PC87366 datasheet(55/240 Pages) NSC

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2.0 Device Architecture and Configuration (Continued)

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2.8.12

SuperI/O Configuration D Register (SIOCFD)

This is a battery-backed register.

Location:

Index 2Dh

Type:

Varies per bit

Bit

76543210

Name

LED Polarity

Control

Last PSON

State

PSON

Polarity

Crowbar Timeout

Resume

Last PSON

State

Power

Supply Off

Power

Button

Mode

Reset

Strap

11000

Bit

Description

LED Polarity Control. This is a R/W bit. It determines if the LED outputs are active high or active low when

they are lit.

0: Active high (default at VSB power-up reset)

1: Active low

Last Power Supply On State. This is a RO bit. When operating in Legacy mode (bit 0 of this register is set to 0), this

bit reflects the state of the PSON pin sampled during the last power failure (no VSB), regardless of the polarity of PSON.

0: Off

1: On

Power Supply On Polarity. This is a RO bit. The polarity of PSON is determined during VSB power-up by the

PSONPOL strap.

4-3

Crowbar Timeout. This is a R/W bit.

Bits

5 4

Value (Seconds)

0 0

0.5 to 0.75

0 1

1.0 to 1.25

1 0

1.25 to 1.5

1 1

2.0 to 2.25 (default at VPP power-up reset)

Resume Last Power Supply On State. This is a R/W bit. When it is set to 1, PSON resumes its last state, sampled

during the last power failure, after power returns. When this bit is set to 0, the PSON state is determined by the

SLPS3 state.

0: SLPS3 (default at VPP power-up reset)

1: Last PSON state. For correct operation, the system’s ACPI controller must be conﬁgured to resume to OFF.

This enables the power supply control logic to know the state of the chipset ACPI state machine after power

failure (no VDD and VSB).

Power Supply Off. This is a R/W bit. It always returns 0 when read. When using Legacy mode (bit 0 is set to

0) and setting this bit to 1, this bit inactivates the PSON output, thereby shutting off the power supply.

0: No action (default at VPP power-up reset)

1: Inactivate PSON in Legacy mode

Power Button Mode. This is a R/W bit.

0: Legacy (default at VSB power-up reset)

1: ACPI

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