參數(shù)資料
型號: W83977TF(EOL)
英文描述: W83877TF plus KBC. CIR. RTC
中文描述: W83877TF加比聯(lián)。稅務(wù)局局長。時鐘
文件頁數(shù): 99/161頁
文件大?。?/td> 592K
代理商: W83977TF(EOL)
W83977EF/ CTF
PRELIMINARY
Publication Release Date: March 1999
-90 -
Revision A1
8.0
PLUG AND PLAY CONFIGURATION
The W83977EF/CTF uses Compatible PNP protocol to access configuration registers for setting up
different types of configurations. In W83977EF/CTF, 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), CIR (logical device 6)
(For
W83977CTF only)
, 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 these
registers by writing an appropriate logical device number into logical device select register at CR7.
8.1
Compatible PnP
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
address and value
0
write 87h to the location 3F0h twice
1
write 87h to the location 370h twice
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