This excerpt taken from the AMD 10-Q filed May 6, 2005.
RESULTS OF OPERATIONS
We use a 52- to 53-week fiscal year ending on the last Sunday in December. The quarters ended March 27, 2005, December 26, 2004 and March 28, 2004 each included 13 weeks.
The following is a summary of our net sales and operating income (loss) by segment and category for the periods presented below: