Design Compiler Objects

Design Objects

• Verilog 입장
  port(=clock), pin, net, cell이 있음.

• Schematic 입장
  port, clock, cell, net, design, pin이 있음.

Ports versus Pins

• 'Ports' are the inputs and outputs of the current design
• 'Pins' are the inputs and outputs of any cell that is instantiated in the current design

→ 현재 디자인에 따라 Port가 Pin이 될 수도 있음

get_* Commands

• get_nets : current design의 net들. -hier로 sub-block도 가능
• get_pins <cell/pin> : cell들의 input/output pins. -hier로 sub-block 가능
• get_ports : current design의 input/output/bidir ports. -hier 가능
• get_cells : cells(instances) in the current design. -hier 로 sub-blocks도 가능
• get_clocks : current design이나 above design에서 정의된 clock object
• get_designs : DC memory에 있는 designs

• get_libs : DC memory에 있는 libraries
• get_lib_cells <libname/cellname> : library 안에 있는 cell들
• get_lib_pins <libname/cellname/pinname> : library 안에 있는 cell의 pin들

all_* Commands

arguments 없음

• all_inputs : current design의 모든 input, inout ports
• all_outputs : current design의 모든 output, inout ports
• all_clocks : current design과 below에서 정의된 clock들
• all_registers : 현재 디자인의 register cell들의 hierarchy

• all_ideal_nets
• all_fanin
• all_fanout
• all_connected
• all_dont_touch
• all_high_fanout

그 외

• query_objects : 정보 보기
• sizeof_collection : 개수
• filter_collection [get_cells *] "ref_name =~ AN*" : 해당 조건에 만족하는 것들만
• get_cells * -filter "dont_touch == true : 해당 조건에 만족하는 것들만
• list_attributes -application -class <object_type> : attribute 확인

모르겠는거 man으로 찾아보기

활용

set_driving_cell 5 [remove_from_collection [all_inputs] [get_ports CLK]]
set fastclks [get_clocks * -filter "period < 10"]
get_cells -hier -filter "is_unmapped != true"
foreach_in_collection cell [get_cells -hier * -filter "is_heirarchical == true"] {echo "Instance [get_object_name $cell] is hierarchical"}

Objects and Attributes

Object 종류
design, port, pin, cell, net, clock, lib, reference, cluster, bag

• Ports' attributes
  direction, driving_cell_rise, load, max_capacitance, ...
• Cells' attributes
  dont_touch, is_hierarchical, is_mapped, is_sequential, ...

Collection과 list

• Tcl lists are structures to store user-defined data
• Collections are used to access database data

collection을 반환하는 commands들은 list용 명령어 안됨

• add_to_collection : Add object(s)
• compare_collections : compares two collections
• copy_collection : Make a copy of collection
• filter_collection : Filter a collection, resulting in a new collection
• foreach_in_collection : Iterate over a collection
• index_collection : Extract object from collection
• remove_from_collection : Remove object(s) from a collection
• sizeof_collection : Number of objects in a collection
• sort_collection : Create a sorted copy of a collection