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DS90UB913A/14A interface GPIO Query

santhosh raju
Intellectual 305 points

Hello,

The application that is intended to develop makes use of image sensor which provides 12 bit parallel data output with HSYNC, VSYNC and PCLK, which are to be  interfaced with the SER. The operating mode is "no external oscillator " and PCLK is the clock source. The LVDS output from the SER is connected to 2 meter STP cable which on the other end is connected to the DES (DS90UB914a). 

1. Can the GPIOs in DES be connected to the processor's GPIO to receive commands that will be passed to the image sensor through the GPOs of the SER?

2. The serializer and deserializer are prohibited from using I2C interface, totally. On other words, no connection will be made between SERDES's I2C with the processor or image sensor. The SER has to sample the data at the "Rising Edge" of the PCLK, that is, the register TRFB  should be 1 and  in the DES, RRFB should be 1. Is there any way to set these registers without using I2C? What will be the default state of these registers?

3. It is given in the data sheet that in the absence of PCLK, the internal oscillator will be used as reference clock. In this application, PCLK is the source of clock. When the PCLK is stopped for a small period of time(like when image sensor is reset or standby), what happens to the internal oscillator?

Thanks,

San. 

  • 0
    TI__Genius 13475 points
    San
    1. Yes, the GIOPs in the DES can be connected to a processor GPIO to allow the processor to pass signals to the Image Sensor - alternately, the processor can communicate to the image sensor through the I2C bus, either directly with the I2C bridge throught he deserializer and serializer, or by having the processor use the GPIO pins on the serializer to communicate with the image sensor.
    The only way to read and write the registers within the SerDes components is via the I2C bus.
    When PCLK is stopped, the serializer will switch over to it's internal oscillator to maintain the link between the serializer and the deserializer.