topic Re: RT1020 EVK Questions about Schematic (Pins used multiple times) in i.MX RT Crossover MCUs

RT1020 EVK Questions about Schematic (Pins used multiple times)

f_und_e — Tue, 02 May 2023 09:31:27 GMT

Hi there,

I got a couple of questions about the schematic of the RT1020 Evaluation Kit. There are quite a few pins which are connected to multiple different periphals. I totally understand that this is a demo board and that it is supposed to support as many features as possible, but there are a few odd ones:

ENET-RST and JTAG-TDO
These two are both connected to pin AD_B0_04. Isn't that an issue for example during debugging with JTAG and using Ethernet at the same time?

On an own design it should be possible to use another pin for ENET_RST because it is software defined and not "directly" connected to the ethernet periphal, or am I wrong?

ENET and SPI on the Arduino Header
These seem to colide aswell on pins AD_B0_11 / 12 / 13 / 10. I think that's due to constraints being a demo board?

Thank you for your patience.
All the best

Re: RT1020 EVK Questions about Schematic (Pins used multiple times)

EdwinHz — Wed, 03 May 2023 23:22:49 GMT

Hi @f_und_e,

As described on the MIMXRT1020 EVK Board Hardware User’s Guide, this boards is configured to support SWD by default, rather than JTAG. Following this principal, there is no issue when debugging and configuring the ENET module and it's pins. With respect to the other collisions on the Arduino Header, these are just constraints from the demo board, as you mention.

BR,

Edwin.

Re: RT1020 EVK Questions about Schematic (Pins used multiple times)

f_und_e — Thu, 04 May 2023 11:33:46 GMT

Thank you very much!