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Instead of MUXCY/XORCY use CARRY4 (with timing)

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Eddie Hung 2019-05-21 16:19:45 -07:00
parent 0f094fba08
commit ee8435b820
4 changed files with 20 additions and 11 deletions
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22
techlibs/xilinx/abc.box
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@ -1,5 +1,4 @@
# Max delays from https://pastebin.com/v2hrcksd
# from https://github.com/SymbiFlow/prjxray/pull/706#issuecomment-479380321
# Max delays from https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf
# F7BMUX slower than F7AMUX
# Inputs: I0 I1 S0
@ -12,8 +11,17 @@ F7BMUX 1 1 3 1
MUXF8 2 1 3 1
104 94 273
MUXCY 3 1 3 1
1 1 1
XORCY 4 1 2 1
1 1
# 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
271 157 228 114 222 334 239 313
536 494 592 580 482 598 584 642
379 465 540 526 - 407 556 615
- 445 520 507 - - 537 596
- - 356 398 - - - 438
- - - 385 - - - -
340 433 512 508 223 400 523 582
- 469 548 528 - 205 558 618
- - 292 376 - - 226 330
- - - 380 - - - 227