iMX RT1062 OEM Developer’s Kit - User’s Guide
Page 37
Copyright 2019 © Embedded Artists AB
4.18
Things to Note
This section lists things to note when using the
iMX RT1062 Developer's Kit
.
4.18.1
Three signals in the SDIO interface not available at TPx access pads
Due to signal integrity of the high-speed signals, three signals are not available per default at
the TPx access pads described in section 4.5 . The stubs to the access pads are removed
from the tracks by not having R150, R151 and R152 not mounted. The affected signals are:
GPIO_SD_B0_01 - mount R150 to access the signal via TP69
GPIO_SD_B0_03 - mount R151 to access the signal via TP73
GPIO_SD_B0_05 - mount R152 to access the signal via TP75
R150-R152 can be found on the bottom side, just under the middle of the SODIMM
connector and under the LCD. R150-R152 are 0 ohm 0402 resistors.
4.18.2
SDIO interface connected to both SD memory card and M.2 connector
Note that the SD memory card connector, J15, and the M.2 connector; J38, both are
connected to the SDIO bus.
Only one interface at a time can be used.
It is possible to disconnect the SD memory card connector, J15, from the SDIO bus by
removing isolation resistors R86-R91. This is typically not needed except when running the
M.2 interface at very high SDIO bus frequencies. R86-R91 are found on the bottom side
under the LCD. Due to their location they are not easy to remove.
4.18.3
Do not use DQS pin (SEMC_DQS)
On iMX RT OEM board versions without SDRAM, the signals SEMC_DQS is available on SODIMM
pad 131 (TP122). Do not use this pin and leave unconnected.
Using this pin, for example as a GPIO, will limit the maximum OctalSPI clock frequency to half of
currently set frequency (66MHz vs 131MHz).
GPIO_AD_B1_04
GPIO_AD_B1_04
Connects to M.2 interface as UART3_CTS. Can be
disconnected via J33, 9-10 position.
GPIO_AD_B1_05
GPIO_AD_B1_05
Connects to M.2 interface as UART3_RTS. Can be
disconnected via J33, 11-12 position.
GPIO_AD_B1_06
GPIO_AD_B1_06
Connects to M.2 interface as UART3_TX. Can be
disconnected via J33, 13-14 position.
GPIO_AD_B1_07
GPIO_AD_B1_07
Connects to M.2 interface as UART3_RX. Can be
disconnected via J33, 15-16 position.
CCM_CLK1_P/_N
CCM_CLK1_P/_N
No special usage on
iMX OEM Carrier Board
.
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