參數(shù)資料
型號(hào)： 935261222557
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： PLASTIC, SOT-319, QFP-64
文件頁(yè)數(shù)： 6/36頁(yè)
文件大小： 203K
代理商： 935261222557
1999 Jun 14
14
Philips Semiconductors
Preliminary specication
ATSC 8-VSB demodulator and decoder
TDA8960
The DATACLK signal is the 5.38 MHz demodulator output
clock. It is derived from the system clock of 21.52 MHz.
A few remarks can be made about the DATACLK signal:
If a reset is applied, DATACLK becomes LOW; it
remains LOW until reset is released and the symbol
timing recovery block has detected the synchronization
signals
After a channel change the DATACLK signal stops; it
starts again after the system has been locked on to a
valid signal
If the Reed Solomon decoder produces an invalid
transport packet and the ERROR signal is asserted the
DATACLK signal continues to change state
If the sync recovery block is not able to detect the field
sync or data segment sync, DATACLK will not change.
The DATAVALID signal indicates valid demodulator output
data or one valid MPEG-2 transport packet. It is active
HIGH for 188 bytes, or 34.9
s. The zero bytes to be sent
after the 188 valid bytes of the transport packet can be
considered to be zeroed parity bytes.
SOP or start of packet signal is HIGH during the first byte
of the packet.
The ERROR signal indicates that the transport packet
contains uncorrectable output. The ERROR signal
becomes HIGH in the following situations:
If the Reed Solomon decoder is unable to correct all
errors in a transport packet
After a reset has been applied, the ERROR signal is
asserted; it remains HIGH until a valid transport packet
is produced by the demodulator
If the demodulator is out of sync, thus can not detect the
field sync and segment sync in the incoming data
stream.
The ERROR signal can be asserted in the middle of a
transport packet.
Sync byte and transport error indicator
The structure of a transport packet header is shown in
Fig.6. For the VSB demodulator only the first two bytes of
the so called transport packet header are important.
The first byte in each header of a transport packet is the so
called MPEG-2 packet synchronization byte (sync byte).
As specified in the MPEG-2 standard, this sync byte must
have the same value for all packets. The VSB demodulator
IC sets this byte for each outgoing transport packet to 47H.
The MSB of the second byte in the transport packet is the
transport_error_indicator bit. It indicates that the Reed
Solomon decoder was not able to correct all errors and the
transport packet has invalid data.
Fig.6 The structure of a transport packet header.
handbook, full pagewidth
MGR605
payload
(if present)
adaptation field
(if present)
0
MSB
sync byte
transport_error_indicator
transport packet header
1st byte
4th byte
1
0
1
LSB
188 bytes
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