FDC37M81 SMSC [SMSC Corporation], FDC37M81 Datasheet - Page 139

• Manufacturer Part Number: FDC37M81
• Description: PC98/99 Compliant Enhanced Super I/O Controller with Keyboard/Mouse Wake-Up
• Manufacturer: SMSC [SMSC Corporation]

Chip Level (Global) Control/Configuration
Registers[0x00-0x2F]
The chip-level (global) registers lie in the
address range [0x00-0x2F]. The design MUST
use all 8 bits of the ADDRESS Port for register
selection. All unimplemented registers and bits
Config Control
Default = 0x00
on VCC POR, VTR
POR and HARD
RESET
Index Address
Default = 0x03
on VCC POR, VTR
POR and HARD
RESET
Logical Device #
Default = 0x00
on VCC POR, VTR
POR and HARD
RESET
REGISTER
0x04 - 0x06 Reserved - Writes are ignored, reads return 0.
ADDRESS
0x03 R/W
0x07 R/W
0x02 W
0x00 -
0x01
Chip (Global) Control Registers
Table 52 - Chip Level Registers
Reserved - Writes are ignored, reads return 0.
The hardware automatically clears this bit after the
write, there is no need for software to clear the bits.
Bit 0 = 1: Soft Reset. Refer to the "Configuration
Registers" table for the soft reset value for each
register.
Bit[7]
= 1
= 0
Bits [6:2]
Reserved - Writes are ignored, reads return 0.
Bits[1:0]
Sets GP index register address when in Run mode
(not in Configuration Mode).
= 11
= 10
= 01
= 00
A write to this register selects the current logical
device.
configuration registers for each logical device.
Note: The Activate command operates only on the
selected logical device.
0xEA (Default)
0xE4
0xE2
0xE0
Enable WDT_CTRL and SMI Enable and
SMI Status Register access when not in
configuration mode
Disable WDT_CTRL and SMI Enable and
SMI Status Register access when not in
configuration mode (Default)
This allows access to the control and
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ignore writes and return zero when read.
The INDEX PORT is used to select a
configuration register in the chip.
PORT is then used to access the selected
register. These registers are accessible only in
the Configuration Mode.
DESCRIPTION
The DATA
STATE
C
C