v25 buck converter circuit, even though it's denoted as optional. Currently we're seeing oscillation on the 3v3 and 1v3 rails.
Are additional mods required to enable a 299 to 399 swap?
Looking at the schematic for the TC399 eval board (sheet 5), it appears that the TLF11251 (U503) needs to be added to the 1v25 buck converter circuit, even though it's denoted as optional. Currently we're seeing oscillation on the 3v3 and 1v3 rails.
Are additional mods required to enable a 299 to 399 swap?
Feb 03, 2021
12:14 PM
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Feb 03, 2021
12:14 PM
In this case you made shortcut between 3v3 and 1v3 via the TC399 itself. As I wrote you can't simple replace the TC299 by a TC399.
TC299 ball J21 and K20 are VDDFL3 and on your board connected to 3,3V. TC399 ball J21 and K20 are connected to VDD and must be connected to 1,3V. Because this balls on TC399 are connected to other VDD pins via the substrate you make here an shortcut from 3,3V to 1,3V.
This should be the reason for oscillation. Please note, I don't known if there is now any damage on the TC399 because of supplying VDD with 3,3V.
TC299 ball J21 and K20 are VDDFL3 and on your board connected to 3,3V. TC399 ball J21 and K20 are connected to VDD and must be connected to 1,3V. Because this balls on TC399 are connected to other VDD pins via the substrate you make here an shortcut from 3,3V to 1,3V.
This should be the reason for oscillation. Please note, I don't known if there is now any damage on the TC399 because of supplying VDD with 3,3V.
Feb 04, 2021
07:03 AM
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Feb 04, 2021
07:03 AM
Thank you very much for the prompt reply.
I'll have to get back to you at a later date once we've attempted and verified the fix.
I'll have to get back to you at a later date once we've attempted and verified the fix.