Magic Blue Smoke


Retention Mechanisms used in a Power Gated Design (Cont’d)

Last week, we discussed about the type of retention registers available. In this post let me highlight few more points

Pro’s and Con’s of Single Pin Vs Dual Pin retention flops:

Advantages of Single Pin:

Minimal area impact
Single signal controls retention

Disadvantages of Single Pin:

Performance Impact on the register
Hold Time requirements for the input data

Advantage of Dual Pin:
Minimal leakage power
Minimal performance impact compared to the Single Pin design
Minimal dependency on the clock for the control signals.

Disadvantages of Dual Pin:
Area Impact
More Complex System Design
More Buffer Network and AON network required.

In my next post, I will try to highlight some of the key requirements w.r.t retention mechanism when memories are used.

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