Why is a block of data in my DS28E80 is not responding to new Write data?

Question

Accepted Answer

The DS28E80 has a Block Write Protect feature. The block that is not accepting new data likely has been write protected. 
 
 Example: 
 
 Reading the contents of memory: 
 
 Writing new data:

Reading back the same locations:

Block 01h is not accepting the 03h write. 
 
 Check the Write Protect Status:

Solution: Clear the Write Protect (in this example, for block 01h).