DS90UB913A-Q1: After 0x27=0x20 -> 0x00

RYO

Intellectual 2000 points

Part Number: DS90UB913A-Q1

Hi all,

Can you tell me there must be wait time after the sequence below (9.1.2 Power-Up Requirements and PDB Pin in the datasheet) until re-PLL? Is 24ms sufficient for 913A-914A after writing the register of 0x27=0x00?

If timing constraint t3 can not be assured, the following programming steps should be issued to the 913A via local I2C control (not via remote back channel) >= 10ms after the power sequence is complete. This step will cause a brief restart of the forward channel output:
• Write Register 0x27 = 0x20
• Wait >= 20ms
• Write Register 0x27 = 0x00

Regards,
RYO

over 3 years ago

0 Vijaya Ceekala over 3 years ago

TI__Intellectual 2930 points

RYO

What is the I2C clock frequency? If it is 100KHz, then there is no need for explicit wait times. You can do the following

Write 0x20 = 0x20

Read 0x20 '

Write )x20 = 0x00

Thanks

0 RYO over 3 years ago in reply to Vijaya Ceekala

TI__Intellectual 2000 points

Hi Vijaya,

I understood about I2C. The I2C speed can be below 100kHz. How about image data transmission from 913A to 914A? Is there dead time after 0x27=0x00? Or can 913A instantly send image data via FPD-Link just after being written 0x27=0x00?

Regards,
RYO

0 Vijaya Ceekala over 3 years ago in reply to RYO

TI__Intellectual 2930 points

RYO

What do you mean by instantly?If you are asking about how long does it take for 914A to receive the video after 913A is reset, then it is very system dependent.,based on the PCB, cable length etc, things can change /.,

Thanks

0 RYO over 3 years ago in reply to Vijaya Ceekala

TI__Intellectual 2000 points

Vijaya,

Does resetting 913A PLL need re-PLL time at least? I'm not asking the system dependent one. I just would like to know if tDDLT and tPLD is needed to wait in order to re-PLL at least, or issuing 0x27=0x00 makes 913A/914A ready to transmit/receive forward channel high-speed data.

Best regards,
RYO

0 Vijaya Ceekala over 3 years ago in reply to RYO

TI__Intellectual 2930 points

RYO

Yes. Issuing 0x27=0x00 makes 913A/914A ready to transmit/receive forward channel high-speed data.

Thanks

Vijay

Interface

Interface forum

DS90UB913A-Q1: After 0x27=0x20 -> 0x00