
REJ10J1589-0100
Rev.1.00 Jul.01.07
page
5 of 8
1. When using Windows XP or Windows 2000
Key Value
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\
Parameters\SackOpts
0 (REG_DWORD)
You can set this registry by executing the registry setup program, "Sack.exe". And you can clear
the registry with running the program "UnSack.exe".
- Sack.exe", the program setting the registry.
- Unsack.exe", the program clearing the registry.
The above programs are installed under the directory "\Utility" in the directory where the
emulator software is installed.
(Ex. C:\ Renesas\HEW\Tools\Renesas\DebugComp\Platform\PDTarget)
When using Windows XP/2000, make sure Sack.exe and UnSack.exe are executed by a user who
has Administrator rights. Users without Administrator rights cannot set the registry.
Supplementary:
Windows XP/2000 TCP supports "Selective Acknowledgments (SACK)" as documented in RFC
2018. SACK gives higher performance in the network which have high bandwidth and long round-
trip delays like satellite channels. SACK support is enabled by default in Windows XP/2000. It is
necessary for LAN communication with emulators by Windows XP/2000 to disable SACK support.
Setting the above registry can disable SACK support.
Note that when you use the network which have high bandwidth and long round-trip delays like
satellite channels, the performance with SACK support disabled is lower than with enabled.
1.20.4 Disassembly display in Trace window
The disassembled instructions may not be displayed correctly in the case blow:
- The operand fetch results are not stored in the trace memory because of the lack of the trace
memory.
- Address match interrupt occurred just after the opecode fetch.
1.20.5 The option “Attempt to access memory even in WAIT/STOP mode”
The option “Attempt to access memory even in WAIT/STOP mode” has been added since the
emulator debugger V.1.03. If the option is OFF, the debugger checks whether the status of the
connected MCU is HALT. And if the MCU is in HALT status, debugger does not access memory. This
behavior will improve the freeze for several seconds because of the memory access to the MCU in
HALT status. Instead, it will cause a little overhead to check the status in each memory accesses. Set
the check to this option, if the operations slow because of the overhead.
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