Implementation of Frequency Hopping using an external Trigger

Question

I want to test evaluate the Hopping modes and timings on the ADRV9002 Transceiver. 
 I have been able to get the hopping to work using TDD (Time Division Duplexing), i now want to use an external trigger such as the rising edge of a wave from a waveform generator to trigger a hop to the next frequency. 
 I have tried using the GPIO pins currently D-GPIO 2 however the eval board seem to be outputting a signal, the oscilloscope shows high to low fluctuations (1 & 0) states. 
 
 - What are the differences between the Hop pin, GPIO Trigger and SPI Trigger? 
 - How can I trigger hopping with an external trigger such as a waveform generator?

Any Help is appreciated, Thank you

ConradCollins · Accepted Answer

Hi, 
 We are currently auditing our engineerzone forums for questions that have not been fully answered. If any more information is needed, please reply to this post or create a new post. 
 To clarify, when using the ADRV9002 evaluation kit, GPIOs can only be controlled by either the FPGA or ADRV9002. Trying to connect an external controller could cause issues as the FPGA could be holding the GPIO line low and so an external controller can't command it. TES provides all the functionality needed to trigger these pins as described in this thread. 
 Regards, 
 Conrad)

RahulMushini · Answer

Hi Oliver, 
 Glad that your are able to hopping between the frequencies using GPIO. The reason why you were able to hop between first two frequencies is because you have used one GPIO pins which will have two outcome 0 and 1. In order to move further in the hop table, you need to connect multiple GPIO pin header (in your case for generating 00,01,10 and 11 you need two GPIO pins). In order to change the GPIO pins you can do that using the ''Control Hopping by GPIO'' . 
 
 Here you can change the HOP table index sequence and based on the number provided in the hop table index sequence the number of GPIO pins will be enable. 
 For example, the number for 'hop-table-index-sequence-8-entries' is from 0 to 3, hence two GPIO pins are enabled as shown below 
 
 One has to note that Table Select Pin is for changing the HOP table. Another example where I have changed the ' hop-table-index-sequence-8-entries ' which contain number from 0-9, hence you can see that additional pins have been enabled

Regards, 
 Rahul

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Implementation of Frequency Hopping using an external Trigger