Activity

From 04/11/2017 to 05/10/2017

FO 10:08 PM Feature #8 (In Progress): Implement 4 channel ADC: Written initial support based on data sheet and simulated. Not yet built into test core or tried on real hardware.
So far all four channels sampled, but only SIO input connected to core. foft

FO 09:25 PM Feature #13: 32x speed cpu without wait states: Nope, this is not going to be so simple... Massive timing violations. foft

FO 10:15 PM Feature #14: Svideo core for first prototype: Debugged in isim to get lots of overflow/underflow/blanking/burst incorrect cases!
Added colour bars and asserts for under/overflow. Looks like we have more space than I thought to allow slightly higher luma scaling (224/256). Verifying... foft
FO 06:40 AM Feature #14: Svideo core for first prototype: Scaled luma with 64 space for chroma - when in composite mode only. No point throwing away svideo brightness.
Added composite to video selection menu - since the G pin is used for both it can't be generated together.
Built for v1 a... foft

FO 08:54 PM Feature #14: Svideo core for first prototype: Setting this up in the simulator so I can understand chroma better.
The problem seems to be that I've used all the space for luma and chroma is a sine wave +-255. For some reason it only allows space of 32 though - which is odd! Anywa... foft
FO 08:51 PM Feature #13: 32x speed cpu without wait states: I have something working on the simulator - alone. Now need to plug it into the core proper to see if it works. Will probably need some clever timequest rules too, since the read/write deadlines are different now. foft

FO 10:14 PM Feature #14: Svideo core for first prototype: Should add that this should not be done for direct chroma output for svideo... Since that is still on a 0-0.7V DAC output. foft
FO 10:14 PM Feature #14: Svideo core for first prototype: Panos tried out a new core with composite only - on green using the sync pin. Looks brighter but just black and white - on several TVS.
I think its black and white because...
Basically I re-scaled Y to use the full DAC range. Compo... foft
FO 07:58 PM Feature #14 (Closed): Svideo core for first prototype: Waiting the Chinese sun to rising, I decide to proceed with the "video mod" of our v 1.0 board. So I desolder the "vsync" pin 12 of video dac, and solder it again using a "kynar cable" to a near via, which drive directly to F15 of FPGA.
... foft

FO 10:07 PM Feature #13 (In Progress): 32x speed cpu without wait states: Trying simply feeding in the clock at twice the speed to see if it passes timing! foft

SA 09:46 PM Feature #1: Svideo sync line support: admin wrote:
> Doesn't look too hard to change. In the svideo component they do this for luma:
> ...
\
In all the cases we need to connect the sync pin of dac on a I/O of fpga?
sadosp
FO 08:35 PM Feature #1 (Resolved): Svideo sync line support: Implemented in test core, probably will need some debugging... foft

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