AFE5809: trigger signal

FENG SUN57683

Part Number: AFE5809

hi,

dose afe5809 needs a trigger signal, either an external trigger event through the TX_SYNC_IN pin or a manual trigger event through Register 0[2] , for each sample? or we just have to trigger it once and the data will come out in burst mode.

I have made a custom board, where the AFE5809 is controlled by a spartan 6 FPGA, the ADC CLK is supplied by the FPGA and is 20MHz. Currently i just want to see ADC sampled data, so I config adc registers as follow:

	ADDR[0x]	BIT	Value	Discription
1	0	0	1	Resets the device and self-clears the bit to 0. Note: Register 0 is a write only register.
2	16	0	1	Digital demodulator is disabled
3	1	15	1	Single-ended clock input
4	2	15:13	111	Ramp TEST_PATTERN_MODES
5	4	4	1	1: MSB first

after that, i write 1 to demod Register 0[2]

I can get 140MHz DCLK, but I cann't get FCLK and DOUT.

then i generate a 10MHz clk to the TX_SYNC_IN pin, but still cann't get FCLK and DOUT.

thank you!

over 7 years ago

0 Praveen Aroul over 7 years ago

TI__Mastermind 49906 points

Hello Feng,

Trigger signal is not mandatory to capture data or monitor the clocks.
Your register settings seem valid and moreover if you are getting the data clock, you should be getting the frame clock as well.

You could also validate your register settings on the AFE5809EVM with 40MHz on-board OSC clock.

0 FENG SUN57683 over 7 years ago in reply to Praveen Aroul

Intellectual 895 points

hi Praveen ,

thanks for the reply. Now I can get DCLK and FCLK both, but I still cann't get data, all I read are 0s

maybe i have to check whether the rigisters are well configed as I intent to.

So what's the nessisary condition to get an ADC output?

and what's the state when 5809 is out of reset? will it begin to output ADC samples imidiately?

I did some tests on the AFE5809EVM. I feed the adc_clk with a 10MHz clk from a signal generator, and switch the onboard clk jumper to EXT. upon powering up, i can see the DCLK and FCLK from 5809, but i cann't get data from any of the 8 dout lanes. Only after i launch the 5809EVM GUI and the software send some initial reset commands to 5809, i can get data on the dout lanes.

the problem is I that am not able the get the init file that the GUI uses to do the soft reset.

thanks!

0 FENG SUN57683 over 7 years ago in reply to Praveen Aroul

Intellectual 895 points

HI Praveen,
I have done some more tests. I connect the spi interface of the 5809EVM to my board, and write some logics in my FPGA so that the SPI command from the EVM is passed directly to 5809 on my board. Now i can successfully controll 5809 on my board and get data.
So would you mind give me the init file that the GUI use to reset 5809, or tell me where i can find it under the GUI install folder.Thanks!

0 FENG SUN57683 over 6 years ago in reply to Praveen Aroul

Intellectual 895 points

hi,

is anyone there who can answer my questions?

thanks!

0 Praveen Aroul over 6 years ago in reply to FENG SUN57683

TI__Mastermind 49906 points

Hi Feng,

Here is the link to the EVM GUI init file.

/cfs-file/__key/communityserver-discussions-components-files/73/2210.1_5F00_AFE5809_5F00_commands.txt

You should also be able to generate this file from the GUI directly. Once the GUI is started, click on 'Record Commands'. To read the initialization commands, click on 'Software Reset' button and save the commands to a file by clicking on 'Save Commands'.

0 FENG SUN57683 over 6 years ago in reply to Praveen Aroul

Intellectual 895 points

thanks a lot. I will try this and let u know how it goes.

0 FENG SUN57683 over 6 years ago in reply to Praveen Aroul

Intellectual 895 points

hi，
i have read this file and made some modifications to my init file according to it, and it works!
thanks a lot!

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AFE5809: trigger signal