12 Sep
2002
12 Sep
'02
6:38 p.m.
Tony Duell wrote:
Oops - my bad. I think the SAA5281 has the RAM integrated, IIRC.
The thing that seems interesting is that the TTX controller
IDs it
as an
How do you mean? What exactly tells you it's an SAA52xx chip? The I2C address
is the same as some of the chips from the SAA52xx series.
I'm planning to build a video generator using a PIC and
then connect Sync to
the Cub653, CVBS to the TTX board, then connect R.G.B. from the TTX board to
the monitor. In theory that *should* get me a picture. I've got an I2C
interface for my laptop that still works, so I have some way of controlling
it.
Later.
--
Phil.
philpem(a)dsl.pipex.com
http://www.philpem.dsl.pipex.com/
Tony Duell
wrote:
I thought the 5246 integrated the VIP and the ECCT (Enhanced Computer
Controlled Teletext -- the SAA5243) and still used an external RAM
chip. Texas CFxxxx numbers tend to be custom ASICs :-(.
No chance of
getting a data sheet on those.
*ACK.
What also bothers me is the lack of RAM. The
Philips decoder uses
the SAA5231 VIP (Video Input Processor -- this is essentially the
'data slicer' and is mostly analouge), the SAA5243 Teletext
decoder/display chip _and an 8K RAM_.
There are Philips chips with built-in RAM,
though. SAA5246 IIRC. Anyone got a
Ferguson T14T or Thomson TX91 service manual? I need
the part
It's a bit modern for me :-(. However, a TV service manual is _not_
going to include any info on the commands that flow between various
ICs. You will not get a list of registers on the I2C bus and their
contents, for example. SAA52xx series
TTX controller. The original schematic that I had (a
VERY bad
If you suspect it's a 5243 or similar, and if you know it's
controlled by an I2C bus, have you tried enabling the external sync
output by writing to the appropriate bit in one of the mode control
registers and then tried looking for a composite sync signal on the
pins of the larger IC?