SAA7205 Philips Semiconductors, SAA7205 Datasheet - Page 19

• Manufacturer Part Number: SAA7205
• Description: MPEG-2 systems demultiplexer
• Manufacturer: Philips Semiconductors

Philips Semiconductors
7.6
The Generic Data Filter (GDF) is connected to the General
Purpose interface, which shares its output bus
GPO7 to GPO0 with the high speed data interface.
This output can be used to interface with the Philips
SAA7201 video decoder. The GDF does not filter at all, it
merely passes the entire transport stream to the output in
byte format. The filter generates a GPST signal, which is a
gated byte clock, defined by a fixed high time (t
a minimum low time (t
strobe signal, the filter generates a GPV signal which can
be used in combination with the continuous DCLK to select
valid bytes, should a continuous clock be needed.
The filter furthermore generates a packet sync byte
indicator (GPSYNC).
It should be noted that the HS filter is programmed to
section mode (see Table 4), the general purpose output is
not available.
1997 Jan 21
handbook, full pagewidth
MPEG-2 systems demultiplexer
Interfacing to Philips SAA7201 video decoder
DMUX
CLKOL
) (see Fig.9). In addition to the
8
GPO7 to GPO0
HSSYNC
DCLK
Fig.8 High speed data output format.
HSV
HSE
CLKOH
1 byte
) and
PID matched data
19
t CLKOH
The general purpose interface is bidirectional and can
therefore serve as an alternative transport stream input to
the demultiplexer. The mode of the general purpose
interface is set by configuring the ‘GP_direction’ bit
(input = 1, output = 0, address 0x0700, see Table 13).
The GP pins have the following meaning when configured
to operate as inputs:
1 byte
GPO7 to GPO0 = PKTDAT7 to PKTDAT0
GPST = PKTBCLK
GPSYNC = PKTSYNC
GPV = PKTDATV
HSE = PKTBAD.
1 byte
non-matching PID
1 byte
t CLKOL
Preliminary specification
SAA7205H
MGG769