AM652X datasheet(282/299 Pages) TI1

282 / 299 page

282

AM6548, AM6528, AM6546

AM6526, AM6527

SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018

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Applications, Implementation, and Layout

7.2.2

External Board Loopback

•

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

•

The MCU_OSPI[x]_LBCLKO output signal must be looped back into the MCU_OSPI[x]_DQS input

•

The signal propagation delay from the MCU_OSPI[x]_CLK pin to the flash device CLK input pin (A to

should

approximately

equal

half

the

signal

propagation

delay

from

the

MCU_OPSI[x]_LBCLKO pin to the MCU_OSPI[x]_DQS pin ((C to D)/2). See CAUTION note below.

•

The signal propagation delay from the MCU_OSPI[x]_CLK pin to the flash device CLK input pin (A to

B) must be approximately equal to the signal propagation delay of the control and data signals

between the flash device and the SoC device (E to F, or F to E)

•

50 Ω PCB routing is recommended along with series terminations, as shown in Figure 7-2

•

Propagation delays and matching:

–

A to B = E to F = (C to D) / 2

–

Matching skew: < 60pS

CAUTION

The

OSPI

Board

Loopback

Hold

time

requirement

(described

Section 5.11.5.18, OSPI) is larger than the Hold time provided by a typical flash

device.

Therefore,

the

length

MCU_OPSI[x]_LBCLKO

the

MCU_OSPI[x]_DQS pin (C to D) may need to be shortened to compensate.

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