Jetson-TK1 CSI-2 data lane configuration

Autonomous Machines Jetson & Embedded Systems Jetson TK1
1

I am going to connect a CSI-2 4 lane camera to the Jetson-TK1. But I’m not sure which camera data-lane should connect to which pin of Tegra K1.

Is there any constraint for CSI-2 pin assignment on Jetson-TK1? Or is the pin assignment configurable?

The CSI-2 camera has 4 data lanes and 1 clock lane as data0, data1, data2, data3, clk.
The following pins can be used for CSI-2 camera.

J3A2 connector    Camera port
-----------------------------
CSI_A_D0_P/N  --> for data0?
CSI_A_D1_P/N  --> for data1?
CSI_A_CLK_P/N --> for clk?
CSI_B_D0_P/N  --> for data2?
CSI_B_D1_P/N  --> for data3?
2

Hi,

I myself have this question.

I’ll be grateful if you share any advances you have on connecting a camera through the CSI interface. I’ll do it too if I get any news.

3

Tomoyuki,

Which CSI-2 4-lane camera are you using - just wondering.

Regards,
John W.

4

Hi,

To John,
Sorry, I can not mention the camera.

Anyway, let me ask again about CSI-2 data lane configuration.

The signal names, described in two documents “schematic of Jetson-TK1” and “Technical Reference Manual (TRM)”, do not match.
In the schematic the following signals are defined:

  • CSI_A_D0_N/P
  • CSI_A_D1_N/P
  • CSI_A_CLK_N/P
  • CSI_B_D0_N/P
  • CSI_B_D1_N/P
  • CSI_E_D0_N/P
  • CSI_E_CLK_N/P

The CSI_A_D[1:0] and CSI_B_D[1:0] could be a 4-Lane data signals, I think.

TRM describes, however,

  • Camera A is assigned to DSI & CSI x4 Pins (shared)
  • Camera B is assigned to CSI x4 Pins
  • Camera C is assigned to CSI x1 Pins

I think that “Camera B” might be CSI_A_D[1:0] and CSI_B_D[1:0], and “Camera C” might be CSI_E_D0.
Is my understanding correct?

And… How do I configure data lane of CSI-2 4-lane for Jetson TK1 connector?

Regards,

5

Hi Tomoyuki,

did you have any success yet?

Your assumption that CSI_A_D[1:0] and CSI_B_D[1:0] are the 4-Lane data signals sounds very reasonable, but I would prefer verifying it somewhere before making a headboard.

Maybe you already had success and could share some of your insight.

Best regards!

6

Could somebody from Nvidia who designed these two documents please comment on this. It would be very helpful. Thanks.

7

Hi Tomoyuki,

This is the pin mapping required.

J3A2 → your 4 data lanes camera B

CSI_A_CLK_N/P → CLK_N/P
CSI_A_D[0]_N/P → DATA[0]_N/P
CSI_A_D[1]_N/P → DATA[1]_N/P
CSI_B_D[0]_N/P → DATA[2]_N/P
CSI_B_D[1]_N/P → DATA[3]_N/P

CSI_E_D0_N/P & CSI_E_CLK_N/P on J3A2 is for additional 1 data lane Camera C connection.

Jetson TK1 board does not support connecting 4 data lanes Camera A since the following ball names are not connected with any of expansion I/O connectors in the schematic.

There’s no TP(Test Point) available for direct wiring from the board either.

DSI_B_D[3:0]_N/P
DSI_B_CLK_N/P

8

How is the CSI function on Jetson-TK1??
I look https://devtalk.nvidia.com/default/topic/754351, no CSI cameras are currently supported.
But in Jetson/Cameras - eLinux.org,
It show MIPI-CSI2 has been tested on Jetson-TK1.
I’m not sure the current situation for CSI function.

I wanna test a CSI 4 lane camera recently, are there more CSI control documents or porting information about CSI?

9

I got a similar problem with assigning 3 cameras with each 4 MIPI lanes to the Jetson Nano Board.

Anybody could come up with pin assignment to the J509 connector.

Thanks,