Difference between revisions of "ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/JTAG"

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==JTAG interface ==
 
==JTAG interface ==
−
 
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''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''
 
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''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''
 
  
 
=== Description  ===
 
=== Description  ===
  
−
The JTAG interface available on the Evaluation Kit at the connector ''TBD:Jxxx''.
+
The JTAG interface available on the Evaluation Kit at the connector ''J11.''  
  
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''Jxx'' is a ''TBD:connector-type'' header connector for the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console).
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''J11'' is a stripline header connector 2x15x2.54mm and is also used for expansion signlas.
  
  
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===Signals ===
 
===Signals ===
  
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The following table describes the interface signals:
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The following table describes the interface signals on J11 connector:
  
 
{| class="wikitable"  
 
{| class="wikitable"  
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! latexfontsize="scriptsize"| Pin#
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! latexfontsize="scriptsize" | Pin#
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! latexfontsize="scriptsize"| SOM Pin#
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! latexfontsize="scriptsize" | SOM Pin#
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! latexfontsize="scriptsize"| Pin name
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! latexfontsize="scriptsize" | Pin name
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! latexfontsize="scriptsize"| Pin function
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! latexfontsize="scriptsize" | Pin function
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! latexfontsize="scriptsize"| Pin Notes
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! latexfontsize="scriptsize" | Pin Notes
 +
|-
 +
|17
 +
|J18.62
 +
|VDD
 +
|VDD
 +
|reference voltage
 +
|-
 +
|19
 +
|J18.90
 +
|JTMS-SWDIO
 +
|JTMS-SWDIO
 +
|
 
|-
 
|-
−
|1,2,4,6,,7,8,10
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|21
−
| -
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| J18.98
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| N.A.
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| JTCK-SWCLK
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| N.C.
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| JTCK-SWCLK
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| Not connected
+
|
 
|-
 
|-
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| 3
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| 23
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| J1.189
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| J18.92
−
| RS232_RX
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| JTDI
−
| Receive line
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| JTDI
 
|  
 
|  
 
|-
 
|-
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| 3
+
| 25
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| J1.187
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| J18.96
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| RS232_TX
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| JTDO-TRACESWOO
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| Transmit line
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| JTDO-TRACESWOO
 
|  
 
|  
 
|-
 
|-
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| 9
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| 27
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| -
+
| J18.94
−
| DGND
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| NJTRST
−
| Ground
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| NJTRST
 
|  
 
|  
 
|}
 
|}
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=== Device mapping ===
 
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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.
 
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=== Device usage ===
 
−
 
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To connect to the debug serial port:
 
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# connect the DB9 adapter bracket to the J22 connector on the SBCX board
 
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# connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)
 
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# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1
 
−
 
 
----
 
----
  
 
[[Category:ETRA]]
 
[[Category:ETRA]]

Revision as of 13:15, 31 December 2020

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History
Version Issue Date Notes
1.0.0 Dec 2020 First Release


JTAG interface[edit | edit source]

Description[edit | edit source]

The JTAG interface available on the Evaluation Kit at the connector J11.

J11 is a stripline header connector 2x15x2.54mm and is also used for expansion signlas.


[[File:{Template:Nome-som-EVB-JTAG-connector.png|thumb|center|500px|JTAG connector]]

Signals[edit | edit source]

The following table describes the interface signals on J11 connector:

Pin# SOM Pin# Pin name Pin function Pin Notes
17 J18.62 VDD VDD reference voltage
19 J18.90 JTMS-SWDIO JTMS-SWDIO
21 J18.98 JTCK-SWCLK JTCK-SWCLK
23 J18.92 JTDI JTDI
25 J18.96 JTDO-TRACESWOO JTDO-TRACESWOO
27 J18.94 NJTRST NJTRST
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