UART3_CTS on MCIMX8M-EVK

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UART3_CTS on MCIMX8M-EVK

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ilko
Contributor I

On MCIMX8M-EVK the CPU signal UART3_CTS is connected to WiFI/BT signal BT_UART_CTS.
The BT_UART_CTS signal is an INPUT, the CPU signal UART3_CTS is also an INPUT.
Is this a mistake?
Should not be:

CPU CTS -> BT RTS
CPU RTS -> BT CTS

The RX/TX signals are correct connected:
CPU RX -> BT TX
CPU TX -> BT RX

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weidong_sun
NXP TechSupport
NXP TechSupport

Hi, llko

>>Is this a mistake?

No, it isn't. 

see below, please!

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pastedImage_1.png

UART has 2 different working mode, one is DCE mode, the other is DTE mode.

In DCE mode, CTS_B is output .

Have a nice day!

TIC weidong sun

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ilko
Contributor I

Hi,
Thank you for the answer.
I read already about DTE and DCE, but on MCIMX8M-EVK the TX and RX are crossed:

CPU TX -> WIFI RX

CPU RX -> WIFI TX

the CTS/RTS not:
CPU CTS -> WIFI CTS
CPU RTS -> WIFI RTS

The wiring on the schematics doesn't match neither DTE nor DCE.

Regards,
Ilko Iliev

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