Toradex Verdin Development Board User manual

Verdin Development Board
Errata Document

Verdin Development Board Errata
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Document Revision History
Date
Doc. Rev.
Notes
2020-03-24
Rev. 0.90
Initial Release
2020-03-31
Rev. 0.91
Errata #2: Title and content updated
2020-04-14
Rev. 0.92
Minor cosmetic improvements
2020-09-10
Rev. 0.93
Fix versions updated
Errata #4: Added
2021-02-08
Rev. 0.94
Errata #5: Added
2021-04-28
Rev. 0.95
Errata #6: Added
2021-06-15
Rev. 1.0
Errata #7: Added
Errata #8: Added
2021-09-03
Rev. 1.1
Errata #9: Added
Minor changes
2022-01-06
Rev. 1.2
Errata #10: Added
2022-02-14
Rev. 1.3
Errata #11: Added

Verdin Development Board Errata
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Overview
Errata #1: HAR-3274 –Inconsistency concerning the position of general-purpose LEDs and the
order of related signals on connector X38............................................................................4
Errata #2: HAR-3252 –SDIO evaluation kits failing when used in HS400 mode .................................5
Errata #3: HAR-3379 –Missing a pull-up resistor on the WAKE1_MICO# signal ................................6
Errata #4: HAR-3935 –CTRL_FORCE_OFF_MOCI# is pulled-up to wrong voltage rail .....................7
Errata #5: HAR-6600 –Ethernet PHY address strapping resistor for configuring PHYAD2 missing....9
Errata #6: HAR-7206 –Series capacitor values are too small for the audio codec's speaker output to
be used in a stereo setup ...................................................................................................10
Errata #7: HAR-8016 –CSI_1_MCLK Voltage Level is not 3.3V........................................................12
Errata #8: HAR-8290 –The LED status signals of the on-module Ethernet PHY are swapped.........13
Errata #9: HAR-8342 –Stitching Capacitors Influence Verdin iMX8M Plus Bluetooth Config
Strapping.............................................................................................................................14
Errata #10: HAR-8426 –Signal distortion on the audio codec's "Line In" input....................................16
Errata #11: HAR-8833 –The carrier board turns off or resets when a cable is connected to the USB-C
FTDI debug connector........................................................................................................17

Verdin Development Board Errata
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Errata #1: HAR-3274 – Inconsistency concerning the position of general-purpose
LEDs and the order of related signals on connector X38
Affected Version: Verdin Development Board V1.0B
Fixed in: Verdin Development Board V1.1A
1.1 Customer Impact
This error might create confusion while using this product feature.
1.2 Description
The position of LED21, LED22, LED23, LED24 in the general-purpose LEDs and Switches area is not
consistent with the order of related signals available on the connector X38.
This might create confusion when using this product feature.
1.3 Workaround
The table below shows the connections between the X38 connector and the related LEDs. This
table should be used to avoid confusion when using this product feature.
X38 pin
Signal
Linked LED
1
+V1.8_SW
-
2
LED_1
LED21
3
LED_2
LED22
4
LED_3
LED23
5
LED_4
LED24
6
GND
-

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Errata #2: HAR-3252 – SDIO evaluation kits failing when used in HS400 mode
Affected Version: Verdin Development Board V1.0B
Fixed in: Verdin Development Board V1.1A
2.1 Customer Impact
SDIO evaluation kits connected to the SDIO interface of the product may not work correctly at
HS400 mode due to signal integrity issues. Regular SD cards are working fine as expected.
2.2 Description
SDIO interface is failing when SDIO evaluation kits are used in HS400 mode. By default, the
software initiates communication in HS400 mode, which uses a 200MHz clock on the SD_1_CLK
signal; this results in a failed tuning test.
If a mode with lower frequencies is forced, the cards are working fine. This is caused by a signal
integrity issue concerning the clock signal of the SDIO interface.
2.3 Workaround
There is no fix for this issue at the moment. SDIO evaluation kits might need to be used at lower
frequency modes.

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Errata #3: HAR-3379 – Missing a pull-up resistor on the WAKE1_MICO# signal
Affected Version: Verdin Development Board V1.0B
Fixed in: Verdin Development Board V1.1A
3.1 Customer Impact
The absence of a pull-up resistor may lead to an ambiguous signal state.
3.2 Description
The WAKE1_MICO# signal is an open drain signal driven low by a PCI Express Mini Card wake
event. This pin should be pulled up to keep the signal inactive. The absence of the pull-up may
lead to inconsistent signal behavior.
3.3 Workaround
It is recommended to enable the SoM's internal pull-up of the pin connected to this signal.

