TCAM 0芯片发生parity error。
1.parity error：
Parity checking is the storage of an extra binary digit (bit) in order to represent the parity (odd or even) of a small amount of computer data (typically one byte) while that data is stored in memory. The parity value calculated from the stored data is then compared to the final parity value. If these two values differ, this indicates a data error, and at least one bit must have been changed due to data corruption.
Within a computer system, electrical or magnetic interference from internal or external causes can cause a single bit of memory to spontaneously flip to the opposite state. This event makes the original data bits invalid and is known as a parity error.
Such memory errors, if undetected, may have undetectable and inconsequential results or may cause permanent corruption of stored data or a machine crash.
翻译：
奇偶校验是为了表示少量计算机数据（通常为一个字节）的奇偶校验（奇数或偶数）而存储的额外二进制数位（位）。 然后将根据存储的数据计算出的奇偶校验值与最终奇偶校验值进行比较。 如果这两个值不同，则表明存在数据错误，并且由于数据损坏而必须更改至少一位。
在计算机系统中，内部或外部原因引起的电气或电磁干扰会导致单个内存自发地翻转到相反的状态。 此事件使原始数据位无效，称为奇偶校验错误。
如果未检测到此类内存错误，可能会导致无法检测且无关紧要的结果，或者可能导致存储数据永久损坏或机器崩溃。
2.错误产生的原因及建议
parity error产生的原因可能是软件问题也可能是硬件故障，建议针对该设备和板卡保持观察至少72小时，如在这期间未出现故障，则可认为是软件导致单次错误，如持续有log报出则需要考虑更换硬件。
