Ambit BuildGates Synthesis User Guide
Optimizing with Logic Transforms
Table 8-3 Transforms—Improve the Logic Speed of Critical Paths, continued
Transform |
Description |
do_xform_timing_correction Iteratively performs the following timing optimization transformations.
do_xform_reclaim_area do_xform_buffer do_xform_resize do_xform_clone
do_xform_fix_design_rule_violations do_xform_fix_hold
The table below contains the transforms that perform specific applications.
Table 8-4 Transforms—Perform Specific Applications
Transform |
Description |
|
|
do_xform_fix_design_rule_ |
Fixes only design rule violations. This transform |
violations |
may impact the critical slack, but will solve design |
|
rule violations without impacting slack if at all |
|
possible. |
|
|
do_xform_fix_hold |
Fixes hold (early slack) violations with minimal |
|
impact on setup (late slack) violations. |
|
|
do_xform_fix_multiport_net |
Adds logic to ensure that no “assign” statements |
|
appear in the netlist for nets which drive two ports |
|
or pass-through wires from input port to output |
|
port. |
|
|
do_xform_footprint |
This transform is similar to resizing but limited to |
|
cells which have the same footprint in the library. |
|
|
Summary Listing of Transform Commands
Table 8-5 groups the transforms by the representations or stages of the design in which they work. ATL is the abbreviation for Ambit Technology Library (generic logic) and TSC is the abbreviation for Technology-Specific Cells (library elements).
September 2000 |
182 |
Product Version 4.0 |
Ambit BuildGates Synthesis User Guide
Optimizing with Logic Transforms
Table 8-5 Transform Command Summary List
Command |
Description |
|
|
ATL -> ATL |
do_xform_propagate_constant |
|
do_xform_structure |
|
do_xform_remove_redundancy |
|
do_xform_optimize_generic |
|
|
ATL -> TSC |
do_optimize |
|
do_xform_map |
|
|
TSC -> TSC |
do_optimize |
|
do_xform_timing_correction |
|
do_xform_propagate_constant |
|
do_xform_reclaim_area |
|
do_xform_buffer |
|
do_xform_clone |
|
do_xform_restructure |
|
do_xform_fix_design_rule_violations |
|
do_xform_fix_hold |
|
do_xform_footprint |
|
do_xform_resize |
|
do_xform_optimize_slack |
|
do_xform_fast_optimize |
|
do_xform_buffer_tree |
|
|
TSC -> ATL |
do_xform_unmap |
|
|
September 2000 |
183 |
Product Version 4.0 |
Ambit BuildGates Synthesis User Guide
Optimizing with Logic Transforms
September 2000 |
184 |
Product Version 4.0 |