diff --git a/env/spef-mapping.tcl b/env/spef-mapping.tcl
new file mode 100644
index 0000000..5ac4c83
--- /dev/null
+++ b/env/spef-mapping.tcl
@@ -0,0 +1,13 @@
+set spef_mapping(mprj/u_4x8bit_dac) "$::env(PROJECT_ROOT)/signoff/not-found/dac_top.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/u_intercon) "$::env(PROJECT_ROOT)/signoff/wb_interconnect/openlane-signoff/spef/wb_interconnect.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/u_pinmux) "$::env(PROJECT_ROOT)/signoff/pinmux_top/openlane-signoff/spef/pinmux_top.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/u_pll) "$::env(PROJECT_ROOT)/signoff/dg_pll/openlane-signoff/spef/dg_pll.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/u_qspi_master) "$::env(PROJECT_ROOT)/signoff/qspim_top/openlane-signoff/spef/qspim_top.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/\u_riscv_top.i_core_top_0) "$::env(PROJECT_ROOT)/signoff/ycr_core_top/openlane-signoff/spef/ycr_core_top.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/\u_riscv_top.i_core_top_1) "$::env(PROJECT_ROOT)/signoff/ycr_core_top/openlane-signoff/spef/ycr_core_top.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/\u_riscv_top.i_core_top_2) "$::env(PROJECT_ROOT)/signoff/ycr_core_top/openlane-signoff/spef/ycr_core_top.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/\u_riscv_top.i_core_top_3) "$::env(PROJECT_ROOT)/signoff/ycr_core_top/openlane-signoff/spef/ycr_core_top.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/\u_riscv_top.u_connect) "$::env(PROJECT_ROOT)/signoff/ycr4_iconnect/openlane-signoff/spef/ycr4_iconnect.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/\u_riscv_top.u_intf) "$::env(PROJECT_ROOT)/signoff/ycr_intf/openlane-signoff/spef/ycr_intf.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/u_uart_i2c_usb_spi) "$::env(PROJECT_ROOT)/signoff/not-found/uart_i2c_usb_spi_top.$::env(RCX_CORNER).spef"
+set spef_mapping(mprj/u_wb_host) "$::env(PROJECT_ROOT)/signoff/wb_host/openlane-signoff/spef/wb_host.$::env(RCX_CORNER).spef"