The 16-Bit Host Bus (HB-16) Mode uses fewer address pins than the 8-Bit Host Bus (HB-8) Mode; hence, more pins are available for data. The HB-16 Mode is also slower than the General-Purpose Mode in order to accommodate older logic. The HB-16 Mode is selected with the MODE field of EPI Configuration Register. Within the HB-16 Mode, two additional registers are used to select address/data muxing, byte selects, chip selects, and other options. These registers are the HB-16 Configuration Register and the
HB-16 Configuration2 Register. See Figure 5-20 for a snapshot of HB-16 registers, modes, and features.