search

caophuong2012 / til

What I've learned today
0 stars 0 forks source link

ECC RAM (Error correction code) #23

Open caophuong2012 opened 8 years ago

caophuong2012 commented 8 years ago

ECC RAM is very popular in servers and other systems with high value data as it protects against data corruption by automatically detecting and correcting memory errors.

pic_disp

caophuong2012 commented 8 years ago

ECC use parity check: For example, if the data written to the RAM is "10011011", since even parity is being used, a 1 would be added to the data so that when you add up the numbers (1+0+0+1+1+0+1+1+1), you get an even number. If an error were to occur and the data the RAM sends to the system is instead "10011001+1" (which adds up to an odd number), then the system knows that the data is corrupt.