<section begin="History" />

!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History

!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Version!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Issue Date!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Notes

|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|X1.Y0.Z0|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|Month YearSep 2021|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|TBDFirst release

<section end="History" /><section begin="Body" />

''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''JTAG interface allow the developer to access every peripheral of the SoC using a debugger.''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''It is also possible to add the ETH1 PHY to the JTAG daisy chain (with a custom BOM). The TRACE interface can be made available in alternative to the NAND or eMMC memory flash on board of the SoM.

The JTAG interface available on the Evaluation Kit at the connector ''TBD:JxxxJD1.''.

''JxxJD1'' is a ''TBD:connector-type'' 10x1x2.54mm strip header connector for the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console)it is not mounted.

! latexfontsize="scriptsize"| Pin#! latexfontsize="scriptsize"| SOM Pin#name! latexfontsize="scriptsize"| Pin nameFunction! latexfontsize="scriptsize"| Pin function'''ARM-20 JTAG'''! latexfontsize="scriptsize"| Pin Notes|-|1|DGND| -|4,6,8,10,12,14,16,18,20|For example documented on [https://www2.lauterbach.com/pdf/app_arm_jtag.pdf#page=3 Lauterbach specification]|-|2|JTAG_TCK| -|9| -|-|3|JTAG_TMS| -|7| -|-|4|JTAG_TDO| -|13| -|-|5|JTAG_TDI| -|5| -

|1,2,4,6,,7,8,10|JTAG_MOD

| N.A.'''''TBD''''' (*)| N.C.| Not connected10K pull-down inside the SoM

| 37| J1.189CPU_PORn| RS232_RX-| Receive line15 (*)| -

| 38| J1N.C.187| RS232_TX-| Transmit line| -

| 9|N.C.

| DGND| Ground-| -|10|JTAG_VREF| -|1|3V3 (BOARD_PGOOD driven signal)

 === Device mapping ===UART3 is mapped to <code>/dev/ttymxc2</code> device in Linux. The peripheral is used as the default serial console(*) optional signals, both for keep the bootloader and the kernelpossibility to be unconnected. === Device usage === To connect to the debug serial port: # connect the DB9 adapter bracket to the J22 connector on the SBCX board# connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1