Iterative decoder memory arrangement

A system comprising:

• a channel detector;
• a code decoder that is communicatively coupled with the channel detector, the code decoder to decode codewords comprising a current codeword and a previous codeword, wherein the code decoder and the channel detector form an iterative decoder;
• R banks;
• Q banks;
• circuitry configured to store R data for a current codeword in a first R bank of the R banks and store R data for a previous codeword in a second R bank of the R banks;
• circuitry configured to alternate among the R banks for storing current codeword R data;
• circuitry configured to store Q data for the current codeword in a first Q bank of the Q banks and store Q data for the previous codeword in a second Q bank of the Q banks;
• and
• circuitry configured to alternate among the Q banks for storing current codeword Q data.

A method comprising:

• storing first R data for a current codeword in a first R bank of two or more R banks;
• storing second R data for a previous codeword in a second R bank of the two or more R banks;
• alternating among the two or more R banks for storing current codeword R data;
• storing first Q data for the current codeword in a first Q bank of two or more Q banks;
• storing second Q data for the previous codeword in a second Q bank of the two or more Q banks;
• and
• alternating among the two or more Q banks for storing current codeword Q data.