Difference between revisions of "ORCA SOM/ORCA Evaluation Kit/Interfaces and Connectors/micro SD"

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(Created page with "{{subst:EVB_Interfaces_and_Connectors | nome-som=ORCA SOM | nome-peripheral = micro SD}}")
 
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!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History
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! 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
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! 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
 
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<section end="History" />
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==micro SD interface ==
 
==micro SD 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  ===
 
=== Description  ===
  
−
The micro SD interface available on the Evaluation Kit at the connector ''TBD:Jxxx''.  
+
The micro SD interface available on the Evaluation Kit at the connector J16, labelled as ''uSD'' on the bottom.  
  
−
''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).
+
J16 is a Micro-SD card header. This interface is connected to the USDHC2 controller of the i.MX8M Plus CPU.
  
  
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The following table describes the interface signals:
 
The following table describes the interface signals:
−
 
+
{| class="wikitable"
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{| class="wikitable"  
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!Pin#
−
! latexfontsize="scriptsize"| Pin#
+
!SOM Pin#
−
! latexfontsize="scriptsize"| SOM Pin#
+
!Pin name
−
! latexfontsize="scriptsize"| Pin name
+
!Pin function
−
! latexfontsize="scriptsize"| Pin function
+
!Pin Notes
−
! latexfontsize="scriptsize"| Pin Notes
+
|-
 +
|1
 +
|J15.52
 +
|SD_DAT2
 +
|Data 2
 +
|
 +
|-
 +
|2
 +
|J15.54
 +
|SD_DAT3
 +
|Data 3
 +
|
 +
|-
 +
|3
 +
|J15.46
 +
|SD_CMD
 +
|CMD
 +
|
 +
|-
 +
|4
 +
| -
 +
|VDD
 +
| +3.3 V
 +
|BOARD_PGOOD driven rail with 200mA fuse
 +
|-
 +
|5
 +
|J15.44
 +
|SD_CLK
 +
|Clock
 +
|
 
|-
 
|-
−
|1,2,4,6,,7,8,10
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|6, 12
 
| -
 
| -
−
| N.A.
+
|VSS
−
| N.C.
+
|Ground
−
| Not connected
+
|
 
|-
 
|-
−
| 3
+
|7
−
| J1.189
+
|J15.48
−
| RS232_RX
+
|SD_DAT0
−
| Receive line
+
|Data 0
−
|  
+
|
 
|-
 
|-
−
| 3
+
|8
−
| J1.187
+
|J15.50
−
| RS232_TX
+
|SD_DAT1
−
| Transmit line
+
|Data 1
−
|  
+
|
 
|-
 
|-
−
| 9
+
|9, 10, 11
 
| -
 
| -
−
| DGND
+
|SD_SHIELD
−
| Ground
+
|Shield
−
|  
+
|
 +
|-
 +
|13
 +
|J15.42
 +
|SD2_CD_B
 +
|Card detect
 +
|
 
|}
 
|}
  
 
=== Device mapping ===
 
=== 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.
+
The microSD card is mapped to <code>/dev/mmcblk1</code>. The available partitions are shown as <code>/dev/mmcblk1p1</code>, <code>/dev/mmcblk1p2</code>, etc.
  
 
=== Device usage ===
 
=== Device usage ===
  
−
To connect to the debug serial port:
+
The device can be mounted/accessed as a standard block device in Linux.
−
 
 
−
# 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:ORCA SOM]]
 
[[Category:ORCA SOM]]

Revision as of 07:57, 7 September 2021

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History
Version Issue Date Notes
1.0.0 Sep 2021 First release


micro SD interface[edit | edit source]

Description[edit | edit source]

The micro SD interface available on the Evaluation Kit at the connector J16, labelled as uSD on the bottom.

J16 is a Micro-SD card header. This interface is connected to the USDHC2 controller of the i.MX8M Plus CPU.


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

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
1 J15.52 SD_DAT2 Data 2
2 J15.54 SD_DAT3 Data 3
3 J15.46 SD_CMD CMD
4 - VDD +3.3 V BOARD_PGOOD driven rail with 200mA fuse
5 J15.44 SD_CLK Clock
6, 12 - VSS Ground
7 J15.48 SD_DAT0 Data 0
8 J15.50 SD_DAT1 Data 1
9, 10, 11 - SD_SHIELD Shield
13 J15.42 SD2_CD_B Card detect

Device mapping[edit | edit source]

The microSD card is mapped to /dev/mmcblk1. The available partitions are shown as /dev/mmcblk1p1, /dev/mmcblk1p2, etc.

Device usage[edit | edit source]

The device can be mounted/accessed as a standard block device in Linux.

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