An apparatus comprising: means configured to store data for a first level access at a multi-level access memory system; and means configured to store data for a second level access at the multi-level memory system, characterized by: means configured to selectively enable a first portion of the means configured to store data for the second level access, to operate as an extension of the means configured to store data for the first level access; means configured to determine, after receiving a memory access request, whether the first portion of the means configured to store data for the second level access is enabled to operate as an extension of the means configured to store data for the first level access, based a status bit, said status bit depending on a result of said memory access request and corresponding to said first portion of means configured to store data for the second level access; and means configured to route the memory access request to the first portion of the means configured to store data for the second level access in parallel with the means configured to store data for the first level access, conditioned upon a determination that the first portion of the means configured to store data for the second level access is enabled to operate as an extension of the means configured to store data for the first level access. means configured to store data for a first level access at a multi-level access memory system; and means configured to store data for a second level access at the multi-level memory system, characterized by: means configured to selectively enable a first portion of the means configured to store data for the second level access, to operate as an extension of the means configured to store data for the first level access; means configured to determine, after receiving a memory access request, whether the first portion of the means configured to store data for the second level access is enabled to operate as an extension of the means configured to store data for the first level access, based a status bit, said status bit depending on a result of said memory access request and corresponding to said first portion of means configured to store data for the second level access; and means configured to route the memory access request to the first portion of the means configured to store data for the second level access in parallel with the means configured to store data for the first level access, conditioned upon a determination that the first portion of the means configured to store data for the second level access is enabled to operate as an extension of the means configured to store data for the first level access. means configured to selectively enable a first portion of the means configured to store data for the second level access, to operate as an extension of the means configured to store data for the first level access; means configured to determine, after receiving a memory access request, whether the first portion of the means configured to store data for the second level access is enabled to operate as an extension of the means configured to store data for the first level access, based a status bit, said status bit depending on a result of said memory access request and corresponding to said first portion of means configured to store data for the second level access; and means configured to route the memory access request to the first portion of the means configured to store data for the second level access in parallel with the means configured to store data for the first level access, conditioned upon a determination that the first portion of the means configured to store data for the second level access is enabled to operate as an extension of the means configured to store data for the first level access.