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+# Max delays from https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf
+
+# F7BMUX slower than F7AMUX
+# Inputs: I0 I1 S0
+# Outputs: O
+F7BMUX 1 1 3 1
+217 223 296
+
+# Inputs: I0 I1 S0
+# Outputs: O
+MUXF8 2 1 3 1
+104 94 273
+
+# CARRY4 + CARRY4_[ABCD]X
+# Inputs: CI CYINIT DI0 DI1 DI2 DI3 S0 S1 S2 S3
+# Outputs: CO0 CO1 CO2 CO3 O0 O1 O2 O3
+CARRY4 3 1 10 8
+271 536 379 - - - 340 - - -
+157 494 465 445 - - 433 469 - -
+228 592 540 520 356 - 512 548 292 -
+114 580 526 507 398 385 508 528 378 380
+222 482 - - - - 223 - - -
+334 598 407 - - - 400 205 - -
+239 584 556 537 - - 523 558 226 -
+313 642 615 596 438 - 582 618 330 227
+
+# SLICEM/A6LUT
+# Inputs: A0 A1 A2 A3 A4 A5 D DPRA0 DPRA1 DPRA2 DPRA3 DPRA4 DPRA5 WCLK WE
+# Outputs: DPO SPO
+RAM64X1D 4 0 15 2
+- - - - - - - 124 124 124 124 124 124 - -
+124 124 124 124 124 124 - - - - - - 124 - -
+
+# SLICEM/A6LUT + F7[AB]MUX
+# Inputs: A0 A1 A2 A3 A4 A5 A6 D DPRA0 DPRA1 DPRA2 DPRA3 DPRA4 DPRA5 DPRA6 WCLK WE
+# Outputs: DPO SPO
+RAM128X1D 5 0 17 2
+- - - - - - - - 314 314 314 314 314 314 292 - -
+347 347 347 347 347 347 296 - - - - - - - - - -