The LDPC codes for flash memories can be found in the .zip file that you can download below. The zip file includes three .txt LDPC parity check matrices. Each line represents an edge between a check node and variable node. The third number in each line is just an indicator with 0 indicating the end of the file.

The degree distribution of the codes is as follows:

Code 1:
λ(x) = 2.0054E^-5x⁰ + 0.035776x¹ + 0.39869x² + 0.0084827x⁸ + 0.037701x⁹ + 0.51933x¹⁸.
ρ(x) = 0.15662x⁵⁴ + 0.84338x⁵⁵.

Code 2:
λ(x) = 1.7701E^-5x⁰ + 0.031579x¹ + 0.46923x³ + 0.0074877x⁸ + 0.033278x⁹ + 0.45841x¹⁸.
ρ(x) = 0.0010975x⁶¹ + 0.73267x⁶² + 0.26623x⁶³.

Code 3:
λ(x) = 0.032172x¹ + 0.002681x² + 0.55764x³ + 0.40751x²³.
ρ(x) = 0.10366x⁵⁷ + 0.89634x⁵⁸.

[Download Codes]