zzczx
Junior Member level 3
I use soc to do apr, but It reported many violated. After read the report, I found it seems the soc encounter doesn't recognize the multicycle path constraint in dc script.
part of dc constrain
soc's report
plz help me to solve this problem. thx
part of dc constrain
Code:
create_clock -name {CLK} -period 14.000000 \
waveform { 0.000000 7.000000 } [get_ports {clk}]
set_input_delay -max 8.700000 -clock {CLK} [get_ports {da}]
set_input_delay -min 7.000000 -clock {CLK} -add_delay \
[get_ports{da}]
set_multicycle_path 2 -setup -end -from [get_clocks {CLK}] \
-through [get_ports {da}]
set_output_delay -max 8.000000 -clock {CLK} [get_ports {db}]
set_output_delay -min 6.000000 -clock {CLK} -add_delay [get_ports {db}]soc's report
Code:
Path #: 1
Startpoint: da
(clocked by CLK R)
Endpoint: db
(clocked by CLK R)
Data required time: 13.400 (minus uncertainty: 0.600 adjusted 1 cycle)
~~~~~~~~~~~
it said 1 cycle ????
Data arrival time: 18.856
Slack: -5.456 (VIOLATED)
Object name Delta r/f (ns) Sum r/f (ns) Slew (ns) Load (pf) Cell Location (um)
--------------------------------------------------------------------------------------------------------------------------
da "set_input_delay" 8.700f/8.700r 8.700f/8.700r
da 0.055f/0.055r 8.755f/8.755r 2.900f/2.900r
u15 A->Y (INVX8) 0.758r/0.300f 9.514r/9.055f 2.900f/2.900r 0.236 (164.40, 123.40)
n163 0.004r/0.004f 9.517r/9.059f
u16 B->Y (NOR2X4) 0.267f/0.500r 9.784f/9.559r 0.669f/0.741r 0.203 (177.00, 161.80)
n164 0.005f/0.005r 9.789f/9.564r
u20 A1->Y (AOI22X2) 0.431r/0.115f 10.220r/9.678f 0.703f/0.965r 0.020 (298.50, 181.00)
n166 0.000r/0.000f 10.220r/9.678f
u21 B0->Y (OAI2BB1X2) 0.076f/0.302r 10.296f/9.980r 0.688f/0.700r 0.017 (259.80, 161.80)
db 0.000f/0.000r 10.296f/9.980r
FE_OFC0_yc_mod_1_ A->Y (BUFX8) 0.242f/0.263r 10.538f/10.243r 0.185f/0.291r 0.149 (266.10, 161.80)
FE_OFN0_yc_mod_1_ 0.004f/0.004r 10.542f/10.247r
u22 A->Y (AND2X4) 0.311f/0.348r 10.853f/10.594r 0.154f/0.261r 0.109 (138.30, 251.40)
db 0.003f/0.003r 10.856f/10.597r
db "set_output_delay" 8.000f/8.000r 18.856f/18.597rplz help me to solve this problem. thx