This excerpt taken from the AMD 10-K filed Feb 27, 2006.
Redemption of 4.75% Debentures
On January 12, 2006, the Company sent a notice of redemption to the holders of its 4.75% Debentures due 2022, with a redemption date of February 6, 2006. Prior to the redemption date, holders of these debentures elected to convert their debentures into 21,378,605 shares of the Companys common stock pursuant to the original terms of the 4.75% Debentures. Accordingly, as of February 6, 2006, the 4.75% Debentures were no longer outstanding.