Difference between revisions of "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/>
 
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__FORCETOC__
 
<section begin=Body/>
 
<section begin=Body/>
  
 
==JTAG interface ==
 
==JTAG interface ==
−
 
−
''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''.
+
JTAG signals are routed to a dedicated connector on the RIALTO SBC PCB.
−
 
 
−
''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).
 
  
 +
The connector is placed near the J60 mezzanine connector and J46 WiFi connector (please see the picture below).
  
−
[[File:{{{nome-som}}-EVB-JTAG-connector.png|thumb|center|500px|JTAG connector]]
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[[File:RIALTO-SBC-JTAG-connector.png|thumb|center|500px|JTAG connector]]
  
 
===Signals ===
 
===Signals ===
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{| class="wikitable"  
 
{| class="wikitable"  
 
! latexfontsize="scriptsize"| Pin#
 
! latexfontsize="scriptsize"| Pin#
−
! latexfontsize="scriptsize"| SOM Pin#
 
 
! latexfontsize="scriptsize"| Pin name
 
! latexfontsize="scriptsize"| Pin name
−
! latexfontsize="scriptsize"| Pin function
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! latexfontsize="scriptsize"| ARM-20 JTAG
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! latexfontsize="scriptsize"| Pin Notes
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! latexfontsize="scriptsize"| Notes
 +
|-
 +
| 1
 +
| DGND
 +
| Ground
 +
| 4,6,8,10,12,14,16,18,20
 
|-
 
|-
−
|1,2,4,6,,7,8,10
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| 2
−
| -
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| JTAG_TCK
−
| N.A.
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| 9
−
| N.C.
+
|  
−
| Not connected
 
 
|-
 
|-
 
| 3
 
| 3
−
| J1.189
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| JTAG_TMS
−
| RS232_RX
+
| 7
−
| Receive line
+
|  
 +
|-
 +
| 4
 +
| JTAG_TDO
 +
| 13
 +
|
 +
|-
 +
| 5
 +
| JTAG_TDI
 +
| 5
 
|  
 
|  
 
|-
 
|-
 +
| 6
 +
| JTAG_nTRST
 
| 3
 
| 3
−
| J1.187
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| keep the possibility to be unconnected
−
| RS232_TX
+
|-
−
| Transmit line
+
| 7
 +
| 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
 
| 9
−
| -
+
| n.c.
−
| DGND
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|  
−
| Ground
 
 
|  
 
|  
 +
|-
 +
| 10
 +
| JTAG_VREF
 +
| 1
 +
| 3V3 internal pull-up
 
|}
 
|}
  
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=== Device mapping ===
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<section end=Body/>
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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:RIALTO SBC]]
 
[[Category:RIALTO SBC]]

Latest revision as of 14:10, 12 January 2024

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History
Issue Date Notes
2023/01/09 First documentation release



JTAG interface[edit | edit source]

Description[edit | edit source]

JTAG signals are routed to a dedicated connector on the RIALTO SBC PCB.

The connector is placed near the J60 mezzanine connector and J46 WiFi connector (please see the picture below).

JTAG connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# Pin name ARM-20 JTAG Notes
1 DGND Ground 4,6,8,10,12,14,16,18,20
2 JTAG_TCK 9
3 JTAG_TMS 7
4 JTAG_TDO 13
5 JTAG_TDI 5
6 JTAG_nTRST 3 keep the possibility to be unconnected
7 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.
10 JTAG_VREF 1 3V3 internal pull-up


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