TDA8961 Philips Semiconductors, TDA8961 Datasheet - Page 13

• Manufacturer Part Number: TDA8961
• Description: ATSC/NTSC digital TV front-end chipset
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Transport stream interface
I
The transport stream interface performs the following
functions:
P
The functions of the transport stream interface outputs are
summarized in Table 3. It should be noted that different
source decoder devices may have different uses for the
PDOERR output; its polarity is programmable using
I
P
Figure 5 shows the timing diagram for the parallel output
format. The PDOSYNC signal indicates the occurrence of
the sync byte in the packet and is only HIGH for one clock
period. The polarity of the PDOVAL and PDOERR signals
is programmable via I
respectively; Fig.5 shows their default polarities.
The PDOVAL signal is active for the duration of the
188 bytes of the transport stream packet. When the
188 bytes have been transferred, the PDOVAL signal
goes LOW for at least ten PDOCLK cycles during which,
Table 3 Transport stream interface outputs
All pins are 3-state outputs.
Note
1. In serial output format, only pin PDO0 (LSB) is used to output the data.
2000 May 19
NTRODUCTION
2
PDOCLK
PDOVAL
PDO7 to PDO0
PDOSYNC
PDOERR
INNING
C-bus bit FPBP (see Table 14).
ARALLEL OUTPUT FORMAT
Buffers the data from the Reed Solomon decoder and
de-randomizer section
Inserts the MPEG sync byte at the start of every packet
Indicates error conditions using a
transport_error_indicator bit in the packet header and
the error signal output PDOERR.
Outputs either a serial or a parallel output format.
ATSC Digital Terrestrial TV
demodulator/decoder
SYMBOL
clock signal for MPEG-2 packet data bytes (parallel and serial)
indicates a valid data signal
packet data bits 7 to 0 (8-bit wide output bus)
indicates the start of a packet; goes HIGH at the start of a packet and stays HIGH during the first
byte, otherwise known as the sync byte
indicates packet error; goes HIGH (I
Reed Solomon decoder found more errors than it could correct
2
C-bus bits FDVP and FPBP
2
C-bus bit FPBP = 1) for every packet (188 bytes) in which the
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when used with DVB devices, the parity bytes are
transferred; when used with non-DVB devices, zeroed
parity bytes and field sync data are transferred.
The period when the PDOVAL signal is LOW can vary, but
will be a minimum of ten PDOCLK cycles. Due to the
averaging operation of the FIFO, the number of parity
bytes transferred can vary slightly. The PDOCLK signal
runs continuously and is not affected by a reset. In parallel
output format, it has a frequency of 3 MHz.
When the TDA8961 is trying to acquire a channel, the
PDOERR signal goes HIGH (I
occurs, the PDOVAL signal stays LOW.
S
Figure 6 shows the timing diagram for the serial output
format. The LSB of the 8-bit PDO data bus is used to
output the MPEG-2 transport stream packets.
The PDOSYNC signal indicates the occurrence of the
sync byte in the packet and is only HIGH during
8 PDOCLK cycles. The polarity of the PDOVAL and
PDOERR signals is programmable via I
and FPBP respectively; Fig.6 shows their default
polarities.
The PDOVAL signal is active for the duration of the
188 bytes of the transport stream packet. When the
188 bytes have been transferred, the PDOVAL signal
goes LOW for a period corresponding to the duration of the
parity and field sync information. Figure 6 shows the
PDOERR signal is HIGH for the whole packet length
indicating that the packet contains errors. The PDOCLK
signal has a frequency of 27 MHz.
ERIAL OUTPUT FORMAT
FUNCTION
(1)
2
C-bus bit FPBP = 1). If this
Objective specification
2
C-bus bits FDVP
TDA8961