NanDigits Design Automation

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Insert Gate

• ECO gates can be inserted into connections between gates. For example the following n588 net (in red) can be inserted several ECO gates. Select the connection by clicking Mouse-Left-Button on it. Press 'Insert gates into connections' button.

• Type in the gate number to be inserted.

• In ECO Gate select window, select INVX2

• Select complete Loop since the gate is inserted into the connection

• Two INVX2 are inserted as following. The gate positions can be adjusted any time for readability

• You can add other type of gate which has more than one inputs. For example AND cell.

• In Connectivity selection window, Y and A are default set to 'Complete Loop', B's default is 'Undriven'. You can choose 'Driven by' option. And in the entry, type in the net name. Or use fast way, click Mouse-Left-Button in the entry to activate it, click Mouse-Left-Button on the net that should drive B, n256 in this case. 

• AND2X4 is inserted with the connections specified above.

• Use Mouse-Right-button to get popup menu and select 'Edit gate'. Change instance name and add some comments.

• The instance is changed and comments are added as the following figure shown.

• Save ECO. And check ECO. Tcl format is listed below.
• current_design TM_qciflt
  disconnect_net [get_nets n588] [get_pins "U435/B"]
  create_net bug_675496_n588_2
  create_cell bug_675496_ECOCELL_0 tsmc65_hvt/AND2X4
  connect_net [get_nets n588] [get_pins "bug_675496_ECOCELL_0/A"]
  connect_net [get_nets n256] [get_pins "bug_675496_ECOCELL_0/B"]
  connect_net [get_nets bug_675496_n588_2] [get_pins "bug_675496_ECOCELL_0/Y"]
  connect_net [get_nets bug_675496_n588_2] [get_pins "U435/B"]