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Revision 0.6

8

W83301R

Preliminary

7.2 ACPI State Control

In order to meet the ACPI specification, the W83301R implement a state machine as

shown as Figure 5 to generate ACPI-compliant power state transition.

There are only five states in the state machine cause the W83301R only focus on the

memory ACPI control, and the five states are G3 (Mechanical-Off State), S0 (Full-Power

each STR output.

In the state machine, when the power on, and the 5V input from power supply arrive

output, the other one is S3#=1 and S5#=1 the system will enter S1 state.

outputs into S0 state will S3#=1 and S5#=1.

When the system under the S0 state, the system should enter the S3-sleeping

(S3#=0, S5#=1) or S5-soft off (S5#=0) state when the system idle for a long time or user

power-off.

When the system suspend to RAM, the system will be wakeup and enter S0-full

power state by (S3#=1, S5#=1,PWOK=1), or get into S5-sleeping soft off state by

(S5#=0)

Table 2. W83301R Outputs Table

State

STR1

STR2

STR3

LUV Activity *

G3

Off

Off

Off

Off

No

Off

Off

Off

Off

No

On

(Driven by

Off

Off

Off

No

S0

On

(Driven by

On

On

On

Yes

S3

On

(Driven by

On

On

On

Yes

*When the STR2 & STR3 configured as bus termination controller, only STR1 has linear under voltage

function.