AM652X datasheet(284/299 Pages) TI1

284 / 299 page

MCU_OSPI[x]_CLK

OSPI/QSPI/SPI

device clock input

OSPI_Board_03

MCU_OSPI[x]_DQS

OSPI device DQS

284

AM6548, AM6528, AM6546

AM6526, AM6527

SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Applications, Implementation, and Layout

Figure 7-3. 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.

7.3

High Speed Differential Signal Routing Guidance

The

High-Speed

Interface

Layout

Guidelines

Application

Report

(SPRAAR7)

available

from

http://www.ti.com/lit/pdf/spraar7 provides guidance for successful routing of the high speed differential

signals. This includes PCB stackup and materials guidance as well as routing skew, length and spacing

limits. TI supports only designs that follow the board design guidelines contained in the application report.

7.4

USB Design Guidelines

The USB 3.1 specification allows the VBUS voltage to be as high as 5.5 V for normal operation, and as

high as 20 V when the Power Delivery addendum is supported. Some automotive applications require a

max voltage to be 30 V.

The AM65xx device requires the VBUS signal voltage be scaled down using an external resistor divider

(as shown in the Figure 7-4), which limits the voltage applied to the actual device pin (USB0_VBUS,

USB1_VBUS). The tolerance of these external resistors should be equal to or less than 1%, and the

leakage current of zener diode at 5 V should be less than 100 nA.

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