External Memory Interface Handbook Volume 2: Design Guidelines

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ID 683385
Date 5/08/2017
Public
Document Table of Contents

7.3.3.2.3. Memory Initialization Options for LPDDR2

Memory Initialization Options—LPDDR2

Mode Register 1

Burst Length

Specifies the burst length.

Read Burst Type

Specifies accesses within a given burst in sequential or interleaved order.

Specify sequential ordering for use with the Intel memory controller. Specify interleaved ordering only for use with an interleaved-capable custom controller, when the Generate PHY only parameter is enabled on the PHY Settings tab.

Mode Register 2

Memory CAS latency setting

Determines the number of clock cycles between the READ command and the availability of the first bit of output data at the memory device.

Set this parameter according to the target memory interface frequency. Refer to memory data sheet and also target memory speed grade.

Mode Register 3

Output drive strength settings

Determines the output driver impedance setting at the memory device.

To obtain the optimum signal integrity performance, select the optimum setting based on the board simulation results.

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