Table of Contents
2.1i Constraints
M1 Design Flow
What Needs Constraining?
Types of constraints supported
Where do Constraints go?
Brief Review of Constraint Flow
Timing Constraints (I)
Period Constraints
The Period Constraint
Period Path Tracing
Period and Two-Phase Clocks
Period and RAM
Period Examples
I/O Timing: Offset
Specify I/O Timing
The OFFSET IN - ‘BEFORE’ constraint
The OFFSET IN - ‘AFTER’ constraint
The OFFSET OUT - ‘AFTER’ constraint
The OFFSET OUT - ‘BEFORE’ constraint
OFFSET Constraints in 2.1i
Clock Register Groups in OFFSET
Data Path Groups in OFFSET
OFFSET Examples (1)
OFFSET Examples (2)
Synopsys Support for PERIOD and OFFSET
Timing Constraints (II)
Timing Path Keywords
Basic Global Timing Constraints ( using the FROM-TO Syntax)
Basic Global Timing Constraints ( using the FROM-TO Syntax)
Using TNM to create Groups
Using TNM to create Groups.
Using TNM_NET to create Groups
Multi-Cycle Delays Grouping by net name
Multi-Cycle Delays Grouping by instance name
Slow Exceptions
Slow Exceptions: Multi-Cycle Delays with Clock Enables
Specific Delays from one group to another
Specific Delays going through specific logic (TPTHRU)
Specific Delays Excluding Logic
Constraining Between Rising & Falling Clock Edges
Constraining Between Multiple Clock Domains
Creating new synchronous points (TPSYNC)
Ignoring Paths (TIG)
Controlling False Paths (TPTHRU)
Timing Constraint Priority (1)
Timing Constraint Priority (2)
Timing Constraint Priority (3)
SKEW
SKEW (II)
MAXSKEW: Limiting SKEW
Reporting SKEW in TRACE
Prorating Constraints
Placement & Other Constraints
Pin Location Constraints
Other Location Constraints
Prohibit Location Constraints
Mapping Constraints
Implementation Constraints
Conclusion
Basic constraints file
More specific constraints file
More specific constraints file (cont.)
ISSUES to be aware of
ISSUES to be aware of (II)
ISSUES to be aware of (III)
Summary
Technical Tips Web Page
Timing & Constraints Web Page
Documentation
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