UPF低功耗实现系列博客——4 UPF低功耗工作模式编码

2024-11-06

low power

Power State 介绍

定义：电源状态表定义了设计运行期间可以同时存在的合法状态组合

由其电源端口的一组开关状态和电压电平组成
用于综合、分析和优化

编码风格：

supply port based
- UPF 1.0 style, deprecated in UPF2.1, not recommended
- Use add_port_state/create_pst/add_pst
supply set based：
- UPF 2.0 and 2.1, use add_power_state, recommanded style
mixed style：
- UPF 2.0 and 2.1, synopsys style, not recommended

Supply Port Based coding style

add_port_state VDD -state{high 1.2}

add_port_state VDD_Block \
    -state {high 1.2} \
    -state {low 1.0}

add_port_state VSS -state{gnd 0}

create_pst PST -supplies {VDD VDD_Block VSS}
add_pst ALL_HIGH -pst PST -state {high high gnd}
add_pst PARTIAL_HIGH -pst PST -state {high low gnd}

Supply Set Based coding style

# Supply Set Level
add_power_state SS_VDD_VSS \
    -state HIGH {-supply_expr {power == {FULL_ON 1.2} && ground == {FULL_ON 0}}} -simstate NORMAL 

add_power_state SS_VDD_Block_VSS \
    -state HIGH {-supply_expr {power == {FULL_ON 1.2} && ground == {FULL_ON 0}}} -simstate NORMAL \
    -state LOW {-supply_expr {power == {FULL_ON 1.0} && ground == {FULL_ON 0}}} -simstate NORMAL

# System Level
add_power_state PD_Top \
    -state ALL_HIGH {-logic_expr {SS_VDD_VSS == HIGH && SS_VDD_Block_VSS == HIGH}} \
    -state PARTIAL_HIGH {-logic_expr {SS_VDD_VSS == HIGH && SS_VDD_Block_VSS == LOW}}

Mixed Style

add_power_state SS_VDD_VSS \
    -state HIGH {-supply_expr {power == {FULL_ON 1.2} && ground == {FULL_ON 0}}} -simstate NORMAL 

add_power_state SS_VDD_Block_VSS \
    -state HIGH {-supply_expr {power == {FULL_ON 1.2} && ground == {FULL_ON 0}}} \
    -state LOW {-supply_expr {power == {FULL_ON 1.0} && ground == {FULL_ON 0}}} \
    -simstate NORMAL

create_pst -supplies {SS_VDD_VSS.power SS_VDD_Block_VSS.power SS_VDD_VSS.ground}
add_pst ALL_HIGH -pst PST -state {HIGH HIGH GND}
add_pst PARTIAL_HIGH -pst PST -state {HIGH LOW GND}

Off Domain Scenario (1)

Off Domain Scenario Example

add_port_state VDD -state{high 1.2}

add_port_state psw_rule/VDD \
    -state {high 1.2} \
    -state {off off}

add_port_state VSS -state{gnd 0}

create_pst PST -supplies {VDD psw_rule/VDD VSS}
add_pst ALL_HIGH -pst PST -state {high high gnd}
add_pst PARTIAL_HIGH -pst PST -state {high off gnd}

Off Domain Scenario (2)

add_power_state SS_VDD_VSS \
    -state HIGH {-supply_expr {power == {FULL_ON 1.2} && ground == {FULL_ON 0}}} -simstate NORMAL

add_power_state SS_VDD_Block_VSS \
    -state HIGH {-supply_expr {power == {FULL_ON 1.2} && ground == {FULL_ON 0}}} -simstate NORMAL \
    -state OFF {-supply_expr {power == {FULL_OFF 0} && ground == {FULL_OFF 0}}} -simstate CORRUPT

add_power_state PD_Top \
    -state ALL_HIGH {-logic_expr {SS_VDD_VSS == HIGH && SS_VDD_Block_VSS == HIGH}} \
    -state OFF {-logic_expr {SS_VDD_VSS == HIGH && SS_VDD_Block_VSS == OFF}}