TMS320C6A8168 EVM circuits / VGA output

Graeme Parker

Regarding the 320C6A8168 eval board schematics.

On the "Analog Video Out" (SH37) page there is a VGA connector. This only appears to have RGB and GND connections. There are no connections for V/HSYNC yet both are available from the DSP. Any idea why this is? Is it a driver issue?

Thanks for any comments.

over 14 years ago

0 Steve Clynes over 14 years ago

TI__Mastermind 43875 points

There are no sync outputs available from the chip.

Only sync on green is supported.

BR,

Steve

0 Graeme Parker over 14 years ago in reply to Steve Clynes

Expert 1265 points

Shame!

What signals are really on pins AN9 and AM9? These are in my datasheet as VOUT[0]_VSYNC and HSYNC, and described as "Video Output 0 Vertical Sync output. This is the

discrete vertical synchronization output."

I'm getting more and more confused :(

0 Steve Clynes over 14 years ago in reply to Graeme Parker

TI__Mastermind 43875 points

Graeme,

These are sync outputs but for one of the digital out ports, not the analog DAC port.

There are 4 independent outputs...

1) HDMI/digital VOut[1]
2) HD DACs
3) Digital VOut[0]
4) SD DACs/RF output

Each output is completely independent of the others.

BR,

Steve

0 Graeme Parker over 14 years ago in reply to Steve Clynes

Expert 1265 points

Thanks.

Do you rhink it is possible to run a digital output port at the same rate as an SD DAC output, AND have the syncs, er, in sync?

I see you mentioned the RF output pin. Are there any more details on this. My datasheet has this as RSVD.

0 Steve Clynes over 14 years ago in reply to Graeme Parker

TI__Mastermind 43875 points

This is something which has been discussed but not tried yet.

It is potentially possible to synchronize 2 video ports but until we actually try it I can't comment.

I think that the RF output has been de-specced.

BR,

Steve

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TMS320C6A8168 EVM circuits / VGA output