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RIALTO SBC/Interfaces and Connectors/JTAG

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!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History
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<section end=History/>
__FORCETOC__
<section begin=Body/>
==JTAG interface ==
 
''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''
''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''
=== Description ===
The JTAG interface available on the Evaluation Kit at the connector ''TBD:Jxxx''.  ''Jxx'' is signals are routed to a ''TBD:dedicated connector-type'' header connector for on the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console)RIALTO SBC PCB.
The connector is placed near the J60 mezzanine connector and J46 WiFi connector (please see the picture below).
[[File:{{{nomeRIALTO-som}}-EVBSBC-JTAG-connector.png|thumb|center|500px|JTAG connector]]
===Signals ===
{| class="wikitable"
! latexfontsize="scriptsize"| Pin#
! latexfontsize="scriptsize"| SOM Pin#
! latexfontsize="scriptsize"| Pin name
! latexfontsize="scriptsize"| Pin functionARM-20 JTAG! latexfontsize="scriptsize"| Pin Notes|-| 1| DGND| Ground| 4,6,8,10,12,14,16,18,20
|-
|1,2,4,6,,7,8,10| -JTAG_TCK| N.A.9| N.C.| Not connected
|-
| 3
| J1.189JTAG_TMS| RS232_RX7| Receive line|-| 4| JTAG_TDO| 13| |-| 5| JTAG_TDI| 5
|
|-
| 6
| JTAG_nTRST
| 3
| J1.187keep the possibility to be unconnected| RS232_TX-| Transmit line7| CPU_PORn| 15| keep the possibility to be unconnected|-| 8| JTAG_MOD
|
| Internally used as GPIO for USB OTG power enable in Host mode
|-
| 9
| -n.c.| DGND| Ground
|
|-
| 10
| JTAG_VREF
| 1
| 3V3 internal pull-up
|}
<section end=== Device mapping ===UART3 is mapped to <code>Body/dev/ttymxc2</code> device in Linux. The peripheral is used as the default serial console, both for the bootloader and the kernel. === 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
----
[[Category:RIALTO SBC]]
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