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參數資料
| 型號： | SAA2500H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | MPEG Audio Source Decoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT-307-2, QFP-44 |
| 文件頁數： | 38/47頁 |
| 文件大小： | 199K |
| 代理商： | SAA2500H |
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September 1994
38
Philips Semiconductors
Preliminary specification
MPEG Audio Source Decoder
SAA2500
Table 37
Status bytes DST1 and DST0; note 1.
Note
1.
No status byte transfers are needed; the load of the host (microcontroller) can thus be reduced.
L3DATA
TRANSFER
SOURCE
L3MODE
EXPLANATION
01100011
polled
host
SAA2500
0
1
write ‘read status’ operational address
test L3DATA; repeat this step until L3DATA = 1
O
PTIONS TO INCREASE THE TIMING ACCURACY OF THE
APU
COEFFICIENT WRITING
The SAA2500 offers three enhancements to increase the
timing accuracy with which APU coefficients can be
updated by the application:
1.
Status polling is not required when APU coefficients
are written. L3 status flag L3RDY, when read anyhow,
will always be HIGH, indicating that the next APU
coefficient transfer may be done. The transfer speed is
only limited by the maximum allowed frequency of
L3CLK. As a result, also no ‘write item data’
operational address is needed any more before writing
each APU coefficient index.
2.
Normally, no more bytes may be written to a writeable
data item than the length of that specific item. An
exception is formed by the APU coefficients. They may
be written continuously with a coefficient wrap. After
the writing of all 4 coefficients, the writing can be
continued at the first APU coefficient without having to
write a new control byte.
3.
The data item transfer protocol, described in
Section “Data items”, although transparent, allows
only for the reading or writing of data items from their
first data byte onwards. This approach can lead to
situations where e.g. 54 Ancillary Data item bytes
must all be read (which takes at least
54
×
200
μ
s = 10.8 ms, due to the interface speed
limitations: see Section “Data items”) before the next
data item can be transferred. The SAA2500 enables
the writing of APU coefficients without having to wait
for the current item transfer to finish. In order to do so,
a running transfer can be interrupted by an APU
coefficient write transfer, and then be resumed with the
‘continue current transfer’ control byte.
An item transfer may be interrupted at any time to write
APU coefficients. After the ‘continue previous transfer’
control byte, a operational address must always follow,
indicating the type of L3 transfer that will follow. An
APU coefficient write transfer itself cannot be
interrupted.
The 3 mentioned options are all illustrated in Table 38,
where a data item transfer is interrupted between the
reading of the n
th
and (n + 1)
th
data item byte.
相關PDF資料 |
PDF描述 |
|---|---|
| SAA2501 | Digital Audio Broadcast DAB decoder |
| SAA2501H | Digital Audio Broadcast DAB decoder |
| SAA2502 | ISO/MPEG Audio Source Decoder |
| SAA2502H | ISO/MPEG Audio Source Decoder |
| SAA2503 | MPEG2 audio decoder(MPEG2 音頻譯碼器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SAA2500HB-S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video Processing/ENDEC for MPEG |
| SAA2501 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Audio Broadcast DAB decoder |
| SAA2501H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Audio Broadcast DAB decoder |
| SAA2501HB-S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Audio Decoder & Support |
| SAA2502 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ISO/MPEG Audio Source Decoder |
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