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PICList Thread
'[EE] Video overlay chips (OSD text)'
2006\08\18@141231 by M. Adam Davis

face picon face
On 5/14/06, Robert Rolf <spam_OUTRobert.RolfTakeThisOuTspamualberta.ca> wrote:
> BOB III is nice but I'd like to know what chip he's using.

On the Bob-4 page he states:
"BOB-3 customers should transition to BOB-4 without delay. BOB-3
shipments beyond September of 2006 cannot be guaranteed. Note that
changes to module pinout have occurred, relative to BOB-3. Download
the current BOB-4 Application Guide (see below) for full details."

So it appears that whatever chip he's using for bob-3 is now going EOL
as well.  The Bob-4 is the same price, though, and adds bitmap
graphics, vector drawing, proportional fonts, etc.

Looks like an FPGA, microcontroller, and memory.

-Adam

2006\08\19@075031 by Bob Axtell

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M. Adam Davis wrote:
> On 5/14/06, Robert Rolf <.....Robert.RolfKILLspamspam@spam@ualberta.ca> wrote:
>  
>> BOB III is nice but I'd like to know what chip he's using.
>>    
>
> On the Bob-4 page he states:
> "BOB-3 customers should transition to BOB-4 without delay. BOB-3
> shipments beyond September of 2006 cannot be guaranteed. Note that
> changes to module pinout have occurred, relative to BOB-3. Download
> the current BOB-4 Application Guide (see below) for full details."
>
> So it appears that whatever chip he's using for bob-3 is now going EOL
> as well.  The Bob-4 is the same price, though, and adds bitmap
> graphics, vector drawing, proportional fonts, etc.
>
> Looks like an FPGA, microcontroller, and memory.
>
> -Adam
>  
It'll be pricey (the FPGA) but it looks like the BOB4 is a fix.

I knew his BOB3 Mitsubitsi (sp?) character generator was going tits up, too.

--Bob

2006\08\21@100321 by M. Adam Davis

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He's listing it at the same price ($99) as the BOB3.  You can use a
pretty small/cheap FPGA that simply becomes a memory-->video
converter.  The  microcontroller simply waits for vertical sync to
update the memory, and you can do all the graphics and text functions
in the micro.

Maybe use a little bigger fpga and put in dual access to the RAM
(since the video generator only reads there should never be a
conflict).

Of course, I'd like to see the BOB4 down in the $20 area, it's just a
video controller.

-Adam

On 8/19/06, Bob Axtell <engineerspamKILLspamneomailbox.com> wrote:
{Quote hidden}

> -


'[EE] Video overlay chips (OSD text)'
2008\01\04@220722 by Zik Saleeba
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Digging up this old thread from 2006...

I've been keeping my eyes out for OSD chips for quite some time now.
It seems that there is a new alternative to the ST5730A.

"The MAX7456 single-channel monochrome on-screen display (OSD)
generator lowers system cost by eliminating the need for an external
video driver, sync separator, video switch, and EEPROM. The MAX7456
serves all national and international markets with 256
user-programmable characters in NTSC and PAL standards. The MAX7456
easily displays information such as company logo, custom graphics,
time, and date with arbitrary characters and sizes. The MAX7456 is
preloaded with 256 characters and pictographs and can be reprogrammed
in-circuit using the SPI™ port.

"The MAX7456 is available in a 28-pin TSSOP package and is fully
specified over the extended (-40°C to +85°C) temperature range."

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5516

Yes, it's Maxim. But at least you can buy it from digikey for $12 in
2500+ quantity.

Cheers,
Zik

2008\01\05@011012 by David P Harris

picon face
They even have a eval kit for $100 which basically gives you a
freestanding unit!

David

Zik Saleeba wrote:
{Quote hidden}

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