AM652X datasheet(281/299 Pages) TI1

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MCU_OSPI[x]_CLK

OSPI/QSPI/SPI

device clock input

OSPI/QSPI/SPI

device IOy, CS#

MCU_OSPI[x]_D[y],

MCU_OSPI[x]_CSn[z]

OSPI_Board_01

281

AM6548, AM6528, AM6546

AM6526, AM6527

www.ti.com

SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Applications, Implementation, and Layout

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test design implementation to confirm system functionality.

7.1

DDR Board Design and Layout Guidelines

The goal of the DDR3L, DDR4, and LPDDR4 Board Design and Layout Guidelines Application Report

(SPRACI2) is to make the DDR3L, DDR4, and LPDDR4 system implementation straightforward for all

designers. Requirements have been distilled down to a set of layout and routing rules that allow designers

to successfully implement a robust design for the topologies that TI supports. TI only supports board

designs using DDR3L, DDR4, and LPDDR4 memories that follow the guidelines in this document.

7.2

OSPI Board Design and Layout Guidelines

The following section details the routing guidelines that must be observed when routing the OSPI

interfaces.

7.2.1

No Loopback & Internal Pad Loopback

•

The MCU_OSPI[x]_CLK output signal must be connected to the CLK pin of the flash device

•

The signal propagation delay from the MCU_OSPI[x]_CLK signal to the flash device must be < 450pS

(~7cm as stripline or ~8cm as microstrip)

•

50 Ω PCB routing is recommended along with series terminations, as shown in Figure 7-1

•

Propagation delays and matching:

–

A to B < 450ps

–

Matching skew: < 60pS

Figure 7-1. OSPI Interface High Level Schematic

NOTE

*0 Ω resistor (R1), located as close as possible to the MCU_OSPI[x]_CLK pin, is placeholder

for fine tuning, if needed.

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