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| author | Eddie Hung <eddie@fpgeh.com> | 2019-12-31 15:25:46 -0800 |
|---|---|---|
| committer | Eddie Hung <eddie@fpgeh.com> | 2019-12-31 15:25:46 -0800 |
| commit | 6b825c719b5bf6f63d3397cfadf8293b5d14dde6 (patch) | |
| tree | 005167afc45c83ce3729cab51d72e423bf2ca36a /techlibs/xilinx | |
| parent | 4cdba00e25d892b90c0ee48716c17dec60e472db (diff) | |
| download | yosys-6b825c719b5bf6f63d3397cfadf8293b5d14dde6.tar.gz yosys-6b825c719b5bf6f63d3397cfadf8293b5d14dde6.tar.bz2 yosys-6b825c719b5bf6f63d3397cfadf8293b5d14dde6.zip | |
Update abc9_xc7.box comments
Diffstat (limited to 'techlibs/xilinx')
| -rw-r--r-- | techlibs/xilinx/abc9_xc7.box | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/techlibs/xilinx/abc9_xc7.box b/techlibs/xilinx/abc9_xc7.box index 16606d14e..67523124a 100644 --- a/techlibs/xilinx/abc9_xc7.box +++ b/techlibs/xilinx/abc9_xc7.box @@ -1,8 +1,9 @@ # Max delays from https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf # https://github.com/SymbiFlow/prjxray-db/blob/23c8b0851f979f0799318eaca90174413a46b257/artix7/timings/slicel.sdf -# NB: Inputs/Outputs must be ordered alphabetically -# (with exceptions for carry in/out) +# NB: Box inputs/outputs must each be in the same order +# as their corresponding module definition +# (with exceptions detailed below) # Average across F7[AB]MUX # Inputs: I0 I1 S0 @@ -15,7 +16,7 @@ MUXF7 1 1 3 1 MUXF8 2 1 3 1 104 94 273 -# Box containing MUXF7.[AB] + MUXF8, +# Box containing MUXF7.[AB] + MUXF8 # Necessary to make these an atomic unit so that # ABC cannot optimise just one of the MUXF7 away # and expect to save on its delay @@ -27,8 +28,8 @@ $__MUXF78 3 1 6 1 # CARRY4 + CARRY4_[ABCD]X # Inputs: CYINIT DI0 DI1 DI2 DI3 S0 S1 S2 S3 CI # Outputs: O0 O1 O2 O3 CO0 CO1 CO2 CO3 -# (NB: carry chain input/output must be last -# input/output and the entire bus has been +# (Exception: carry chain input/output must be the +# last input and output and the entire bus has been # moved there overriding the otherwise # alphabetical ordering) CARRY4 4 1 10 8 @@ -53,55 +54,54 @@ $__ABC9_ASYNC0 1000 1 2 1 $__ABC9_ASYNC1 1001 1 2 1 0 764 -# Max delays from https://github.com/SymbiFlow/prjxray-db/blob/23c8b0851f979f0799318eaca90174413a46b257/artix7/timings/slicel.sdf#L237-L251 -# https://github.com/SymbiFlow/prjxray-db/blob/23c8b0851f979f0799318eaca90174413a46b257/artix7/timings/slicel.sdf#L265-L277 +# Flop boxes: +# * Max delays from https://github.com/SymbiFlow/prjxray-db/blob/23c8b0851f979f0799318eaca90174413a46b257/artix7/timings/slicel.sdf#L237-L251 +# https://github.com/SymbiFlow/prjxray-db/blob/23c8b0851f979f0799318eaca90174413a46b257/artix7/timings/slicel.sdf#L265-L277 +# * Exception: $abc9_currQ is a special input (located last) necessary for clock-enable functionality -# NB: Inputs/Outputs must be ordered alphabetically -# (with exception for \$currQ) - -# Inputs: C CE D R \$currQ +# Inputs: C CE D R $abc9_currQ # Outputs: Q FDRE 1100 1 5 1 #0 109 -46 404 0 0 109 0 404 0 # Clamp -46ps Tsu -# Inputs: C CE D R \$currQ +# Inputs: C CE D R $abc9_currQ # Outputs: Q FDRE_1 1101 1 5 1 #0 109 0 -46 404 0 109 0 0 404 # Clamp -46ps Tsu -# Inputs: C CE CLR D \$currQ +# Inputs: C CE CLR D $abc9_currQ # Outputs: Q FDCE 1102 1 5 1 #0 109 764 -46 0 0 109 764 0 0 # Clamp -46ps Tsu -# Inputs: C CE CLR D \$currQ +# Inputs: C CE CLR D $abc9_currQ # Outputs: Q FDCE_1 1103 1 5 1 #0 109 764 -46 0 0 109 764 0 0 # Clamp -46ps Tsu -# Inputs: C CE D PRE \$currQ +# Inputs: C CE D PRE $abc9_currQ # Outputs: Q FDPE 1104 1 5 1 #0 109 -46 764 0 0 109 0 764 0 # Clamp -46ps Tsu -# Inputs: C CE D PRE \$currQ +# Inputs: C CE D PRE $abc9_currQ # Outputs: Q FDPE_1 1105 1 5 1 #0 109 -46 764 0 0 109 0 764 0 # Clamp -46ps Tsu -# Inputs: C CE D S \$currQ +# Inputs: C CE D S $abc9_currQ # Outputs: Q FDSE 1106 1 5 1 #0 109 -46 446 0 0 109 0 446 0 # Clamp -46ps Tsu -# Inputs: C CE D S \$currQ +# Inputs: C CE D S $abc9_currQ # Outputs: Q FDSE_1 1107 1 5 1 #0 109 -46 446 0 |