Error Checking and Correcting Two major types of data errors can occur in data transmission: -hard errors,which are permanent,arise from broken interconnects,internal shorts,or open leads - soft errors,which are transient,are caused by system noise,power surges,and alpha particles. The processor (MIPS R4000)verifies data correctness by using either the parity or the SECDED code as it passes data from the System interface to the secondary cache,or it moves data from the secondary cache to the primary caches or to the System interface.Error Checking and Correcting • Two major types of data errors can occur in data transmission: – hard errors, which are permanent, arise from broken interconnects, internal shorts, or open leads – soft errors, which are transient, are caused by system noise, power surges, and alpha particles. • The processor（MIPS R4000）verifies data correctness by using either the parity or the SECDED code as it passes data from the System interface to the secondary cache, or it moves data from the secondary cache to the primary caches or to the System interface