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i.MX6DQ GPIO_16 pin to use IEEE1588 and JTAG.

Question asked by Satoshi Shimoda on Nov 20, 2014
Latest reply on Nov 20, 2014 by Yuri Muhin

Hi community,


I have some questions about i.MX6DQ IEEE1588 and JTAG.

Please see my questions as below.



Please see revision history in MCIMX6DQ-SDP schematics.

It says "Moved I2C3 SDA from GPIO_16. This pin must be unconnected for Ethernet 1588 (time stamp) functionality to work".


Next, please see ERR005895 in IMX6DQCE (Rev.4).

It says "Due to an integration issue, the ENET 1588 clock and Channel 2 event capture/compare signal are both connected to the same GPIO16 pin.".

According to this description, GPIO_16 is not unconnected for Ethernet 1588.


Which is correct?




GPIO_16 pin is muxed JTAG_DE_B also, and JTAG_DE_B and ENET_1588_EVENT2_IN cannot replace to other pad.

So customer can use either of the two function, is this correct?

Or user should assign GPIO_16 pad to JTAG_DE_B if they want to use both JTAG and IEEE1588 since GPIO_16 is not able to be used for IEEE1588 by ERR005895?



Best Regards,

Satoshi Shimoda