The following two errors are corrected in the version posted on this site. The text of the paper that appears in the proceedings refers to Table 6.3 in Section 6.3. Table 5 should be referred to in place of Table 6.3. Table 3 in the paper that appears in the proceedings shows an under-estimate for the forward L2Map in the block-grain and ideal block-grain designs. Each forward L2Map entry requires a 20-bit tag, and as a result, each forward L2Map entry would be 38 bits in size as opposed to 18 bits.