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參數(shù)資料
| 型號： | STi4600 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 6 Channel Dolby AC-3 MPEG1/2 Audio Decoder(六通道音頻解碼器) |
| 中文描述： | 6聲道杜比AC - 3 MPEG1 / 2音頻解碼器（六通道音頻解碼器） |
| 文件頁數(shù)： | 6/52頁 |
| 文件大?。?/td> | 321K |
| 代理商： | STI4600 |
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STi4600
2 GENERAL DESCRIPTION
The device has 3 operating modes:
– AC-3 bitstream decoding 1 to 6 channel PCM
outputs,
– MPEG1 Layers I and II decoding to 2 PCM chan-
nel outputs or MPEG2 layers I and II multichan-
nel decoding,
– PCM modes for CD backwards compatibility, SD
PCM data processing,
A Pro Logic decoder for 4 channel surround PCM
output is available in each of the above three oper-
ating modes; it can be used for surround encoded
digital bitstreams and in PCM mode.
Additional Features
– Controllable delays for centre and surround in
programmable steps (e.g. for 48KHz, 0.3ms
steps).
– Five choices forlow frequency redirection output
configurations.
– A pink noise generator for optimal surround
sound set up.
– A Digital IEC-958 output interface to be used for
PCM or encoded bitstream data.
– Selectable serial or parallel data control inputs.
– Processing of many packetised or non-pack-
etised input formats.
– The device has a sample rate converter on chip
which enables 96KHz to 48kHz downsampling.
Control Interface
The device has 2 control interfaces:
– I C interface operating at 400kHz,
– 8-bit interface with “Wait” signal handshake and
interrupt request signal.
Data Input Interface
There are three possible ways of inputting com-
pressed data, shown in the Table below.
The compressed bitstream can be input in parallel
or serial mode depending upon the value of the
relevant register.
If serial mode is selected, data is placed on Pin
SIN, and strobed in on the rising edge of signal
DSTR. If the signal REQ is asserted, then 16 more
data bits can be input. REQ is deasserted when
the input buffer is full.REQ polarity is programma-
ble.
If Parallel mode is selected, data can be input us-
ing DSTR as described above, or by writing to the
DATAIN register usingCS. If the signal REQ is as-
serted, then two more bytes can be input.
Output Interface
The STi4600 has 2 output interfaces:
– Digital IEC958 Fully IEC958 formatted, single
ended CMOS/TTL output for:
Encoded bitstreams according to Dolby
pro-
posal for AC-3 and MPEG Audio with time
stamps,
linear PCM output (left and right channels, 16,
18, 20 & 24 bits), Zero output (Mute mode)
– PCM Audio output
Format of Input Data
I
Packetized Input Data
– MPEG1 system streams carrying MPEG1 Audio
– MPEG2 PES streams for DVD
– MPEG2 PES streams
I
Non-Packetized Input Data
– AC-3 elementary streams
– MPEG1and MPEG2 Audio elementary streams
(with or without extensions)
– Stereo PCM data from an ADC
Serial Input
DMA Mode
Parallel Input
DMA Mode
write to DATAIN
Strobed by DSTR
Strobed by CS
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