Various external clock inputs are needed to drive the device. Summary of these input clock signals is as follows:
- High frequency oscillators
- HFOSC0 — the primary system oscillator of the device, and the oscillator is located in the Top Level Domain
- HFOSC1— An auxiliary oscillator that supports audio specific crystal frequencies. The oscillator is located in the Top Level Domain
- Low frequency oscillators
- LSOSC0:— external 32.768KHz crystal interface pins to provide an accurate low frequency clock for use during lower power modes.
- General purpose clock inputs
- MCU_EXT_REFCLK0 — optional external system clock input (Top Level domain).
- EXT_REFCLK1— optional external system clock input (MAIN domain).
- External CPTS reference clock inputs
- CP_GEMAC_CPTS0_RFT_CLK — CPTS reference clock input for CPSW and Timers in MAIN.
- External audio reference clock inputs/outputs
- AUDIO_EXT_REFCLK[2:0] — optional McASP high-frequency input clocks when configured to operate as an input.
Note:
Other clock inputs that are routed directly to the subsystems are described in the respective subsystem chapters.