ASUS ASMM User’s Manual
12
I. ASUS ASMM
bit 1
Mode select B
“1”
ASR is in normal mode. The ASR can be enabled after a special I/O write
sequence is executed.
“0”
ASR is under test mode.
bit 0
System in secure mode. A “0” indicates the system is now under secure
mode. A “1” depicts the system is now free for control.
Write
bit 7:3 Reserved.
bit 2
Mode select A
Writing a “1” will select secure mode while it will be enabled after a special I/
O write sequence is executed. A “0” will deselect the secure function.
NOTE: If secure mode is selected and entered, deselecting the secure mode will not
free the system out of secure mode. You must execute the special I/O write sequence
to disable the secure function.
bit 1
Mode select B
Writing a “1” will select ASR under normal mode while ASR will be en-
abled after a special I/O write sequence is executed. A “0” will deselect the
secure function.
bit 0
Reserved
NOTE: If ASR is enabled, putting ASR in test mode will not get the system out of
the ASR normal mode. You must execute the special I/O write sequence to disable
the ASR function.
Chassis Intrusion Reset Register (0x0299/Write only)
Writing any value to this I/O port will clear the memory of the chassis intrusion
circuit. This function may only be activated under administrator control. The status
of chassis intrusion can be retrieved by accessing LM78.
ASR Trigger Register (0x029A/Write only)
Periodically executing I/O write to this port will keep the system reset from driving.
Otherwise, a system hard reset will be generated after a pre-specified period of time
with no I/O write to this register if ASR is enabled.
ASR Enable/Disable Register (0x029B/Write only)
A data pattern of xxxx_0001b must be written into this port to produce a special I/O
write sequence to enable ASR and secure function.
I.ASUS
ASMM
Programming
Interface