Changing between fixed and soft placement, 2 changing between fixed and soft placement – Achronix ACE Version 5.0 User Manual
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Pre-Placing a Design
Chapter 4. Tasks
Changing Between Fixed and Soft Placement
There are two types of placement in ACE: soft and fixed. Fixed placement locks the placement of an instance
to a site such that the placer is not allowed to move the instance to another site. Fixed placement is the only
type of pre-placement command recommended. Soft placement is used as a global placement hint to the
placer.
Note:
Soft placement is not fully functional.
Fixing placement of soft-placement objects
To fix placement with key-strokes:
1. In the Selection (
) section of the
’s fly-out palette, check the object types whose
placement should be fixed.
2. Press and hold the ’f’ key on the keyboard to start a selection rectangle at the current mouse position.
3. Drag the mouse while holding down the ’f’ key on the keyboard to create a selection rectangle which
includes the objects desired. Then, release the key to fix the placement of the enclosed objects.
To select objects with the Selection Tool:
1. Select the Selection Tool (
) from the
’s toolbar. From the Selection section of
the fly-out palette, check the object types whose placement you wish to fix. Also, ensure the Action
control is set to Fix Placement.
2. Click and drag with the left mouse button in the view to create a selection rectangle. Optionally, hold
CTRL
down to add to the selection.
Note:
Not using CTRL will clear the previous selection.
3. Release the mouse button to fix the placement of the activated objects in the selection.
Un-fixing (softening) placement of fixed-placement objects
To un-fix placement with key-strokes:
1. In the Selection (
) section of the
’s fly-out palette, check the object types whose
placement should be un-fixed.
2. Press and hold the ’u’ key on the keyboard to start a selection rectangle at the current mouse position.
3. Drag the mouse while holding down the ’u’ key on the keyboard to create a selection rectangle which
includes the objects desired. Then, release the key to un-fix the placement of the enclosed objects.
To select objects with the Selection Tool:
1. Select the Selection Tool (
) from the
’s toolbar. From the Selection section of
the fly-out palette, check the object types whose placement you wish to fix. Also, ensure the Action
control is set to Un-fix Placement.
2. Click and drag with the left mouse button in the view to create a selection rectangle. Optionally, hold
CTRL
down to add to the selection.
Note:
Not using CTRL will clear the previous selection.
3. Release the mouse button to un-fix the placement of the activated objects in the selection.
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