AM6548BACDXEAF datasheet(262/282 Pages) TI

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– A to B = E to F = (C to D) / 2

– Matching skew: < 60pS

Note

The OSPI Board Loopback Hold time requirement (described in Section 7.9.5.18, OSPI) is larger than

the Hold time provided by a typical flash device. Therefore, the length of MCU_OSPI[x]_LBCLKO pin

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

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

*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 9-2. OSPI Interface High Level Schematic

9.2.2.3 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 OSPI Interface High Level

Schematic

• Propagation delays and matching:

AM6548, AM6528, AM6526

SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021

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AM6548BACDXEAF Datasheet(PDF) 262 Page - Texas Instruments