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What is the internal power in power consumption?

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scaramouche

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internal power problem

When i use power compiler or prime power to evaluate my power consumption,
i find some functional block consume most power in internal power.

Would someone like to explain to me what is internal power. It seems related to switching output. And how to reduce it.

THanks in advance
 

Re: internal power problem

Hi ,

I am not a designer but i can give some of the points ....

1) Your Active power is high means your clk gating is not there ? so try to stop clk to the modules when not needed .
2)With in a module you can do some clk gating stratagy based on functional dependancy , when some part of the module is acive other parts are inactive so try to cut clk to those portion of logic .


Thanks & Regards
yln
 

Re: internal power problem

Hi,

You can try the following to make your logic consume less power. these are just a few of the power reduction techniques.

1) convert reg. files to latch files.
2) use clock gating
3) split memory words
4) low-frequency registers
 

Re: internal power problem

Hi sishir,

What do you mean by "split-memory words"? How does this reduce power consumption?

Thnx,
bronzefury
 

Re: internal power problem

Hi,

You can split a big memory into two small equal halves. The advantage is that the power consumed to write data into a smaller size memory should be less when compared a bigger one.
 

Re: internal power problem

Thanks for your replies.
Some strategies u mention really reduce lots of power.

However, when i look into some combinational logic,
even its inputs remains the same, it still consume more
"internal power" than i expect.

Maybe i misunderstand "internal power"
which is one part of dynamic power.
 

Re: internal power problem

scaramouche said:
Thanks for your replies.
Some strategies u mention really reduce lots of power.

However, when i look into some combinational logic,
even its inputs remains the same, it still consume more
"internal power" than i expect.

Maybe i misunderstand "internal power"
which is one part of dynamic power.
Click to expand...

The dynamic power of a circuit is composed of two kinds of power:
1. Switching power
2. Internal power

Internal power is any power dissipated within the boundary of a cell.
During switching, a circuit dissipates internal power by the charging
or discharging of any existing capacitances internal to the cell.
Internal power includes power dissipated by a momentary short
circuit between the P and N transistors of a gate, called short-circuit
power.

For circuits with fast transition times, short-circuit power can be
small. However, for circuits with slow transition times, short-circuit
power can account for 30 percent of the total power dissipated by the
gate.
 
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