FDC37M81x SMSC Corporation, FDC37M81x Datasheet - Page 116
FDC37M81x
Manufacturer Part Number
FDC37M81x
Description
PC98/99 Compliant Enhanced Super I/O Controller
Manufacturer
SMSC Corporation
Datasheet
1.FDC37M81X.pdf
(198 pages)
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The Watchdog Timer Control, SMI Enable and
SMI Status Registers can be accessed by the host
when the chip is in the normal run mode if CR03
Bit[7]=1.
register to access these registers. The Power on
default GP Index and Data registers are 0xEA and
0xEB respectively. In configuration mode the GP
Index address may be programmed to reside on
addresses 0xE0, 0xE2, 0xE4 or 0xEA. The GP
Data address is automatically set to the Index
address + 1. Upon exiting the configuration mode
the new GP Index and Data registers are used to
access
The host uses GP Index and Data
REGISTER
GP Index
GP Data
Table 46A - GP Index and Data Register
Index address + 1
ADDRESS (R/W)
0xE0, E2, E4, EA
GP INDEX REGISTERS
116
registers WDT_CTRL, SMI Enable and SMI Status
Registers.
To access these registers when in normal (run)
mode, the host should perform an IOW of the
Register Index to the GP Index register (at 0xEX)
to select the Register and then read or write the
Data register (at Index+1) to access the register.
The WDT_CTRL, SMI Enable and SMI Status
registers can also be accessed by the host when
in the configuration state through Logical Device 8.
Access to Watchdog Timer
Control, SMI Enable and
SMI Status Registers (see
Table 46B)
NORMAL (RUN) MODE
0x01-0x0F
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