Specifications

CHAPTER 9: TIMING CLOSURE
USING THE TIMING CLOSURE FLOORPLAN
ALTERA CORPORATION INTRODUCTION TO QUARTUS II ■ 163
You can customize the way the Timing Closure floorplan displays
information using options available from the View menu. You can show the
device by package pins and their function; by interior MegaLAB
™
structures,
LABs, and cells; by regions of the chip; and by the name and location of
selected signals.
You can also use the Field View command (View menu) to display the major
classifications of device resources in a high-level outline view in the Timing
Closure floorplan. Assignments are represented in the Field view by colored
areas that indicate the amount of user-assigned, Fitter-placed, and
unassigned logic per structure in the device. You can use the information in
the Field view to make assignments to achieve timing closure on a design.
Viewing Assignments & Routing
The Timing Closure floorplan can simultaneously show user assignments
and Fitter location assignments. User assignments are all the location and
LogicLock region assignments you have made in the design. Fitter
assignments are the locations where the Quartus II software placed all nodes
after the last compilation. You can show user assignments and Fitter
assignments with the Assignments command (View menu).
The Timing Closure Floorplan allows you to show the device resources and
the corresponding routing information for all design logic. Using the
Routing command (View menu), you can select device resources and view
the following types of routing information:
■ Paths between nodes: display the connection between selected logic
cells, I/O cells, embedded cells, and pins that feed one another.
■ Node fan-in and fan-out: display node fan-in and fan-out routing
information for selected embedded cells, logic cells, I/O cells, and pins.
■ Routing delays: display routing delays to or from specific logic cells,
I/O cells, embedded cells, or pins; between selected nodes; or along one
or more critical paths.
■ Connection counts: show or hide the number of connections to a
selected object, from a selected object, or between selected objects.
■ Physical timing estimates: displays the approximate delay from one
physical resource to another physical resource. Once you select a
physical resource, the delay is represented graphically by the shade of