FAQs for BDM-68K

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M68360 QUADS Board and BDM (68360)

Ref: 0015
What can I do to emulate the M68360 QUADS Board with the BDM Debugger?

The watchdogs of both QUICCs are active after the execution of the SYStem.Up command. The master QUICC is immediately after RESET in debug mode, but the periphery of the slave will continue to run. So you have about 1 s until the watchdog of the slave will become active. You must use this second to disable this watchdog. There are two possibilities:
1. If you use the original boot EPROM:
  wait 1.0s
2. If you have no boot EPROM
; init Master MBAR
  d.s cpu:3ff00 %L 20001
; init Slave MBAR
  d.s cpu:3ff08 %W 0bfff
  d.s cpu:3ff04 %W 2
  d.s cpu:3ff08 %W 0bfff
  d.s cpu:3ff06 %W 2001
  d.s sd:23022 %b 37
; disable Master WD
  d.s sd:21022 %b 37
; disable Slave WD
  d.s sd:23022 %b 37


Ref: 0039
Sometimes I receive the error message: "DTACK error reported by CPU" after the execution of the SYStem.Up command.

After reset the CPU fetches first the stack pointer and the PC. If the fetched PC value is invalid it is impossibe to enter debug mode in the normal way. In this case the debugger asserts the BERR line on the BDM connector to enter debug mode. This special debug mode entry is indicated by the warning
DTACK error reported by CPU
This is only a warning and you can continue to work as usual.

3.3 V support for 68K CPU's (68K)

Ref: 0111
Is my 68K ICD Debugger prepared for 3.3 V support?

All CPU specific ICD dongle after 07.98 with a serial number like 9807000xxxx with xxxx greater than 3000 support 3.3 V CPUs.
The JTAG/BDM input signals to the CPU will be driven with the same voltage detected on the VCCS pin.

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Last generated/modified: 20-May-2019