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Figure 7-13. Clock Switching Characteristics

7.9.4 Clock Specifications

7.9.4.1 Input Clocks / Oscillators

Various external clock inputs are needed to drive the device. Summary of these input clock signals are:

• OSC1_XO/OSC1_XI — Еxternal main crystal interface pins connected to internal oscillator which sources

reference clock and provides reference clock to PLLs within MAIN domain. Also, for audio applications,

high-frequency oscillator 0 is used to provide audio clock frequencies to MCASPs.

• WKUP_OSC0_XO/WKUP_OSC0_XI — Еxternal main crystal interface pins connected to internal oscillator

which sources reference clock and provides reference clock to PLLs within MCU domain and MAIN domain.

• WKUP_LFOSC_XO/WKUP_LFOSC_XI — External main crystal interface pins connected to internal oscillator

which sources reference clock provides a clock for low power operation in deeper sleep modes.

• MCU_EXT_REFCLK0 — Optional external system clock input (MCU domain).

• EXT_REFCLK1— Optional external System clock input (MAIN domain). Optionally PLL2 (PER1) and MCASP

can be sourced by EXT_REFCLK1 (sourced externally).

• SERDES0_REFCLK P/N and SERDES1_REFCLK P/N — SerDes reference clock for PCIe or Optional

USB3.0 PHY.

• MCU_CPTS0_RFT_CLK — CPTS reference clock inputs for MCU_CPTS0_RFT_CLK.

• CPTS_RFT0_CLK — CPTS reference clock inputs for CPTS0_RFT_CLK.

• VOUT1_EXTPCLKIN — Optional for the DPI1 Port of DSS.

• REFCLK0 P/N and REFCLK1 P/N — There are 2 differential clock output pins to support 2 PCIe devices.

Figure 7-14 shows the external input clock sources to peripherals.

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AM6548, AM6528, AM6526

SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021

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AM6548 Datenblatt(PDF) 151 Page - Texas Instruments