Tool/software:
Hi TI Experts,
Can you share the external LVCMOS Digital Clock Source specifications and guidelines while using external LVCMOS clock input as the processor clock source for
MCU_OSC0 (WKUP_OSC0 for AM62L)
WKUP_LFOSC0 (LFOSC0 for AM62L)
Hi Board designers,
The FAQ is generic and can also be used for
AM625 / AM623 / AM625SIP / AM625-Q1 / AM620-Q1 processor family
AM62A7 / AM62A7-Q1 / AM62A3 / AM62A3-Q1 / AM62A1 / AM62A1-Q1 and AM62D-Q1 processor families.
AM62P, AM62P-Q1 processor family
AM62L processor family
Refer below inputs:
External LVCMOS clock specifications:
Data Sheet reference
MCU_OSC0 LVCMOS Digital Clock Source Requirements
Note: The table is added for quick reference. refer to the data sheet for the updated information.
Datasheet
AM62Dx Sitara Processors datasheet
https://www.ti.com/lit/pdf/sprspb5
Refer processor-specific data sheet for the required information.
The Specification in the data sheet is currently being updated.
Follow the above specification in case the specifications are not available in the data sheet.
Connection of LVCMOS clock input
1.8V LVCMOS-Compatible Clock Input
The clock inputs are not fail-safe
The clock inputs are referenced to 1.8V, VDDS_OSC0.
The Clock input is not fail-safe
It is recommended to connect the Oscillator supply to the same supply that is connected to the VDDS_OSC0
Is there any concerns using LVCMOS clock input
Using a crystal to create a reference clock for AM62x family of processors is preferred because there is less risk of clock jitter issues.
There is no concern using LVCMOS clock input. Follow the above specifications while selecting the oscillator. If you use a LVCMOS oscillator, select one that doesn't contain a PLL. LVCMOS clock sources that only implement a crystal oscillator operating in fundamental oscillation mode provides lower clock jitter than one with a PLL.
Ensure you follow the Note added in the MCU_OSC0 LVCMOS Digital Clock Source section of the data sheet
Regards,
Sreenivasa
