Linux/DS90UB940-Q1: Ds90ub940-q1 mipi clk output is only 33K

user4823313

Part Number: DS90UB940-Q1
Other Parts Discussed in Thread: ALP

Tool/software: Linux

I use the platform is imx6+947+940
947 input is Single-pixel mode.output is port0
940 output 2 data lanes, 1 CSI port active

1: entering bisten mode, 940 lock pass is high but mipi clk output is only 33Khz

Switch to normal mode 940 lock pass is also high mipi clk only 33khz

Turn off 947 and enable 940 PATGEN_EN 0x64=0x11 mipi clk output 33K

2: The default value of 0x02 is 0 after each power-up 940

Please help me. It has been several months.

Thank you.

bisten mode 947 reg:

No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: 34 00 00 d2 80 00 58 00 00 00 05 00 07 20 00 00 4..??.X...?.? ..
10: 00 00 00 88 00 00 fe 1e 7f 7f 01 00 00 00 01 00 ...?..?????...?.
20: 0b 00 25 00 00 00 00 00 01 20 20 a0 00 00 a5 5a ?.%.....? ?..?Z
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
40: 14 55 00 00 80 00 63 00 00 00 00 00 00 00 00 40 ?U..?.c........@
50: 16 00 00 00 02 00 00 02 00 00 dd 20 02 06 44 35 ?...?..?..? ??D5
60: 22 02 00 00 10 00 00 00 00 00 00 00 00 00 00 00 "?..?...........
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 00 80 00 38 00 00 60 c0 00 00 00 00 00 ff 00 ..?.8..`?.......
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
e0: 00 00 80 00 28 38 00 00 00 00 00 00 00 00 00 00 ..?.(8..........
f0: 5f 55 42 39 34 37 00 00 00 00 00 00 00 00 00 00 _UB947..........

biste mode 940 reg:

0 1 2 3 4 5 6 7 8 9 a b c d e f
00: 58 04 00 f0 fe 1e 00 00 00 00 00 00 00 00 00 00 X?.???..........
10: 00 00 00 00 00 00 00 00 00 01 00 00 22 40 00 00 .........?.."@..
20: 00 00 00 20 08 00 83 84 20 00 00 00 00 00 00 00 ... ?.?? .......
30: 00 00 90 25 01 00 00 8a 00 00 00 05 20 e0 23 00 ..?%?..?...? ?#.
40: 43 03 03 00 60 88 00 00 0f 00 00 08 00 00 63 00 C??.`?..?..?..c.
50: 03 10 00 01 80 00 00 00 00 7f 20 20 00 00 00 00 ??.??....? ....
60: 00 00 00 00 10 00 00 00 00 00 00 00 00 01 00 00 ....?........?..
70: 00 00 00 07 07 08 00 00 00 00 00 00 02 00 00 00 ...???......?...
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
a0: 00 00 84 00 00 00 00 00 00 00 00 00 00 00 00 00 ..?.............
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 00 00 00 00 00 00 00 c0 00 00 00 00 00 00 00 ........?.......
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
f0: 5f 55 42 39 34 30 00 00 00 00 00 00 00 00 00 00 _UB940..........

normal mode 947 reg:

0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: 34 00 00 d2 80 00 58 00 00 00 22 00 17 20 00 00 4..??.X...".? ..
10: 00 00 00 88 00 00 fe 1e 7f 7f 01 00 00 00 01 00 ...?..?????...?.
20: 0b 00 25 00 00 00 00 00 01 20 20 a0 00 00 a5 5a ?.%.....? ?..?Z
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
40: 14 55 00 00 80 00 63 00 00 00 00 00 00 00 00 40 ?U..?.c........@
50: 16 00 00 00 02 00 00 02 00 00 dd 20 02 06 44 35 ?...?..?..? ??D5
60: 22 02 00 00 10 00 00 00 00 00 00 00 00 00 00 00 "?..?...........
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 00 80 00 38 38 00 60 c0 00 00 00 00 00 ff 00 ..?.88.`?.......
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
e0: 00 00 80 00 28 38 00 00 00 00 00 00 00 00 00 00 ..?.(8..........
f0: 5f 55 42 39 34 37 00 00 00 00 00 00 00 00 00 00 _UB947..........

normal 940 reg:

0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: 58 04 00 f0 fe 1e 00 34 00 00 00 00 00 00 00 00 X?.???.4........
10: 00 00 00 00 00 00 00 00 00 01 00 00 23 40 00 00 .........?..#@..
20: 00 00 40 20 08 00 83 84 01 00 00 00 00 00 00 00 ..@ ?.???.......
30: 00 00 90 25 01 00 00 8a 00 00 00 00 20 e0 23 00 ..?%?..?.... ?#.
40: 43 03 03 00 60 88 00 00 0f 00 00 08 00 00 63 00 C??.`?..?..?..c.
50: 03 10 00 01 80 00 00 00 00 7f 20 20 00 00 00 00 ??.??....? ....
60: 00 00 00 00 10 00 00 00 00 00 00 00 00 03 00 00 ....?........?..
70: 00 00 00 07 07 08 00 00 00 00 00 00 02 00 00 00 ...???......?...
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
a0: 00 00 84 00 00 00 00 00 00 00 00 00 00 00 00 00 ..?.............
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 00 00 00 00 00 00 00 c0 00 00 00 00 00 00 00 ........?.......
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
f0: 5f 55 42 39 34 30 00 00 00 00 00 00 00 00 00 00 _UB940..........

over 7 years ago

0 Palaniappan Manickam over 7 years ago

TI__Genius 10475 points

Hello,
I am not sure what the question is. It looks like BIST is working ok since you are saying both LOCK and PASS are high.

0 user4823313 over 7 years ago in reply to Palaniappan Manickam

Prodigy 230 points

hello

Whether it will be due to the wrong timing of power-up？

I measured the power-up sequence is problematic, but i2C and BIST work are normal

please help me

0 Palaniappan Manickam over 7 years ago in reply to user4823313

TI__Genius 10475 points

Can you explain what is problematic about the power up sequence?
It is important to follow the power up sequences for our devices as specified in the datasheets.
Also from a system point of view the serializer should be powered up first and sending data to the deserializer before powering up the deserializer so it is receiving valid data it can lock to when the deserializer is released from powerdown.

0 user4823313 over 7 years ago in reply to Palaniappan Manickam

Prodigy 230 points

The power up sequence is this VDD33 VDDIO VDD12 is powered on at the same time, and pdb is controlled by software.

We will need to prepare a version of VDD33 VDDIO VDD12 PDB on the hardware through software controls. Is this okay?

0 Steven(Shenzhen) Shi over 7 years ago in reply to user4823313

TI__Mastermind 30515 points

Shiyong,
1. please make sure the power on sequence meet the d/s guideline;
2. regarding on your 33K CSI-CLK output, it seems your test method is not GOOD, can you increase the scope sampling rate and retest it? it should have ~200mV (single) high speed clock signals.
3. Yes, you can enable the pattern generation to check the UB940 output, you can configure it based on TI's ALP tool.

best regards,
Steven

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Linux/DS90UB940-Q1: Ds90ub940-q1 mipi clk output is only 33K