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SPRUI64E – May 2017 – Revised September 2019
Copyright © 2017–2019, Texas Instruments Incorporated
Known Deficiencies in AM572x IDK EVM
Appendix A
SPRUI64E – May 2017 – Revised September 2019
Known Deficiencies in AM572x IDK EVM
A.1
Power solution not sufficient for full PCIe plug-in card compliance
The AM572x IDK EVM supports compatibility to PCIe x1 plug-in cards. It is not compliant with the PCIe
Card Electro-Mechanical (CEM) specification. Specifically, the board does not provide the recommended
power per the CEM. It provides up to 0.5A of current on the 3.3V/3.3V_AUX input pins and up to 0.5A on
the 12V input pins. Also, the root complex design implemented does not support hot plug-in of cards.
A.2
Early versions of the AM572x IDK EVM not installed with SOC devices rated for the
full industrial temperature range
A.3
AM572x IDK EVM does not support eMMC HS200 mode
The interface voltage for the eMMC is fixed at 3.3V in all modes of operation. This prevents support of
HS200 which requires a transition to 1.8V. The AM572x IDK EVM does support this voltage shift for the
SDCARD attached to the MMC1 port. The MMC1 port is on VDDSHV8 supply that is attached to the
LDO1 PMIC output that supports this voltage shift for higher speed modes. The eMMC is attached to the
VDDSHV11 supply fixed at 3.3V. Board designs that require HS200 support for eMMC would need a
solution to transition from 3.3V to 1.8V under software control.
A.4
PCIe PERSTn line not in proper state at start-up
The board does not contain pull-up or pull-down resistors to allow this line to be pulled-high at start-up.
This can cause PCIe link training to fail. Future software releases need to properly control the GPIO
output pins to enable this correctly at start-up.
A.5
EDIO connectors J4 and J7 should support real-time debugging for both PRU1 and
PRU2
The pins chosen provide visibility to the PRU2 MII0 and MII1 ports and PRU1 EDIO ports.
A.6
HDQ implementation not correct
HDQ was intended to be attached to the Expansion Connector. Since this pin is multiplexed with
XREF_CLK3/CLKOUT3 used with the Camera connector, the clock options implemented for the camera
connector prevent use of HDQ without addition of a wire. This can be enabled by adding a wire between
the open pads of R905 and R300.
A.7
Removing the power plug and inserting it again while the power supply is energized
may cause damage
Removing the power plug and inserting it again while the power supply is energized may damage the
AM572x IDK EVM and/or other devices attached to the board such as emulators that provide an alternate
path to ground. Removal of AC power from the external power supply is a safer method, if required. It is
also recommended that the external power supply have the common return bonded to earth ground. If this
is not possible, a separate connection from the board ground to earth ground may need to be provided.
Test fixtures that repeatedly cycle main power on and off should have the board ground bonded to earth
ground at all times during this testing.
