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AXEL ULite SOM/AXEL ULite Evaluation Kit/Interfaces and Connectors/JTAG

1,812 bytes removed, 13:37, 19 July 2021
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==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''JD1. By default, the connector is not populated.
''Jxx'' JD1 is a ''TBD:connector-type'' 10x2.54mm header connector for the RS232 two-wires UART3 port, JTAG signals used for debug purposes (bootloader and operating system serial console)togheter with a JTAG debugger.
[[File:{{{nome-som}}AXEL_ULite-EVB-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 function
! latexfontsize="scriptsize"| Pin Notes
|-
!Pin# !Pin name!Function!Notes|-|JD1.1,|| DGND || - || -|-|JD1.2,|| JTAG_TCK || - || -|-|JD1.3 || JTAG_TMS || - || -|-|JD1.4,|| JTAG_TDO || - || -|-|JD1.5 || JTAG_TDI || - || -|-|JD1.6,,|| JTAG_nTRST || - || optionally connected (mount option)|-|JD1.7,8,10|| CPU_PORn || - || optionally connected (mount option)| -| NJD1.A.8 || N.C.| Not connected| - || -
|-
| 3JD1.9 || J1N.C.189| RS232_RX| Receive line- || -
|-
| 3JD1.10 || JTAG_VREF | J1.187| RS232_TX- | Transmit line| 3V3 (SOM_PGOOD driven signal)
|-
| 9
| -
| DGND
| Ground
|
|}
 
=== Device mapping ===
UART3 is mapped to <code>/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:AXEL ULite]]
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