CRiSP
Full Member level 2
there is a timing report by synopsys primetime.
*************************************************************
Startpoint: xt_aclk (clock source 'xt_aclk')
Endpoint: ad_a_ad (output port clocked by xt_aclk)
Path Group: xt_aclk
Path Type: max
Point Incr Path
---------------------------------------------------------------
clock xt_aclk (fall edge) 7.50 7.50
xt_aclk (in) 0.00 7.50 f
admx/xt_aclk (ad_mux) 0.00 7.50 f
admx/U1/z (mx21d3) 0.41 7.91 r
admx/ad_a_ad (ad_mux) 0.00 7.91 r
ad_a_ad (out) 0.00 7.91 r
data arrival time 7.91
clock xt_aclk (rise edge) 15.00 15.00
clock network delay (ideal) 0.00 15.00
output external delay -11.00 4.00
data required time 4.00
---------------------------------------------------------------
data required time 4.00
data arrival time -7.91
---------------------------------------------------------------
slack (VIOLATED) -3.91
*************************************************************
Startpoint is rising by xt_clk,however Endpoint is falling edge by xt_aclk .
how to improve it ?
does it has any effect?
*************************************************************
Startpoint: xt_aclk (clock source 'xt_aclk')
Endpoint: ad_a_ad (output port clocked by xt_aclk)
Path Group: xt_aclk
Path Type: max
Point Incr Path
---------------------------------------------------------------
clock xt_aclk (fall edge) 7.50 7.50
xt_aclk (in) 0.00 7.50 f
admx/xt_aclk (ad_mux) 0.00 7.50 f
admx/U1/z (mx21d3) 0.41 7.91 r
admx/ad_a_ad (ad_mux) 0.00 7.91 r
ad_a_ad (out) 0.00 7.91 r
data arrival time 7.91
clock xt_aclk (rise edge) 15.00 15.00
clock network delay (ideal) 0.00 15.00
output external delay -11.00 4.00
data required time 4.00
---------------------------------------------------------------
data required time 4.00
data arrival time -7.91
---------------------------------------------------------------
slack (VIOLATED) -3.91
*************************************************************
Startpoint is rising by xt_clk,however Endpoint is falling edge by xt_aclk .
how to improve it ?
does it has any effect?