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Errata #4: HAR-3935 – CTRL_FORCE_OFF_MOCI# is pulled-up to wrong voltage
rail
Affected Version: Verdin Development Board V1.0B
Fixed in: Verdin Development Board V1.1A
4.1 Customer Impact
The main power gets killed when the CTRL_PWR_EN_MOCI# goes low and the +V1.8_SW rail is
turned off. This means the main power is killed during a reset cycle, and the power-down
sequence is not graceful.
4.2 Description
According to the Verdin specifications, the CTRL_FORCE_OFF_MOCI# is an open-drain output of
the module, which is 5V tolerant and requires a pull-up resistor on the carrier board. On the
Verdin Development Board V1.0B, the CTRL_FORCE_OFF_MOCI# is pulled up to the +V1.8_SW
rail. Unfortunately, this rail is switched by the CTRL_PWR_EN_MOCI# signal. During a reset cycle
(software or button initiated), the CTRL_PWR_EN_MOCI# signal can go low for power cycling the
peripherals on the carrier board. This is also disabling the +V1.8_SW, which means the
CTRL_FORCE_OFF_MOCI# goes low and triggers the kill input of IC16. The IC16 then kills the
main power of the module. This means resetting the module can cause an unintentional power-off
of the system.
During a regular power-down cycle, the CTRL_FORCE_OFF_MOCI# signal is supposed to go low
as the last step after all the module and carrier board peripheral rails are shut down in the correct
order. Due to the incorrectly pulled up CTRL_FORCE_OFF_MOCI# signal, the main power gets
killed in a too early state. This means the power rails are not shut down in the intended graceful
sequence. Even with this non-graceful shutdown, damages on the module or carrier board are not
expected.
4.3 Workaround
Removing R80 disables the CTRL_FORCE_OFF_MOCI# signal on the Verdin Development Board.
However, this disables the "kill-feature" entirely. Therefore, the supplies are not turned off after a
shutdown, which prevents the system from being turned on by using the power button. For turning
on the system, either power cycle the whole board or turn off the main 3.3V rail on the carrier
board by pressing the power button for >3s. Besides this inconvenience, the modification is
compatible with all Verdin module versions.
An alternate workaround is removing R95 and adding a 100kΩpull-up resistor from
CTRL_FORCE_OFF_MOCI# to +V5_STB. This makes the circuit fully compatible with the new
Verdin modules. The kill-feature would work with this modification as intended with the new
Verdin modules. However, for the older Verdin iMX8M Mini V1.0B module, the
CTRL_FORCE_OFF_MOCI# is not 5V tolerant, and the CTRL_FORCE_OFF_MOCI# signal gets also
asserted during the reset cycle. After the modification, the development board is no longer
compatible with the Verdin iMX8M Mini V1.0B. Read Errata #13 and Errata #5 of the Verdin
iMX8M Mini V1.0B module for more information. The following picture shows one potential
implementation of the alternate workaround patch:

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Figure 1. Verdin Development Board CTRL_FORCE_OFF_MOCI# pull-up patch (Top Side)
Remove R95
Add 100k resistor

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Errata #5: HAR-6600 – Ethernet PHY address strapping resistor for configuring
PHYAD2 missing
Affected Version: Verdin Development Board V1.0B
Fixed in: Verdin Development Board V1.1A
5.1 Customer Impact
In combination with the Verdin iMX8M Plus, the Ethernet PHY on the carrier board (which is
connected to the RGMII interface of the SoM) gets strapped to address 0b00011 rather than the
intended 0b00111. This address is not compatible with the default address configuration used in
applicable Toradex software, causing the 2nd Ethernet interface of the carrier board to be non-
functional. The strapped value and the resulting PHY address may be different in combination with
future Verdin modules.
5.2 Description
The last three bits of the PHY address are strapped by the PHYAD0, PHYAD1, and PHYAD2 pin.
PHYAD0 and PHYAD1 are located on the LED output signals, which are strapped correctly.
PHYAD2 is located on the RXC pin of the PHY (ETH_2_RGMII_RXC signal). The strapping resistors
R188 and R189 are both missing in the BOM. Intended by design is to strap the signal high by
assembling R188. Since both strapping resistors are missing, the strapping value is dictated by the
module's behavior of the ETH_2_RGMII_RXC signal during the enabling of the Ethernet power rails.
The Ethernet power rails are enabled on the carrier board by the PWR_CTRL_4 signal.
The Verdin iMX8M Plus has a weak pull-down enabled on the ETH_2_RGMII_RXC by default.
Therefore, the PHY address gets strapped to 0b00011 rather than the intended 0b00111. In this
case, the module can only communicate over the MDIO interface with the PHY if the driver
changes the address to 0b00011.
5.3 Workaround
The best workaround is to populate R188 with a 10kΩresistor. The resistor is a 0603 type.
Figure 2. Verdin Development Board –location of R188 (Top Side)

