AM2434...ALV datasheet(260/280 Pages) TI

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9.2.3.3 DQS (only available in Octal SPI devices)

• The OSPI[x]_CLK output pin must be connected to the CLK input pin of the attached OSPI/QSPI/SPI device

• The DQS pin of the attached OSPI/QSPI/SPI device must be connected to OSPI[x]_DQS pin

• The signal propagation delay from the attached OSPI/QSPI/SPI device DQS pin to the OSPI[x]_DQS pin (D

to C) must be approximately equal to the signal propagation delay from the OSPI[x]_CLK pin to the attached

OSPI/QSPI/SPI device CLK pin (A to B)

• The signal propagation delay of each OSPI[x]_D[y] and OSPI[x]_CSn[z] pin to the corresponding attached

OSPI/QSPI/SPI device data and control pin (E to F, or F to E) must be approximately equal to the signal

propagation delay from the OSPI[x]_CLK pin to the attached OSPI/QSPI/SPI device CLK pin (A to B)

• 50 Ω PCB routing is recommended along with series terminations, as shown in Figure 9-4

• Propagation delays and matching:

– (D to C) = ((A to B) ± 30 ps)

– (E to F, or F to E) = ((A to B) ± 60 ps)

OSPI[x]_CLK

OSPI/QSPI/SPI

Device Clock Input

OSPI/QSPI/SPI

Device IO[y], CS#

OSPI[x]_D[y],

OSPI[x]_CSn[z]

OSPI_Board_03

OSPI[x]_LBCLKO

OSPI[x]_DQS

OSPI Device DQS

* 0 Ω resistor (R1), located as close as possible to the OSPI[x]_CLK pin, is a placeholder for fine tuning, if needed.

Figure 9-4. OSPI Connectivity Schematic for DQS

AM2434, AM2432, AM2431

SPRSP65D – APRIL 2021 – REVISED AUGUST 2022

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AM2434...ALV 数据表(PDF) 260 Page - Texas Instruments