I'm trying to understand the HDMI capabilities of the Nexys Video Artix-7.
I don't own a board yet, so these queries are based on reading spec sheets; please excuse any errors or omissions on my part.
The FPGA on the Nexys Video is XC7A200T-1SBG484C, which supports 4 GTP transceivers at 3.75 Gbit/s [1]. However, based on my best interpretation of the Nexys Video data sheet [2] the HDMI ports aren't using the GTP transceivers. The GTPs are used for DisplayPort and FMC connector.
Given the HDMI ports aren't using the GTPs, what is the maximum data rate the FPGA can support for them?
The HDMI input has an Analog AD8195 buffer, which supports 2.25 Gbps data rate [3].
The HDMI output has a TI TMDS141 buffer, which also supports a 2.25 Gbps data rate [4].
This seems to limit the Nexys to 720p60 or 1080p30, whatever the FPGA may be capable of. Though if these rates are per TDMS channel then that's plenty for 1080p60.
However, in the Digilent HDMI demo a video format of 1080p60 is shown [5].
In summary, can someone clarify what video formats and data rates the Nexys Video is capable of on HDMI input and output?
Thanks in advance,
Will
For reference the data rate of some common HDMI formats:
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Flux
Hello,
I'm trying to understand the HDMI capabilities of the Nexys Video Artix-7.
I don't own a board yet, so these queries are based on reading spec sheets; please excuse any errors or omissions on my part.
The FPGA on the Nexys Video is XC7A200T-1SBG484C, which supports 4 GTP transceivers at 3.75 Gbit/s [1]. However, based on my best interpretation of the Nexys Video data sheet [2] the HDMI ports aren't using the GTP transceivers. The GTPs are used for DisplayPort and FMC connector.
Given the HDMI ports aren't using the GTPs, what is the maximum data rate the FPGA can support for them?
The HDMI input has an Analog AD8195 buffer, which supports 2.25 Gbps data rate [3].
The HDMI output has a TI TMDS141 buffer, which also supports a 2.25 Gbps data rate [4].
This seems to limit the Nexys to 720p60 or 1080p30, whatever the FPGA may be capable of. Though if these rates are per TDMS channel then that's plenty for 1080p60.
However, in the Digilent HDMI demo a video format of 1080p60 is shown [5].
In summary, can someone clarify what video formats and data rates the Nexys Video is capable of on HDMI input and output?
Thanks in advance,
Will
For reference the data rate of some common HDMI formats:
[1] https://www.xilinx.com/support/documentation/data_sheets/ds181_Artix_7_Data_Sheet.pdf (page 50)
[2] https://reference.digilentinc.com/_media/reference/programmable-logic/nexys-video/nexysvideo_rm.pdf
[3] http://www.analog.com/en/products/audio-video/hdmidvi-transmitters/ad8195.html
[4] http://www.ti.com/product/tmds141
[5] https://reference.digilentinc.com/learn/programmable-logic/tutorials/nexys-video-hdmi-demo/start
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