AM6421 datasheet(129/237 Pages) TI

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Figure 7-13. Clock Switching Characteristics

7.10.4 Clock Specifications

7.10.4.1 Input Clocks / Oscillators

Various external clock inputs/outputs are needed to drive the device. Summary of these input clock signals is as

follows:

• MCU_OSC0_XO/MCU_OSC0_XI — Еxternal main crystal interface pins connected to internal oscillator

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

• General purpose clock inputs

– MCU_EXT_REFCLK0 — optional external. Provides 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_REFCLK0P/N — SerDes reference clock input for PCIe or Optional USB3.0 interfaces.

• External CPTS reference clock inputs

– CP_GEMAC_CPTS0_RFT_CLK — CPTS reference clock inputs for CP_GEMAC_CPTS0_RFT_CLK.

– CPTS_RFT_CLK — CPTS reference clock inputs for CPTS_RFT_CLK.

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

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AM6442, AM6441, AM6421

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SPRSP56 – JANUARY 2021

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AM6421 Datasheet(PDF) 129 Page - Texas Instruments