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Errata #6: HAR-7206 – Series capacitor values are too small for the audio codec's
speaker output to be used in a stereo setup
Affected Version: Verdin Development Board V1.1A
Fixed in: To be scheduled
6.1 Customer Impact
The audio output is significantly attenuated or not audible at all when the audio codec's speaker
output is used in combination with external speakers connected in a stereo setup.
The issue does not affect the speaker output when the external speakers are connected in a mono
setup.
6.2 Description
The audio codec featured on the Verdin Development Board V1.1 includes an integrated speaker
driver.
The Verdin Development Board V1.1 provides two audio codec speaker output operating modes:
mono and stereo. In a mono setup, one or two external speakers are connected as a Bridge Tied
Load (BTL) to the connectors X28 or X29. In this setup, the speaker output should work fine.
In a stereo setup, two external speakers are connected to the connector X13. In this case, one end
of each speaker's coil is connected to the common ground pin (GND), the other ends are
connected to the audio codec IC through the capacitors C182 or C183, respectively.
The capacitors C182 (1uF) and C183 (1uF), in conjunction with the speaker's impedance (8Ohm),
form high-pass filters. The cut-off frequency of the high-pass filters is around 20 kHz.
𝑓 = 1
2𝜋𝑅𝐶 =1 2𝜋 ∗ 8𝑂ℎ𝑚 ∗ 1𝑢𝐹 ≈20𝑘𝐻𝑧
This frequency is at the upper edge of the audible frequency range, and lower frequencies are
attenuated/filtered out by the aforementioned high-pass filter.
6.3 Workaround
A partial workaround has already been applied to the Verdin Development Board V1.1A: 0Ohm
resistors have assembled instead of the capacitors C182 and C183. To complete the workaround,
external capacitors connected in series with the external speakers are required (see Figure 3).
The exact values of the capacitors depend on the desired cut-off frequency and the impedance of
the speakers. Some applications may not require the complete audible frequency range of approx.
20Hz –20Hz to be available. The low-frequency limit is 100Hz for many low-power speakers, so
going below this cut-off frequency may be unnecessary.
For 8Ohm speakers, we recommend using either 220uF series capacitors for a cut-off frequency of
approximately 90Hz or 470uF for 42Hz respectively (minimum 6.3V rated in both cases).

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Figure 3. Verdin Development Board –connection of the external speakers in a stereo setup, with
external series capacitors

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Errata #7: HAR-8016 – CSI_1_MCLK Voltage Level is not 3.3V
Affected Version: Verdin Development Board V1.0B
Verdin Development Board V1.1A
Fixed in: TBD
7.1 Customer impact
If a MIPI CSI-2 camera requires the CSI_1_MCLK signal (pin #12 of X47), and if it requires this
signal to be at 3.3V level, then the current voltage level of the signal won't be compatible with the
camera.
7.2 Description
On the MIPI CSI-2 interface used on the Verdin Development Board V1.1A, all single-ended
signals are at 3.3V level, except for the CSI_1_MCLK signal (pin #12 of X47), which is at 1.8V
level.
7.3 Workaround
In case a MIPI CSI-2 camera requires the CSI_1_MCLK signal (pin #12 of X47), and in case it
requires this signal to be at 3.3V level, it could be level shifted on custom carrier boards.

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Errata #8: HAR-8290 – The LED status signals of the on-module Ethernet PHY
are swapped
Affected Version: Verdin Development Board V1.0B
Verdin Development Board V1.1A
Fixed in: TBD
8.1 Customer impact
The roles of the Ethernet link and activity LEDs are swapped (the wrong Ethernet LED is turned on
or is blinking).
8.2 Description
The KSZ9131 Ethernet PHY on the Verdin modules has two LED outputs (ETH_1_LED_1 and
ETH_1_LED_2) used to indicate the link and activity statuses on the bus. These LEDs are available
on pin 235 and 237 of the module edge connector, respectively. ETH_1_LED_1 (pin 235) is
intended to indicate the activity status, while ETH_1_LED_2 (pin 237) is intended to indicate the link
status.
On the PCB versions 1.0 and 1.1, these two signals are swapped. In the next revision of the carrier
board PCB, the connections will be corrected. In the Verdin Development Board datasheet, the
corrected connections are shown.
8.3 Workaround
For custom carrier board designs, the correct LED connections should be implemented.
A potential workaround could be flipping the roles and behavior of the LED outputs of the on-
module Ethernet PHY in software. However, this is not supported by the related driver.

