SECDED Code for 8 Bits

Produce a 13-bit word: 12 even-parity Hamming bits and one overall parity bit. Data positions are 3, 5, 6, 7, 9, 10, 11, and 12 (one-based numbering).

• Correct any single-bit error, including an error in the overall parity bit.
• Detect double-bit errors and set uncorrectable=1; in that case data_out=0.
• With no error, corrected=0 and uncorrectable=0.