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E P I C B o a r d
E P I C - 8 5 2 6
There are three steps to complete the configuration setup: (1) Enter
the MB PnP Mode; (2) Modify the data of configuration registers;
(3) Exit the MB PnP Mode. Undesired result may occur if the MB
PnP Mode is not exited normally.
(1) Enter the MB PnP Mode
To enter the MB PnP Mode, four special I/O write operations are to
be performed during Wait for Key state. To ensure the initial state
of the key-check logic, it is necessary to perform four write
operations to the Special Address port (2EH). Two different enter
keys are provided to select configuration ports (2Eh/2Fh) of the
next step.
(2) Modify the Data of the Registers
All configuration registers can be accessed after entering the MB
PnP Mode. Before accessing a selected register, the content of
Index 07h must be changed to the LDN to which the register
belongs, except some Global registers.
(3) Exit the MB PnP Mode
Set bit 1 of the configure control register (Index=02h) to 1 to exit
the MB PnP Mode.
B-3
Appendix A Programming the Watchdog Timer
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