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5.
How to minimize the intrusion of the POTF?
POTF will be activated based on the HEW commands, such as memory edit or refresh. If several
memory windows are opened, HEW will read back all the windows content. Thus, user is advised to
open the memory window at minimal size, in order to avoid unnecessary intrusion.
6.
How much current will the emulator draw from the target system?
The emulator will not consume the target system supply. It will generate an user VCC for internal usage,
which has an identical level as the target system power supply.
7.
Why is the program halted at an address that is not specified in the preset combination
breakpoint?
The emulator will break out of the user code execution once it has detected the preset condition.
However the emulator will not stop execution immediately as it has to complete its current tasks, thus
the code will not break at its preset address.
Another point to note is the prefetch condition, if the preset condition matches the prefetch instruction,
the emulator will also enter the break mode.
The worst case scenario is: if a break condition is set at the beginning of subroutine B, which codes are
stacking behind subroutine A. A break condition will happen when subroutine A is called. This is due to
the prefetching of subroutine B code when subroutine A is returning to the main routine.
8.
What is the CABLE_IN_N signal used for?
This signal is used by the emulator to identify target connection. When CABLE_IN_N is lo, the emulator
will know that target is connected, and the power supply will be switched to follow the target power
supply.
9.
How about Mode, Clock , RES, NMI & STBY signals? How does the emulator control these
signals?
Generally, the emulator will control all the above signals. The only uncontrollable item will be the target
power supply. The emulator will follow the target supply once the cable is detected. User has to set the
above signals in the Configure Platform dialog. User can set the Mode & Clock signal to follow the target
system or any options that is available in the selection. The RES & NMI pins are set to follow the target
in default. User can choose to mask these signals in the configure window. STBY is masked in default.
10.
Why is STBY pin masked in default?
STBY pin will initialise some of the emulator registers. Thus, user is advised not to use the signal unless
necessary.
11.
Why is C-Level Stepping not possible?
If the disassembly window is opened, the step-in instruction will command a single step execution of the
assembly code. User has to close the disassembly windows. This will inform the system to perform C-
Level stepping of the loaded C-code.
12.
Why must the Programmable Function Generator (PFG) be programmed at power up? What is
the PFG used for?
The PFG is implemented using a RAM-based FPGA. Thus it must be programmed at power-up. The
PFG is implemented for its flexibilities. A single chip FPGA is used to implement the PFG which can be
programmed to any functions that can help user to debug their target system. Please feedback your
needs to the design group so that more effective functions can be developed.
F-2
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