Software has to know which TIA channel was used for a particular capture.
Define an additional dummy ADC channel which will provide this
information. Currently this channel is always enabled.
This commit was created by squashing the following commits, these
messages were kept just for sake of history:
ad9694_500ebz: Mirror the SPI interface to FMCB
ad9694_500ebz: Set transceiver reference clock to 250
ad9694_500ebz: Allow to configure number of lanes, number of converters
and sample rate
axi_ad9694: Fix number of lanes, it must be 2
ad9694_500ebz: Update the mirrored spi pin assignments
ad9694_500ebz: Gate SPI MISO signals based on chip-select
ad9694_500ebz: Set channel pack sample width
ad9694_500ebz: Change reference clock location
ad9694_500ebz: Remove transceiver memory map arbitration
ad9694_500ebz: Ensure ADC FIFO DMA_DATA_WIDTH is not larger ADC_DATA_WIDTH
ad9694_500ebz: Adjust breakout board pin locations
ad_fmclidar1_ebz: Rename the ad9694_500ebz project
ad_fmclidar1_ebz: Fix lane mapping
ad_fmclidar1_ebz: Delete deprecated files
ad_fmclidar1_ebz: Integrate the axi_laser_driver into the design
ad_fmclidar1_ebz: OTW is an active low signal
ad_fmclidar1_ebz: zc706: Fix iic_dac signals assignment
ad_fmclidar1_ebz: Switch to util_adcfifo
ad_fmclidar1_ebz: Enable synced capture for the fifo
ad_fmclidar1_ebz/zc706: Enable CAPTURE_TILL_FULL
ad_fmclidar1_ebz/zc706: Reduce FIFO size to 2kB
ad_fmclidar1_ebz: Laser driver runs on ADC's core clock
ad_fmclidar1_ebz_bd: Delete the FIFO instance
Because the DMA transfers are going to be relatively small (< 2kbyte),
the DMA can handle the data rate, even when the frequency of the laser
driver pulse is set to its maximum value. (200 kHz)
The synchronization will be done by connecting the generated pulse to
the DMA's SYNC input. Although, to support 2 or 1 channel scenarios, we
need to use the util_axis_syncgen module to make sure that the DMA
catches the pulse, in cases when the pulse width is too narrow. (SYNC is
captures when valid and ready is asserted)
Also we have to reset the cpack IP before each pulse, to keep the DMA buffer's
relative starting point in time fixed, when only 2 or 1 channel is
active.
sergiu arpadi
Istvan Csomortani