NanDigits Design Automation

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3.4. Replace Cells.

• Select the cell needs to be replaced. AO22X1 in this case. Press 'Replace cells' button.

• Select AND4X8 in Cell Selection window.

• The left column is the replacing cell pins list. The right columns are connections selections. If the replacing cell and the replaced cell have same pins, the replacing pins will connect to the replaced cell's pins' existing connections by default.

• Since AND4X8 has different pins from AO22X1, you have to manually select connections otherwise some pins are undriven. The following shows A->A0 B->A1 C->B0 D->B1.

• Click Ok of above window, the AO22X1 is replaced by AND4X8 as following shows.

• If you would like to connect the replacing AND4X8's A pin to n1448, you can select 'Driven by' checkbutton and type n1448 in the entry. Or click the entry to activate the entry, then click U891's output pin n1448. n1448 will fill in the entry automaticlly.

• The following shows the replacement and new connections.

• You can replace latch cell TLATX1 by a reset/set one.

• And select RN, SN pins to some nets.

• The result is shown as below.

• #Replacement test
• current_design fogwhatr
• remove_cell shcright_reg_0_
• remove_cell U830
• create_cell U830 artisan_tsmc90lp_hv.synth/AND4X8
• create_cell shcright_reg_0_ artisan_tsmc90lp_hv.synth/TLATSRX4
• connect_net [get_nets n1471] [get_pins U830/D]
• connect_net [get_nets n1448] [get_pins U830/A]
• connect_net [get_nets shcright[0]] [get_pins U830/C]
• connect_net [get_nets n1532] [get_pins U830/Y]
• connect_net [get_nets n1470] [get_pins U830/B]
• connect_net [get_nets datain[0]] [get_pins shcright_reg_0_/D]
• connect_net [get_nets shcright[0]] [get_pins shcright_reg_0_/Q]
• connect_net [get_nets n1081] [get_pins shcright_reg_0_/G]
• connect_net [get_nets resetn] [get_pins shcright_reg_0_/RN]
• connect_net [get_nets resetn] [get_pins shcright_reg_0_/SN]

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