4.2 Issue 2 - MDIO Ethernet PHY Communications
Applicable EVM Revisions: E2
Issue Description: On some EVM, U78 MDIO MUX path has been shown to result in intermittent MDIO PHY
communication between the AM64x SoC and CPSW and ICSSG Ethernet PHY.
Workaround: Modifications number 4 and 5 are applied to the assembly. These modifications result in the HSE
header losing access to the HSE_PRG0_PRU1_GPO18 and HSE_PRG0_PRU1_GPO19 signals.
Modification 4 description:
• R370, 2.2kΩ resistor installed
Modification 5 description:
• All components located on the bottom of the PCB assembly layer
• Remove U78
• Short U78.2 to U78.4
• Short U78.8 to U78.6
4.3 Issue 3 - DC Barrel Jack Warning when Hot-Plugging
Applicable EVM Revisions: E2, A
Issue Description: Many cost-saving plug designs do not guarantee a secure, ground-first connection when
attempting to hot-plug the J6 DC Barrel Jack connector. This could lead to intermittent brown-out type conditions
that may result in damage to the board.
Solution: Hot plugging the power supply is never recommended at the connector end. The “Power On/Off
Procedures” outlined in the “Getting Started” section of the document should be followed when applying or
removing power from the board. Furthermore, a “Tuning Fork” style DC barrel plug of part number CUI In.
PP3-002AH is recommended to ensure a proper electrical and mechanical connection between the EVM and its
respective DC 12V Power Supply.
5 References
• AM64x Sitara™ Processors Data Manual
• AM64x Processors Silicon Revision 1.0 Texas Instruments Families of Products Technical Reference Manual
6 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (March 2021) to Revision C (June 2021) Page
• Updated the numbering format for tables, figures and cross-references throughout the document...................3
• Added the AM243x device information throughout the document...................................................................... 3
• Updates made in Section 3.1..............................................................................................................................6
• Updates were made in Section 3.4.4.1.............................................................................................................18
• Update was made in Section 3.4.12................................................................................................................. 44
• Update was made in Section 3.4.13................................................................................................................. 46
• Added new Section 4.3.....................................................................................................................................61
www.ti.com
Known Issues and Modifications
SPRUIX0C – FEBRUARY 2021 – REVISED JUNE 2021
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AM64x/AM243x GP EVM User's Guide 61
Copyright © 2021 Texas Instruments Incorporated
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