AM652X datasheet(255/277 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_02

MCU_OSPI[x]_LBCLKO

MCU_OSPI[x]_DQS

255

AM6548, AM6528, AM6546

AM6526, AM6527

www.ti.com

SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Applications, Implementation, and Layout

•

Propagation delays and matching:

–

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

–

Matching skew: < 60pS

NOTE

The OSPI Board Loopback Hold time requirement (described in Section 5.9.5.18, OSPI) is

larger than the Hold time provided by a typical flash device. Therefore, the length of

MCU_OPSI[x]_LBCLKO pin to the MCU_OSPI[x]_DQS pin (C to D) may need to be

shortened to compensate.

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

placeholder for fine tuning, if needed

Figure 7-2. OSPI Interface High Level Schematic

7.2.2.3

DQS (only available in Octal Flash devices)

•

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

•

The DQS pin of the flash devices must be connected to MCU_OSPI[x]_DQS signal

•

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

B) should be approximately equal to the signal propagation delay from the MCU_OSPI[x]_DQS pin to

the DQS output pin (C to D)

•

50 Ω PCB routing is recommended along with series terminations, as shown in Figure 7-3

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