Hello, thanks for your answer, do you mean that I should add such power selection to every instantiated unit in user_project_wrapper, for example my previous sram becomes

sky130_sram_1kbyte_1rw1r_32x256_8 iram_inst_A (

``ifdef USE_POWER_PINS`

.vccd1(vccd1),  // User area 1 1.8V power

.vssd1(vssd1),  // User area 1 digital ground

``endif` I did such thing but the lvs error become more.