Dual Channel LPDDR4/4X Interfaces - Dual Channel LPDDR4/4X Interfaces - 1.1 English - PG313

Available options in dual channel topology:

• Dual Channel 16-bit
• Dual Channel 32-bit
• Dual Channel 32-bit as 16-bit Data with 16-bit ECC

PCB Expansion Options:

• Optimum

All Dual Channel LPDDR4/4X interfaces always give the Optimum option but it is possible to get a unique pinout with a Dual Channel 32-bit Pin Efficient option. Fundamentally there are two different Dual Channel LPDDR4/4X pinouts. One is the Dual Channel 32-bit Pin Efficient which only supports single rank devices and the other is all Dual Channel pinouts.

The Pin Efficient pinout is unique as it only supports single rank 2 x 32-bit interfaces. The standard Dual Channel pinouts support single channel and dual channel, single rank or dual rank, topologies. The fundamental pinouts for the standard Dual Channel configuration supports 16-bit, 32-bit, and 32-bit as 16-bit Data and 16-bit ECC configurations. This is because all configurations follow the same basic pinout while more Nibbles are used as the data width increases.

As the data width expands from 16-bit to 32-bit or 32-bit to 48-bit additional Address/Command signals are generated for the additional LPDDR4/4X data channel. The Optimum pinout supports single or dual rank topologies. It is also possible for Single Channel interfaces to expand to Dual Channel interfaces. This is because the non-pin efficient Dual Channel 32-bit pinout is compatible with the individual LPDDR4/4X data channels along with their respective Command/Address bus. All Single Channel LPDDR4/4X interfaces cannot select the LP4 Pin Efficient option in the GUI to ensure forward compatibility with other topologies.

Figure 1. Standard Dual Channel 2 x 16-bit LPDDR4/4X Interface Pinout

Figure 2. Standard Dual Channel 2 x 32-bit LPDDR4/4X Interface Pinout

Figure 3. Pin Efficient Dual Channel 2 x 32-bit Single Rank LPDDR4/4X Interface Pinout

You must use the following connection guidance figures to determine the feasibility of PCB expansion options.

Figure 4. Connections for a 2x16 LPDDR4/4X Interface

Figure 5. Connections for a 2x32 LPDDR4/4X Interface

Figure 6. Connections for a Pin Efficient 2 x 32 Single Rank LPDDR4/4X Interface