MB86391 Datasheet, PDF (42/69 Pages) Fujitsu Component Limited. – MPEG2 1chip Audio/Video Encoder

FUJITSU LIMITED
Proprietary and Confidential
3.6 Bit Stream Output Port
The bit stream output port is compatible with various transfer modes described next:
(a) 27 MHz sync mode
This mode is for storage function products. The PCR(SCR) is made by the calculated value from
bit-stream and datasize.
BCLK(O)
STREQ(I)
STEN(O)
STDATA(O)
TSPSSYNC(O)
Valid Valid
Valid Valid
Fig. 3.6a: 27 MHz sync mode timings
(1) When ready to receive streams, set STREQ to 'H.'
(2) When valid data exists, the MB86391 sets STEN to ’H’ at STDATA to instruct data fetching. It
also sets the TSPSSYNC signal simultaneously to 'H' at the sync byte "0x47" if the stream is TS,
and at pack start code "0x000001BA" or at the leading byte of the program end code
"0x000001B9" if the stream is PS.
Notes: There is an instance during which two pieces of data are output at maximum
even if STREQ is set 'L.'
Limit the duration during which STREQ is set to ’L’ while encoding to a few tens
of clocks. The bit rate must also be maintained on the average (The MB86391
is equipped with an internal buffer to temporarily store bit streams. However,
the buffer fails if bit streams are not read for a lengthy period of time.)
(b) Handshake mode
This mode is for storage function products. The PCR(SCR) is made by the calculated value from
bit-stream and datasize.
BCLK(O)
STREQ(I)
STEN(O)
STDATA(O)
TSPSSYNC(O)
Valid
Valid
Fig. 3.6b: Handshake mode timings
MB86391
Product Specification
Rev. 1.1
12, November 2001
38