Power Modeling and Analysis using VisualSim Architect

Example

This is an example of the power modeling using a set of standard VisualSim library blocks and a custom behavior flow diagram. The following base system has been selected for the demo. Demo Details

The following has been considered while modeling :-

State Table:

STATE	OFF	SLEEP	2G	3G
PLL	OFF	ON	ON	ON
CLKMUX	OFF	SLEEP	2G	3G
2G	OFF	OFF	ACTIVE	SLEEP
3G	OFF	OFF	SLEEP	ACTIVE
PROC	OFF	IDLE	2G	3G
BAT	1,0	1,0	1,1	1,2
LDO	ON	ON	ON	ON

Computation of Current for each device in each state:

2G Block:

states: ACTIVE,SLEEP,OFF
active current: clk_i*VDDC*NDP(2G,SLEEP)
static current: area*LBV(VDDC)+I_leak_switch(VDDC) (for off mode only I_leak_switch)
Area:0,3mm² and 400 swicthes

3G Block:

states: ACTIVE,SLEEP,OFF
active current: clk_i*VDDC*NDP(3G,SLEEP)
static current: area*LBV(VDDC)+I_leak_switch(VDDC) (for off mode only I_leak_switch)
Area:0,8mm² and 1000 switches

PROC:
states: 3G,2G,IDLE,OFF
active current: clk_i*VDDC*NDP(3G,SLEEP)+I_access_mem
static current: area*LBV(VDDC)+I_leak_mem+I_leak_switch(VDDC) (for off mode only I_leak_switch)
Area:3,2mm² and 2000 switches

PLL:
states: ON,OFF
active current: I_act(ON) ; (fixed val per state)
static current: fix val(VDDC)

LDO:
states: ON,OFF
I_housekeeping = no_load_current + eff_factor*Iload
I_drawn = Iload + I_housekeeping

CLKMUX:
States:

3G(clk_2G=104, clk_3G=208, clk_PROC=416Mhz)
2G(clk_2G=208, clk_3G=104, clk_PROC=208Mhz)
SLEEP(clk_2G=0, clk_3G=0, clk_PROC=104Mhz)
OFF (all clks=0)

active current: I_act(3G,2G,SLEEP,OFF) ; (fixed value per state)
static current: fix value(VDDC)

Technology/design data

NDP: Normalized Dynamic Power (µA/Mhz/V) Variable

LBV: Leakage Base Value (µA/mm²)

1,0V    3,0E-11
1,1V    4,5E-11
1,2V    7,0E-11

Switch leakage (per switch)1,0V    1,9E-10
1,1V    3,5E-10
1,2V    6,0E-10

Simulation

A number of simulation variations have been constructed to demonstrate the usage. The first is the one below. The others are on separate pages.
Hierarchical View of 2G, 3G, Processor and Battery. No simulation run possible
Parameters + Reports only. To run the simulation, click Go in the below applet.

Top-level Model and the Simulation Plots

The model of example system is embedded below. To run the simulation, click Go in the below applet.