L64767 LSI Logic Corporation, L64767 Datasheet - Page 12

• Manufacturer Part Number: L64767
• Description: Smatv Qam Encoder
• Manufacturer: LSI Logic Corporation

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DVALIDIN
ERRORIN
FSTARTIN
ICLK
SSTARTIN
L64767 SMATV QAM Encoder
Clock Enable Input
This is an active HIGH, level-sensitive data signal. When
HIGH, the L64767 accepts data from DIN[7:0] on a
continuous basis. When LOW, the L64767 halts data
input to the internal FIFO buffer and other data processing
blocks. No new input from the DIN[7:0] pins is accepted.
Error Detection Flag
This is an active HIGH, level-sensitive data signal. When
an uncorrectable error occurs, ERRORIN is HIGH. The
L64767 checks the status of ERRORIN at the first bit of
a frame. If an error has occurred, the ERRORIN status is
copied to the MPEG-2 error indication bit if required.
External Sync Frame Start
This is an active HIGH, level-sensitive data signal. Driving
FSTARTIN to HIGH marks the beginning of an MPEG-2
transport packet. If the incoming bitstream contains no
unique synchronization words, you must use this pin to
indicate the frame start. Synchronization with FSTARTIN
is forced into the chip and is not flywheel stabilized. If the
sync insertion mode is programmed, the L64767 regen-
erates sync information and inserts it into the data stream
as programmed by the microprocessor interface.
Input Clock
This is a positive, edge-triggered input clock. The L64767
samples inputs DIN[7:0], DVALIDIN, ERRORIN, FSTARTIN,
and SSTARTIN on ICLK’s rising edge. ICLK is either a
byte clock or a bit clock, depending on the programming
of SERIN (bit 7 of Register 0).
Sync Sequence Start
This is an active HIGH signal that marks the beginning of
a new, fully reset sequence. If the signal’s falling edge is
evaluated, all internal sequences (inverted sync,
scrambler, interleaver, and differential encoder) are
restarted with the next block start. If SSTARTIN is never
asserted, all internal sequences run free after the reset.
This pin has an internal pull-down resistor.
Input
Input
Input
Input
Input