IT8673F View Datasheet(PDF) - ITE Tech. INC.
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MFG CO.
'IT8673F' PDF : 128 Pages View PDF
IT8673F
There are three steps to completing configuration setup: (1) Enter the MB PnP Mode; (2) Modify the data of
configuration registers; (3) Exit the MB PnP Mode. Without normal exiting, it may cause undesired results.
(1) Enter the MB PnP Mode
To enter the MB PnP Mode, 36 special I/O write operations are to be performed during Wait for Key state.
To insure the initial state of the key-check logic, it is first necessary to perform two write operations to the
Address port (279h) of the ISA PnP.
The Entering Key includes two steps. In the first step, four bytes are used to determine the I/O address and
data port of configuration register. In the second step, 32 bytes are written to the Address port determined
by the first four bytes. All 36 bytes must be written properly and sequentially. The corresponding sequential
data for the first four bytes are as follows:
86h, 80h, 55h, 55h;
or 86h, 80h, 55h, AAh;
or 86h, 80h, AAh, 55h;
Address port
3F0h
3BDh
370h
Data port
3F1h
3BFh
371h
The sequential data for the other 32 bytes (same as the initial key of ISA PnP, but written to different I/O
ports) are listed below in hexadecimal numeration:
6A, B5, DA, ED, F6, FB, 7D, BE,
DF, 6F, 37, 1B, 0D, 86, C3, 61,
B0, 58, 2C, 16, 8B, 45, A2, D1,
E8, 74, 3A, 9D, CE, E7, 73, 39,
(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.
(3) Exit the MB PnP Mode
Set bit 1 of the configure control register (Index 02h) to “1” to exit the MB PnP Mode.
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