Date: Wed, 26 Feb 1997 13:08:13 -0700 From: Steve Passe <smp@csn.net> To: multimedia@FreeBSD.ORG Subject: STB tuner Message-ID: <199702262008.NAA21658@clem.systemsix.com>
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Hi,
I rang out the lines on the STB card that program the addresses of
the tuner and stereo decoder.
---
The tuner's PLL (TSA551x) AD line looks to be grounded, which puts
its address at:
0xc0 (write)
0xc1 (read)
---
The stereo decoder (TDA9850) has its MAD line floating (NOT connected
to ground), so its address should be:
0xb6 (write)
0xb7 (read)
--------------
open questions:
1: is PORT bit P3 ("custom application bit") of the tuner module
attached/used for anything?
Note that I CANNOT find any output pin on the tuner for
this signal so I suspect its a moot point.
2: the tuner datasheet (FI1236) page 14, note #3, says:
I2,I1,I0 = digital info for IO ports P2,P1,P0
BUT the pll datasheet (TSA5511) page 5, table 2, says:
I2,I1,I0 = digital info for IO ports P7,P5,P4
If anyone has the "tin can" open, could they record the chip
numbers? unfortunately someone already looked at the top side
and saw no I2C chips, the chip of interest is probably
on the bottom side...
3: I need a source documenting the frequencies of "channels", ie,
for each tv channel I need to know its actual frequency.
Can anyone explain why the tuner datasheet claims support for
channels 2 thru 69, while the STB manual claims "125 channel
ready"? is that a CATV number, with CATV channels being
more tighly packed? or ???
--
Steve Passe | powered by
smp@csn.net | FreeBSD
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