Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
In a memory system made up of logical data words each with bit positions accessed by the same logical address bits through separate permuting means which converts said logical address bits to actual address bits for a data bit on the basis of permutation bits that are selected to distribute faulty data bits among the logical data words, the method comprising: comparing the actual address of each fault in each bit position with the logical address of a number of preferred word locations for placing a fault, selecting the permutation bit which places the most faults in preferred word locations.
Claim 2
Dependent Claim
100 words
In a memory system made up of logical data words each with bit positions accessed by the same logical address bits through separate permuting means which converts said logical address bits to actual address bits for a data bit on the basis of permutation bits that are selected to distribute faulty data bits among the logical data words, the method comprising: comparing the actual address of each fault in each bit position with the logical address of a number of preferred word locations for placing a fault, selecting the permutation bit which places the most faults in preferred word locations.
Claim 3
Dependent Claim
48 words
The memory system of claim 1 wherein said comparison is an Exclusive ORing of the actual address of each of the faults with the logical address of each of the preferred word locations, and the selection is a choosing of the most common result of the permutation bit.
Claim 4
Dependent Claim
39 words
The memory system of claim 1 or 2 wherein the selecting of permutation bits starts with bit positions having the most faults conflicting with faults in other bit positions and proceeds in order of decreasing number of such conflicts.
Claim 5
Dependent Claim
21 words
The memory system of claim 3 wherein the preferred word locations include those word locations that have no faulty bits therein.
Claim 6
Dependent Claim
37 words
The memory system of claim 4 wherein the number of errors in a word is equal to the permuted bits whose logical address includes said memory word and unpermuted bits whose real address is said memory word.
Claim 7
Dependent Claim
112 words
In a memory system made up of logical data words each with bit positions accessed by the same logical address bits through separate permuting means which converts said logical address bits to actual address bits for a data bit on the basis of permutation bits that are selected to distribute faulty data bits among the logical data words, the method comprising: comparing the actual address of each fault in each bit position with the logical address of a number of preferred word locations for placing a fault, selecting the permutation bit which places the most faults in preferred word locations, repeating the selecting and comparison steps until all uncorrectable errors are permuted.
Claim 8
Dependent Claim
112 words
In a memory system made up of logical data words each with bit positions accessed by the same logical address bits through separate permuting means which converts said logical address bits to actual address bits for a data bit on the basis of permutation bits that are selected to distribute faulty data bits among the logical data words, the method comprising: comparing the actual address of each fault in each bit position with the logical address of a number of preferred word locations for placing a fault, selecting the permutation bit which places the most faults in preferred word locations, repeating the selecting and comparison steps until all uncorrectable errors are permuted.