* Digital PLL testbench

.include "pshort_tt.cor"
.include "nlowvt_tt.cor"

.include "digital_pll.spi"

.option TEMP=27
* .option RELTOL=1.0E-2

* Instantiate the digital PLL

X0 reset osc clkp0 clkp1 div0 div1 div2 div3 div4
+ clkd2 clkd4 clkd8 clkd16 vdd vss digital_pll

* Power supply (note that all logic is 1.8V here)

V0 vdd vss PWL(0.0 0.0 25n 1.8)
V1 vss 0 0.0

* Fixed divider value (connect resistors to power or ground)
* divider value = 16  (10MHz * 16 = 160MHz clock)

R0 div4 vdd 1
R1 div3 gnd 1
R2 div2 gnd 1
R3 div1 gnd 1
R4 div0 gnd 1

* Run oscillator at 10MHz
* Because DFFs don't handle reclocking well, keep the edges sharp.

V2 osc vss PULSE(0.0 1.8 5n 10p 10p 50n 100n)

* Reset pulse
V3 reset vss PWL(0.0 1.8 0.1u 1.8 0.101u 0.0)

* Transient analysis.  Note that trim updates every four cycles, or about
* three updates per microsecond.  To update all 17 trim bits requires
* 6us.

.control
tran 1n 8u
plot V(osc) V(clkd16)
plot V(clkp0) V(clkp1)
.endc
.end