HC210 datasheet(111/228 Pages) ALTERA

111 / 228 page

Altera Corporation

5–19

September 2008

Performing ECOs with Change Manager and Chip Planner

■

The first compilation after migration to a companion device requires

a full compilation (all partitions are compiled), but subsequent

compilations can be incremental if changes to the source RTL are not

required. For example, PLL phase changes can be implemented

incrementally if the blocks are partitioned.

■

The entire design must be migrated between Stratix II and

HardCopy II companion devices. The Quartus II software does not

support migration of partitions between companion devices.

■

Bottom-up Quartus II Incremental Compilation is not supported for

HardCopy II devices.

■

Physical Synthesis can be run on individual partitions within the

originating device only. The resulting optimizations are preserved in

the migration to the companion device.

For information about using Quartus II Incremental Compilation, refer

to the Quartus II Incremental Compilation for Hierarchical and Team-Based

Design chapter in volume 1 of the Quartus II Handbook.

Maximum Fanout Assignments

This feature is supported beginning in Quartus II 6.1. In order to meet

timing, it may be necessary to limit the number of fanouts of a net in your

design. You can limit the maximum fanout of a given net by using this

feature.

For example, you can use the following Tcl command to enable the

maximum fanout setting:

set_instance_assignment -name MAX_FANOUT <number>

- to\ <net name>

For example, if you want to limit the maximum fanout of net called

"m3122_combout_1" to 25, the Tcl command is as follows:

set_instance_assignment -name MAX_FANOUT 25 -to\

m3122_combout_1

Performing

ECOs with

Change

Manager and

Chip Planner

As designs grow larger and larger in density, the need to analyze the

design for performance, routing congestion, logic placement, and

executing Engineering Change Orders (ECOs) becomes critical. In

addition to design analysis, you can use various bottom-up and

top-down flows to implement and manage the design. This becomes

difficult to manage since ECOs are often implemented as last minute

changes to your design.

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