Memory organization for multi-mode support

A layout of a circuit board, comprising:

• a first memory package and a second memory package, each comprising:
• first, second, third, and fourth channels arranged consecutively in a clockwise direction, each of the first, second, third, and fourth channels having memory arrays,
• wherein the first and fourth channels comprise initiator channels and exhibit vertical symmetry around a horizontal middle line;
• the second and third channels comprise target channels and exhibit vertical symmetry around the horizontal middle line;
• the first and second channels exhibit horizontal symmetry around a vertical center line;
• and
• the third and fourth channels further exhibit horizontal symmetry around the vertical center line,
• wherein in a first mode, the initiator channels and the target channels are independently accessible, and in a second mode, the first channel controls accesses to the memory arrays in the second channel and the fourth channel controls access to the memory arrays in the third channel.