22.4.2.1.3 Parity Support

Parity is a simple method of single-bit error detection. The data bits are summed and compared to the parity value indicating a bit error. Parity selection can either be even or odd and is represented by the ninth data bit. To calculate parity, the number of data bits that are a ‘1’ are counted.

• Even parity is defined as an odd number of data bits whose values are ‘1’.
• Odd parity is defined as an even number of data bits whose values are ‘1’.

The parity bit itself is then added to the count, hence the even or odd designation. Parity calculation and checking are enabled by selecting one of the two 8-Bit Asynchronous Parity modes (MODE[3:0] = 0b001x).