Extensible memory hub

An apparatus comprising:

• a first extensible non-volatile memory (NVM) hub (EN hub) including a first upstream interface port and a plurality of NVM device ports, wherein the first upstream interface port is electrically coupled to a first channel of a bus;
• and
• a first NVM device electrically coupled to one of the NVM device ports and a second NVM device electrically coupled to another of the NVM device ports, wherein a volume address is assigned to each of the first and second NVM devices;
• a second EN hub electrically coupled to the first EN hub, wherein the second EN hub is electrically coupled to a third NVM device and wherein an additional volume address is assigned to the third NVM device;
• and
• a NVM controller, wherein the first EN hub receives a first identifier from the NVM controller and the first EN hub generates a second identifier based, at least in part, on the first identifier.

An apparatus comprising:

• a bus having at least a first channel and a second channel;
• a first extensible non-volatile memory (NVM) hub (EN hub) assembly electrically coupled to the bus, the first EN hub assembly including at least:
• a first EN hub electrically coupled to the first channel, the first EN hub creating a first electric load on the first channel;
• a second EN hub electrically coupled to the first EN hub without substantially increasing the first electrical load;
• and
• a first NVM device electrically coupled to the first EN hub and a second NVM device electrically coupled to the second EN hub;
• and
• a second EN hub assembly electrically coupled to the bus, the second EN hub assembly including at least:
• a third EN hub electrically coupled to the second channel;
• and
• a third and fourth NVM device electrically coupled to the third EN hub, wherein a volume address is assigned to each of the first, second, third, and fourth NVM devices;
• wherein the first channel electrically drives only the first EN hub of the first EN hub assembly and the second channel electrically drives only the third EN hub of the second EN hub assembly.