Nibble utilization for 1x48 interface (or 1x32 with ECC) in the non-flipped configuration is shown in the following figure. DQ indicates data nibbles, AC indicates Address/Command/Control nibbles, sys_clk indicates a nibble comprising the System Clock pair, RESET_n, and ALERT_n signals. Refer to Clocking for System Clock details. Note that the AC nibbles for the ECC device are on nibbles 0 and 1 in the third Bank and DQ nibbles for the ECC device are on nibbles 2 and 3 in the third Bank and nibble 6 and 7 in the second Bank. For a 1x32 interface without ECC all nibbles in the third Bank and nibbles 2, 3, 6, 7, and 8 in the second Bank would be free.
Figure 1. Connections for a 1x32 (or x48) with ECC LPDDR4/4x Interface
Important: The nibble utilization figure is based on the fixed pinout output by Vivado for this configuration.
Figure 2. Nibble utilization for 1x48 component interface (Non-Flipped)