SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
The level 3 cache/snoop filter tags stored in on-chip SRAM are also SEC/DED protected similarly to the data storage. Due to timing closure including all of the tag bits for a given set into one hamming data + code word is not possible. Instead, the 32 ways are broken into 8 groups of 4 ways each comprising hamming data (100 bits) + code (9 bits). The MSMC core logic outputs 8 logical SRAM interfaces for the tag memories based on the EDC protection quanta sizes. The hamming protection bits are stored at the most significant bit positions of the total data + hamming word inside the logical memory instance.