UPF Guide
Published:
UPF in SOC:
1. Set the level of implementation constraints.
set_design_top SoC/Video_SB #Specify design_top as Video_SB
set_scope . #Specify the scope of the command as the current level, namely Video_SB
set_scope V1/LV1 #Specify the scope of the command as V1/LV1
2. Set the power_domain
There are the following 5 domains and sub_domains under the Video_SB top level
Video_SB/Video_PD, Video_SB/V1_PD, Video_SB/V2_PD, Video_SB/LV12_PD, Video_SB/LV34_PD
The steps to set power_domain are as follows:
set_scope Video_SB # set the scope to Video_SB
create_power_domain Video_PD -include_scope # create Video_PD power domain in current scope.
create_power_domain V1_PD -elements {V1} # creates V1's domain, its own power domain called V1_PD
create_power_domain LV12_PD -elements {V1/LV1 V1/LV2}
create_power_domain V2_PD -elements {V2}
create_power_domain LV34_PD -elements {V2/LV3 V2/LV4}
3. Describe the power network of power_domain: Supply Network
The definition of the power network in the power domain is as follows:
Mainly through the following four for the connection of the power network.
create_supply_port VDD -direction in
create_supply_port VSS -direction in
create_supply_net Pwr -domain Video_PD
create_supply_net Gnd -domain Video_PD
connect_supply_net Pwr -ports (VDD)
connect_supply_net Gnd -ports (VSS)
set_domain_supply_net Video_PD \
-primary_power_net Pwr \
-primary_ground_net Gnd
In the figure below, the supply_net in the V_PD domain multiplexes the supply_net in the Video_PD domain. Requires -reuse to describe
create_supply_net Pwr -reuse -domain V_PD
create_supply_net Gnd -reuse -domain V_PD
At the same time, the power_domain to which the statement net belongs must be displayed.
set_domain_supply_net V_PD \
-primary_power_net Pwr \
-primary_ground_net Gnd
4. Create power_switch
create_supply_net VDDsw -domain V_PD #Define the supply_net generated by switch.
create_power_switch SW -domain V_PD \
-input_supply_port {pwin Pwr } \
-output_supply_prt {pwout VDDsw } \
-control_port {swctrl sw_ctrl } \
-on_state {Pwon swctrl} \
-off_state {Pwoff !swctrl}
set_domain_supply_net V_PD \ #The primary_power_net of V_PD is the net generated by the switch
-primary_power_net VDDsw \
-primary_ground_net Gnd
5. Set the value of Supply Port
add_port_state VDD -state {ON_10 1.0} #VDD has only one normally open state, and its voltage value is 1.0v
add_port_state VSS -state {ON_00 0.0}
add_port_state SW/VDDsw -state {ON_10 1.0} -state {OFF off} #switch switch voltage VDDsw, there are two states of ON and OFF.
6. Description of Power State Table
create_pst PST1 -supplies {VDD, VDDsw, VDD2, VSS}
add_pst_state Normal -pst PST1 -state {ON_10, ON_10, ON_08, ON_00}
add_pst_state Sleep -pst PST1 -state {ON_10, OFF, ON_08, ON_00}
add_pst_state Normal -pst PST1 -state {ON_10, OFF, OFF, ON_00}
7. Set retention quickly restores the status of the shut down domain
The power and ground of the retention cell are red VDD and VSS
set_retention V_PD_retention \ #So the state of V_PD domain can be restored
-domain V_PD \
-retention_power_net Pwr \
-retention_ground_net Gnd
set_retention_control V_PD_retention \
-domain V_PD \
-save_signal{SRctrl posedge} \
-restore_signal{SRctrl negedge}
8. Use isolation cell to isolate ON domain and OFF domain
The output of the OFF domain is connected to the ON domain, so its output needs to be processed.
set_isolation V_PD_isolation \
-domain V_PD \
-applies_to outputs \
-clamp_value 0 \
-isolation_power_net Pwr \
-isolation_ground_net Gnd
set_isolation_control V_PD_isolation \
-domain V_PD \
-isolation_signal vISO \
-isolation_sense high \
-location parent
9. The level shift cell handles the transmission of signals between different voltage domains.
set_level_shifter LV_PD_LS
-domain LV_PD \
-threshold 0.1 \
-applies_to both \
-rule both \
-location self
