The integrated DDRMC can also be configured as two independent DDR interfaces of 16 or 32 data bits each. This section describes the Flipped 2x32 LPDDR4/4X interface.
Figure 1. Connections for a 2x32 LPDDR4/4x Interface
Nibble utilization for 2x32 interface using two x32 components in the flipped configuration is shown in the following figure. This pinout provides the maximum interface performance compared to the 2x32 pin efficient version. DQ indicates data nibbles, AC indicates Address/Command/Control nibbles, sys_clk indicates a nibble comprising the Reference Clock pair, RESET_n, and ALERT_n signals. For a 1x32 interface all nibbles in the first Bank and nibbles 0, 1, 4, 5, and 8 in the second Bank would be free.
Important: The
nibble utilization figure is based on the fixed pinout output by Vivado for this configuration.
Figure 2. Nibble Utilization for 2x32 Component Interface (Flipped)
