[Tutorial] Obtain Objects in the collection in Genus Using Tcl

Published: March 06, 2023 by SingularityKChen (Last updated: March 14, 2023 )

• Categories:
• Tutorial 20

• Tags:
• Cadence 5
• Genus 4
• Tcl 2

• Obtain Objects in the collection in Genus Using Tcl
  • Introduction
  • Access collection
  • Examples

Obtain Objects in the collection in Genus Using Tcl

Introduction

collection is an extension provided by EDA vendors like Synopsys to support a list of objects in their Tcl API. Usually, most database query operations in Cadence and Synopsys would return a collection object.

For instance, the following Cadence Genus command would return a hex value, which is assigned to the variable $reg_collection.

genus> set reg_collection [all_registers -clock clk]
0x123

Access collection

To access the objects of the collection, these commands could be used in Cadence Genus:

get_cell get_cells get_db

Examples

Complex query operations with filters may be slow in large design. Pre-store the query results might reduce runtime when it will be used in multiple places.

set reg_collection [all_registers -clock clk]
report_timing -from [all_inputs] -to [get_db $reg_collection]
report_timing -from [get_db $reg_collection] -to [get_db $reg_collection]
report_timing -from [get_db $reg_collection] -to [all_outputs]