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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_XI/MCU_OSC0_XO — Еxternal main crystal interface pins connected to the internal high-

frequency oscillator (MCU_HFOSC0), which is the default clock source for internal reference clock

MCU_HFOSC0_CLKOUT.

• General purpose clock inputs

– MCU_EXT_REFCLK0 — Optional external system clock input for MCU domain.

– EXT_REFCLK1 — Optional external system clock input for MAIN domain.

– SERDES0_REFCLK0P/N — Optional SERDES0 reference clock input for PCIe.

• External CPTS reference clock inputs

– CP_GEMAC_CPTS0_RFT_CLK — CPTS reference clock input.

– CPTS_RFT_CLK — CPTS reference clock input.

Figure 7-16 shows the external input clock sources and the output clocks to peripherals.

DEVICE

MCU_SYSCLKOUT0

Main Domain System Clock (MAIN_SYSCLK0) divided-by-4

External main crystal interface pins connected to internal oscillator

which provides reference clock to PLLs within MCU domain

and MAIN domain.

MCU Domain System Clock (MCU_SYSCLK0) divided-by-4

MCU_OSC0_XI

MCU_OSC0_XO

SYSCLKOUT0

J7ES_CLOCK_01

TCK

MCU_EXT_REFCLK0 / EXT_REFCLK1

Optional External System Clock Inputs - (MCU Domain) / (MAIN Domain)

JTAG Clock Input

CLKOUT

CPTS Reference Clock Inputs

CP_GEMAC_CPTS0_RFT_CLK / CPTS0_RFT_CLK

CP_GEMAC_CPTS0_RFT_CLK /

CPTS0_RFT_CLK

MCU_PORz

MCU_RESETz

MCU Warm Reset Input / Device Warm Reset Input

BOOTMODE[15:00]

MCU Power ON Reset / Device Power ON Reset

Boot Mode Configuration / Devices Select

DDR0_CK0/DDR0_CK0_n

DDR Differential Clock Outputs

SERDES0_REFCLK0P/N

Optional SERDES0 Reference Clock Input for PCIe

MCU_OBSCLK0 / OBSCLK0

Observation Clock Outputs for MCU Domain Clock / MAIN Domain Clocks

Reference Clock Output

Figure 7-16. Input Clocks Interface

For more information about Input clock interfaces, see Clocking section in Device Configuration chapter in the

device TRM.

7.10.4.1.1 MCU_OSC0 Internal Oscillator Clock Source

Figure 7-17 shows the recommended crystal circuit. All discrete components used to implement the oscillator

circuit should be placed as close as possible to the MCU_OSC0_XI and MCU_OSC0_XO pins.

AM6442, AM6441, AM6421, AM6412, AM6411

SPRSP56D – JANUARY 2021 – REVISED JULY 2022

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