There are several possible combinations of device counts and single-side or dual-side mounting. Table 5-61 lists all the supported configurations.
|NUMBER OF LPDDR2 DEVICES||LPDDR2 DEVICE WIDTH (BITS)||MIRRORED?(1)||LPDDR2 EMIF WIDTH (BITS)|
Details on treating unused pins are listed in Section 18.104.22.168.2.3.1.