DS90UB913Q-Q1: DS90UB913Q-Q1

Hi Roi, 

Have you taken a look at the PCLK signal during this change in state? Is there a change in the PCLK frequency? 

Would you be able to share oscilloscope captures of the PCLK signal and lock? 

Additionally, would you be able to provide a register dump of the 914 when the issue is being experienced and when it is not (e.g the two modes mentioned)? 

Best,

Zoe

Hello

Attached the pclk (Yellow) and the lock (green) signals when there is no lock ( lock is blinking)

Regarding the registers, I work on it.

Roi

Hi Roi, 

Would you be able to do some explanation of this material? Is the yellow PCLK in the top right the signal from the deserializer or the serializer? Is there any change to the PCLK signal input to the 913? 

Best,

Zoe

The all picture is from the Deserializer side.

Attached the register dump.

SER_DES_reading.xlsx

Below is the PCLK from Serializer:

When the lock is fail the ISC is not working.

Roi

Hi Roi,

When lock is low, are local I2C transactions not working? If so, this would point to an issue in the power supplies of the UB914. 

Best,

Zoe

Hello Zoe

1. What can be the reson that when my sensor not supply the pclk to the DS90UB913Q we mesured 25MHZ pclk on UB914?

2. The lock is blinking and I can ead from 913/914.  Did you review my ISC registers?

Hello Roi,

The US team is currently out of office due to the US public holiday and will return on 5/28. Thank you for your patience at this time 

Best Regards,

Casey

Hi Roi,

There is an internal oscillator on the 914 which may result in the 25MHz measured PCLK. 

From the register dump, it looks like the 914 is strapped to the wrong mode. If the PCLK is at 83MHz, the 914 should be strapped to 10-bit mode. Would you be able to change this setting? In 10-bit mode, 0x1F[0]=1.

Best,

Zoe

Hi

yes , I can change this setting but It is necessary If we are working in default mode when  1F register is '0' ,?

we config i914 to 10bit by MODE Pin on Deserializer when Rmode Resistor Value is 11K, If need we will change 1F register to '1'

Roi

Hi Roi, 

To use the UB914 and UB913, they must be in compatible modes. The selected mode will change the forward channel frequency from the 914 to the 913. When using a PCLK of 83MHz, 10-bit mode is required to be used as 12-bit modes only support up to 75MHz. 

Best,

Zoe

Hi Zoe

1. We change 1F register to '1':

*In Live Video - the pclk  is not stable and fall from 83MHz to 50 MHZ and there is no output video

* In test pattern ( all data is '0' ) there is a good pclk and there is an output video.

2. 913, Reg 5[2] , we didn't read '1' in bit 2 even we configurate it by resistors.

3. On the EVB there is a pull down resistors (DIN0-11,HS, VS, PCLK,CLKIN) , It's necessary? 

4. Atttached the schematic,R51 is not connect in 914 schematic

Roi

913.pdfDes914.pdf

Hi Roi,

The register 0x1F should not be 0x00 under proper operation. When in 10-bit mode 0x1F[2] should be 1 to denote it is in 100MHz mode. If the PCLK from the imager is indeed 83MHz, the devices need to be in 10-bit mode. Have you checked the power supplies on the 914 and 913? 

To properly override the mode of the 914, 0x1F[4] must be set as well. 

Roi Kobo said:

3. On the EVB there is a pull down resistors (DIN0-11,HS, VS, PCLK,CLKIN) , It's necessary? 

On the pins listed, pull down resistors are not required.

Best,

Zoe

Hi Zoe

Yes, we check the power supply on the 914 & 913:

914: VDD is 1.8V and VDDIO= 3.3V

913: VDD is 1.8V, VDDIO=3.3V

As I wrote. I config the 10 bit mode by resistors (10K pull up and 11K pull down resistor) , why I didn't read it when the 914, 0x1F[4]  ='1'?

-> There is a power up sequence to the registers?

We config the 913&914 as below:

913:

Reg35= 0x04

Reg14 =0x00

Reg 5 = 0x20

914:

Reg1F = 0x11 

Roi

Hi Roi, 

On the 913, we would not recommend writing 0x05=0x20 or 0x35=0x04. For register 0x05, the deserializer will configure the 913 mode over the back channel on initialization. When 0x05=0x20, the serializer is preventing this configuration. Can you provide an update once this is removed from the initialization script? 

Best,

Zoe

Hi Zoe

Attached our register list.

0160.SER_DES_reading.xlsxRoi

Hi Roi,

From the register settings I don't see any errors being thrown here. If the issue is still being seen, can you elaborate on when this register dump was taken / what was the procedure doing so? I don't see any loss of lock. 

If the issue is still being seen, can you please provide a scope capture of the PCLK from the serializer, the PCLK output from the des, and the lock pin on the 914 in the same scope shot? 

Best,

Zoe

Hi Zoe

Attached the pclk on 914 and 913.

Roi

Hello Zoe

Thanks for your suppott, The board is working, the problem was on the power pin of the image sensor.

Roi