SPRUJ55D September 2023 – July 2025 AM263P2 , AM263P2-Q1 , AM263P4 , AM263P4-Q1
The DualMode is an extension of the RL2 that supports two times that max remote cache data storage memory while keeping the tag RAM the same size. That is each way instead of representing a single cache line, represents two consecutive cache lines. This allows the remote cache data storage memory to be twice as large using the same tag RAM. When the L2_CTRL.size is set to 5 the dual mode is selected. In this mode there are the same number of cache line entries (4096),but the remote cache data storage memory is doubled. Each WAY now supports 64 bytes of cache data in two halves, a high and low sub cache line. This allows twice as much memory while keeping the same number of cache entries. When in this mode, the tag field is reduced by two bits to make room for the extra valid bits for the two sub lines held. This reduction reduces the cacheable range the RL2 can cache.