w83977tf Winbond Electronics Corp America, w83977tf Datasheet - Page 85

• Manufacturer Part Number: w83977tf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

8. PLUG AND PLAY CONFIGURATION
The
different types of configurations. In W83977TF, there are nine Logical Devices
0 to Logical Device A with the exception of logical device 4 and 6 for compatibility)
to nine individual functions:
UART2 (logical device 3), KBC (logical device 5), GPIO1 (logical device 7), GPIO2 (logical device 8),
GPIO3 (logical device 9), and ACPI ((logical device A).
configuration registers (above CR30). Host can access those registers
logical device number into logical device select register at
8.1
8.1.1 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
W83977TF
Compatible PnP
0
1
uses Compatible PNP protocol to access configuration registers for setting up
write 87h to the location 3F0h twice
write 87h to the location 370h twice
FDC (logical device 0), PRT (logical device 1), UART1 (logical device 2),
address and value
-75 -
CR7.
Each Logical Device has its own
Publication Release Date:March 1998
by writing an appropriate
W83977TF
PRELIMINARY
(from Logical Device
which correspond
Revision 0.62