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Errata #9: HAR-8342 – Stitching Capacitors Influence Verdin iMX8M Plus
Bluetooth Config Strapping
Affected Version: Verdin Development Board V1.0B
Verdin Development Board V1.1A
Fixed in: Verdin Development Board V1.1B
9.1 Customer impact
The Bluetooth solution of the Wi-Fi/Bluetooth-equipped Verdin iMX8M Plus SoM is not accessible
by the system as the host interface strapping signal of the Bluetooth solution is unintentionally
influenced by two stitching capacitors on the carrier board. This leaves the Bluetooth solution in the
UART interface mode instead of SDIO.
9.2 Description
The signal used for strapping the HCI (Host Controller Interface) configuration of the Bluetooth
solution at the time of powering up a Verdin iMX8M Plus SoM is also available on the Module-
specific pin MSP_8 (#104) of the SoM edge connector. Module-specific pins feature stitching
capacitors for providing current return paths for cases when those pins are being used for
accommodating high-speed signals.
The Verdin Development Board V1.1A features two such capacitors (C250, C313) on the MSP_8
signal. During powering up the system, the stitching capacitors delay the transition of the related
signal to the intended state and thus result in a wrong configuration being strapped. Instead of
SDIO mode, the host interface of the Bluetooth solution gets configured to UART mode. As a result,
the Bluetooth solution is not accessible by the system.
The strapping of the Wi-Fi/Bluetooth module of the Verdin iMX8M Mini SoM is not affected by the
stitching capacitors on MSP_8. The Verdin iMX8M Mini provides the strapping pin on the MSP_25,
which does not feature strapping capacitors.
9.3 Workaround
Remove the stitching capacitors C250 and C313 from the carrier board. This makes the Bluetooth
interface work in case the carrier board is connected to a Verdin iMX8M Plus SoM with a hardware
version of V1.0C or newer.

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Figure 4. Location of C250 and C313 (top side)
If the carrier board is connected to a Verdin iMX8M Plus V1.0B, another stitching capacitor needs
to be removed from the SoM. For more information, please refer to HAR-8341 in the Verdin
iMX8M Plus errata. The issue will be resolved in future HW versions of these products.

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Errata #10: HAR-8426 – Signal distortion on the audio codec's "Line In" input
Affected Version: Verdin Development Board V1.0B
Fixed in: Verdin Development Board V1.1A
10.1 Customer impact
The audio signals from the "Line In" input (connector X21) are distorted and the amplitudes of the
signals are smaller than intended. There is crosstalk from the "Line In" input (connector X21) to the
"Mic In" input (connector X22).
10.2 Description
The 10k pull-down resistors R135 and R138 connected to the pins 26 and 24 of the audio codec
(IC28) affect the functionality of the device’s internal multiplexers and signal amplifiers. The analog
input pins of the audio codec shift the input DC offset to their internal virtual ground VMID. The
external pull-down resistors are affecting this DC offset, causing the opening of the internal
multiplexer’s analog signal switches and the saturation of the amplifier's outputs. This leads to the
distortion of the "Line In" signals (only the positive polarity parts of the input signals are recorded)
and crosstalk from the "Line In" input to the "Mic In” input.
10.3 Workaround
Remove the pull-down resistors R135 and R138 from the carrier board. This makes the audio
codec’s "Line In" and "Mic In” inputs work properly.
Figure 5. Location of R135 and R138 (top side)

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Errata #11: HAR-8833 – The carrier board turns off or resets when a cable is
connected to the USB-C FTDI debug connector
Affected Version: Verdin Development Board V1.0B
Verdin Development Board V1.1A
Verdin Development Board V1.1B
Fixed in: Verdin Development Board V1.1C
11.1 Customer impact
The module may reset or turn off, or the carrier board may turn off when a cable is being
connected to the USB-C connector of the FTDI debug port while the board is turned on.
11.2 Description
Due to a race condition between the pull-up voltage at the gates of the transistor level shifters, the
DBG_PWR_BTN#, DBG_FORCE_OFF#, DBG_RESET#, DBG_RECOVERY#, and the
FTDI_JTAG_TRST# signals can get unintentionally triggered when connecting a cable to the USB-C
connector of the FTDI debug port. This may reset or shut down the module or shut down the power
rails of the carrier board.
11.3 Workaround
Connect the cable to the USB-C connector of the FTDI debug port before powering on the carrier
board.
As an alternative solution, the resistors R165, R168, R172, R175, and R319 can be replaced with
resistors having a resistance of 1MOhm. This slows down the transistor level shifter circuits and
makes sure that the power control signals are not triggered when connecting the cable to the USB-
C connector of the FTDI debug port. The same improvement is going to be implemented in future
versions of the product.

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Figure 6. Location of R165, R168, R172, and R175 (top side)
Figure 7. Location of R319 (top side)

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DISCLAIMER:
Copyright © Toradex AG. All rights are reserved. The information and content in this document are
provided "as-is" with no warranties of any kind and are for informational purposes only. Data and
information have been carefully checked and are believed to be accurate; however, no liability or
responsibility for any errors, omissions, or inaccuracies is assumed.
Brand and product names are trademarks or registered trademarks of their respective owners.
Specifications are subject to change without notice.