參數(shù)資料
型號(hào)： SAA2520GP
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Stereo filter and codec for MPEG layer 1 audio applications
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 14 X 14 X 2.20 MM, PLASTIC, QFP-44
文件頁(yè)數(shù)： 17/36頁(yè)
文件大?。?/td> 151K
代理商： SAA2520GP
August 1993
17
Philips Semiconductors
Preliminary specification
Stereo filter and codec for MPEG layer 1
audio applications
SAA2520
MPEG Coded Interface (Sub-band I
2
S)
The MPEG coded data is transferred to and from the
SAA2520 using the format shown in Fig.14.
Each period of SBWS contains 64 data bits, 32 of which
are used to convey data. The half-period during which
SBWS is logic 0 is used to transfer the first 16-bits (0 to 15)
of a sub-band slot. The remaining half-period during which
SBWS is logic 1 carries the remaining 16-bits (16 to 31).
Thus one period of SBWS corresponds with one slot of the
sub-band signal.
Bits 0 and 16 are transferred in the bit clock period, one
bit-time after the change in SBWS. Both SBWS and SBDA
change state during the negative edge of SBCL.
In decode mode a byte error flag SBEF is also transferred.
This occurs approximately in the middle of the
corresponding byte (byte 0 = bits 0 to 7,
byte 1 = bits 8 to 15 etc).
Encoding mode
SBCL, SBWS and SBDA are generated by the SAA2520.
However, if the SBDIR signal is logic 1, the output buffers
are not enabled and these signals do not appear on the
pins. This mode is available to permit a change of
operating mode whilst the bus signals are driven from an
external source.
Decoding mode
SBCL, SBWS and SBDA are generated by an external
source.
Table 3 contains a summary of the source signals in the
various modes.
Table 3
Modes and source signals.
Notes
1.
2.
During encoding the SBEF signal is ‘don’t care’.
Incoming data is not decoded. The SAA2520 operates in the encoding mode and the data does not enter the
interface.
Operation is undefined. The SAA2520 is in decoding mode whilst the SBWS, SBCL and SBDA output drivers are
enabled.
3.
source of:
Mode
FDIR
SBDIR
SBWS
SBCL
SBDA
SBEF
SBMCLK
Encode
Encode
Decode
Decode
0
0
1
1
0
1
0
1
INT
EXT
INT
EXT
INT
EXT
INT
EXT
INT
EXT
INT
EXT
----
----
EXT
EXT
INT
INT
INT
INT
note 1
note 2
note 3
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