[Libre-soc-dev] HDMI, DVI, DisplayPort on SBC (like Raspberry Pi) and on BMC

Cole Poirier colepoirier at gmail.com
Tue Jan 26 22:02:54 GMT 2021

On Tuesday, January 26, 2021, Luke Kenneth Casson Leighton <lkcl at lkcl.net>

> On Tue, Jan 26, 2021 at 7:54 PM Cole Poirier <colepoirier at gmail.com>
> wrote:
> > Here's my two cents on this. For the high-bandwidth low-latency
> > applications of video and 3d why don't we use on die (on package?, I'm
> > not familiar enough to know which) LPDDR4X (0.6V vs 1.1V for LPDDR4)
> > which is drastically lower power and much lower latency than off
> > external SDRAM.
> the majority of power consumption for high-bandwidth communications is
> in the multiplexing and the FIFOs just routing the incoming/outgoing
> data internally.
> i found a datasheet randomly online for a DDR3/4 PHY/Controller, the
> "maxed out" configurations (8 AXI4 Ports) were 2 watt *internal* power
> consumption at 22nm.  the "seriously dialled down" ones (1 AXI4 port,
> extremely small FIFOs) were 200mW but would be worse than useless.

I see. Unfortunately that doesn’t at all answer my question, can you please
respond directly to what I’m asking?


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