MSX HDMI mutlimedia card

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By spacemoai1973

Master (165)

Аватар пользователя spacemoai1973

22-04-2016, 15:47

Me too.! Cool

By maxis

Champion (512)

Аватар пользователя maxis

13-06-2016, 01:53

Small update.

I have some good and also not very good news.

Recently I had some difficulties in simplifying the Procyon design and making it mass production ready.
Here are two boards:

On the left - the well debugged board with the discrete VCO (voltage controlled oscillator), which has some components to be tuned manually (step to be avoided in mass production).
On the right - the new generation HDMI PLL elements with the solid state VCO (no tuning required).

Now, the good and old discrete VCO has an ultra low noise:

However, the new VCO has a terrible noise, but despite this the PLL holds the lock. The result - the image is stable on the HDTV, but comes and goes on the PC monitor.
Below is the spectrum of the solid state VCO.

So, to be worked around. Still quite a lot of effort to be spent on it.

On the bright side - Procyon passed HDMI ESD (electrostatic discharge) tests and compliance. Now the HDMI cables became hot-pluggable.

By Joybit

Supporter (10)

Аватар пользователя Joybit

13-06-2016, 02:52

Wow! This is an impressive project to say the least. Best of luck to you on all future work on this, looking forwards to trying one out myself Wink

By PingPong

Prophet (3555)

Аватар пользователя PingPong

13-06-2016, 21:58

@maxis: what about v9958 emulation? does the h-scroll work fine?

By maxis

Champion (512)

Аватар пользователя maxis

13-06-2016, 23:04

PingPong wrote:

@maxis: what about v9958 emulation? does the h-scroll work fine?

I haven't finished the v9958 model yet. H scroll works, but still I've got to implement the interlaced modes, YJK modes and multicolor mode (screen 3).
However, these are the little details. The most important one is -> the coilless PLL.
The one with coils does require the shielding box, which will increase the assembly complexity.
Therefore, I need to get the new one w/o any magnetics working. This way it can run without any shielding boxes.

Also, I've got a major change in the non-real time peripheral support. In order to do that, the USB device support, USB OTG, FPGA DFU and SDHC are run by Cortex M4. It is cheaper and more flexible to do this on ARM than on Z80+FPGA itself.

By maxis

Champion (512)

Аватар пользователя maxis

14-06-2016, 00:35

Joybit wrote:

Wow! This is an impressive project to say the least. Best of luck to you on all future work on this, looking forwards to trying one out myself Wink

Thank you Joybit. Now it is much closer to the final version.

By PingPong

Prophet (3555)

Аватар пользователя PingPong

14-06-2016, 21:21

maxis keep up the work. it will be a shame if this project come to a stop...

By maxis

Champion (512)

Аватар пользователя maxis

15-06-2016, 02:09

PingPong wrote:

maxis keep up the work

Currently, I'm working on the simplified version, which is mass production friendly. Since this is the industry first direct TV to HDMI genlock, there are many problems in the analog domain. And there are no ready to use components around.
I've tested 11 different solid state VCOs in the last 18 months. Despite the tonns of time invested, so far the only one had an acceptable performance and stability, but it requires a very careful choice of the passive components and shielding.
I still have to test the last inductorless VCO candidate the next week.
If I fail with this test, then the current well working solution will be industrialized...

By maxis

Champion (512)

Аватар пользователя maxis

19-06-2016, 18:37

Latest news:

The new VCO was prototyped.

It has very visible spurs:

But despite the phase noise, the image is very stable on all the monitors and switchover between screen modes is quick.
I'll prototype one more discrete oscillator and then will make a choice. The beauty of the current design - absence of the EMI shield.

By AxelStone

Prophet (2764)

Аватар пользователя AxelStone

19-06-2016, 19:28

Cool! Finally what's implemented in the board?

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