The power save mode for MAX 3000A devices is set in your development tool (Quartus II or MAX+PLUS II).

Although it can be set for the entire design, by setting fast and slow operation individually for each entity, power consumption can be reduced while maintaining the operating speed of high-speed functions.
The option name is "Turbo Bit".
・ Turbo Bit = ON ⇒ High speed mode
・ Turbo Bit = OFF ⇒ Low power mode

Other devices that support this option are APEX 20K, APEX 20KC, APEX 20KE, APEX II, MAX 7000AE, MAX 7000B, MAX 7000S.
 
The setting method is as follows. Execute compilation after setting.

Quartus II settings
▼ Set for entire design
1. Select Assignments menu ⇒ Settings.
2. Select Fitter Settings from Category.
3. Click the More Settings button.
4. Select the "Auto Turbo Bit" option in the Existing option settings column.
Double-click the Setting item and select On/Off from the pull-down list.
5. Click all OK buttons to complete the settings.
 
▼ Set to Specific Entity (Individually)
1. From the Project Navigator hierarchy tree, select the desired entity by right-clicking, and select
Select Locate ⇒ Locate in Assignments Editor. (The entity name appears in the To column,
The Assignment Editor will launch. )
2. Double-click the Assignment Name column of the row displaying the entity name, and select
select the "Turbo Bit" option.
3. Similarly, double-click the Value column and select On/Off.
4. Save the Assignment Editor (File menu ⇒ Save) to complete the settings.
 
MAX+PLUS II settings
▼ Set for entire design
1. Select Assign menu ⇒ Global Project Logic Synthesis.
2. Click the Define Synthesis Style button.
3. Set the "Turbo Bit" option to On (checked) or Off (unchecked).
4. Click all OK buttons to complete the settings.

▼ Set to Specific Entity (Individually)
1. Select MAX+plus II Menu ⇒ Hierarchy Display.
2. Right-click the desired entity and select Assign ⇒ Logic Options from the pull-down menu.
increase.
3. Click the Individual Logic Options button and set the "Turbo Bit" option to On (checked) or
Set to Off (unchecked) or default (gray).
4. Click all OK buttons to complete the settings.