Stock Based Compensation (Tables)



	Three Months Ended				Nine Months Ended
	October 30, 2011		October 31, 2010		October 30, 2011		October 31, 2010
Cost of revenue	$	3,049	$	2,490	$	8,274	$	6,582
Research and development	$	19,308	$	14,104	$	59,594	$	43,251
Sales, general and administrative	$	10,872	$	8,585	$	33,050	$	25,155



	Three Months Ended		Nine Months Ended
	October 30, 2011	October 31, 2010	October 30, 2011	October 31, 2010
Stock Options	(Using a binomial model)
Expected life (in years)	4.1-4.9	4.0-5.5	3.6-5.4	3.1-6.7
Risk free interest rate	1.9-2.4%	1.9-2.7%	1.9-3.8%	1.9-3.0%
Volatility	58-65%	46-47%	46-65%	43-53%
Dividend yield	—	—	—	—



	Three Months Ended				Nine Months Ended
	October 30, 2011		October 31, 2010		October 30, 2011	October 31, 2010
Employee Stock Purchase Plan	(Using a Black-Scholes model)
Expected life (in years)	0.5-2.0		0.5-2.0		0.5-2.0	0.5-2.0
Risk free interest rate	0.1-0.2%		0.2-0.5%		0.1-0.7%	0.2-0.8%
Volatility	61	%	47	%	57-61%	45-47%
Dividend yield	—		—		—	—

Equity Award Activity

The following summarizes the stock option and RSU activity under our equity incentive plans:



	Options Outstanding		Weighted Average Exercise Price
Stock Options	(In thousands)		(Per share)
Balances, January 30, 2011	44,001		$	12.88
Granted	6,271		$	16.22
Exercised	(13,714	)	$	10.69
Cancelled	(1,514	)	$	14.61
Balances, October 30, 2011	35,044		$	14.26



	RSUs Outstanding		Weighted Average Grant-Date Fair Value
Restricted Stock Units	(In thousands)		(Per share)
Balances, January 30, 2011	10,612		$	13.23
Granted	6,802		$	16.43
Vested	(3,441	)	$	12.02
Cancelled	(713	)	$	14.62
Balances, October 30, 2011	13,260		$	15.11

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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