W83977EF-AW datasheet(82/142 Pages) WINBOND

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W83977EF-AW Datasheet(PDF) 82 Page - Winbond

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W83977EF-AW/W83977EG-AW

-80-

10. PLUG AND PLAY CONFIGURATION

W83977EF/EG uses Compatible PNP protocol to access configuration registers for setting up different

types of configurations. In W83977EF/EG, there are nine Logical Devices (from Logical Device 0 to

Logical Device A with the exception of logical device 4 and 6 for compatibility) which correspond to

nine individual functions: FDC (logical device 0), PRT (logical device 1), UART1 (logical device 2),

UART2 (logical device 3), KBC (logical device 5), GPIO1 (logical device 7), GPIO2 (logical device 8),

and ACPI ((logical device A). Each Logical Device has its own configuration registers (above CR30).

Host can access those registers by writing an appropriate logical device number into logical device

select register at CR7.

10.1 Compatible PnP

10.1.1 Extended Function Registers

In Compatible PnP, there are two ways to enter Extended Function and read or write the configuration

registers. HEFRAS (CR26 bit 6) can be used to select one out of these two methods of entering the

Extended Function mode as follows:

HEFRAS

ADDRESS AND VALUE

write 87h to the location 3F0h twice

write 87h to the location 370h twice

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