- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379343 > SAF7847HL (NXP SEMICONDUCTORS) One chip CD audio device with integrated MP3-WMA decoder PDF資料下載
參數(shù)資料
| 型號： | SAF7847HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | One chip CD audio device with integrated MP3-WMA decoder |
| 中文描述： | COLOR SIGNAL DECODER, PQFP144 |
| 封裝： | 20 X 20 MM, 1.40 MM HEIGHT, SOT486-1, MS-026, PLASTIC, QFP-144 |
| 文件頁數(shù)： | 38/93頁 |
| 文件大?。?/td> | 396K |
| 代理商： | SAF7847HL |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁當前第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁
SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
38 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
Master (Flow Control) mode: selected when using a gated bit clock (bclk) at the I
2
S
interface, see
Section 6.5.9.9 on page 43
for more information. When a frame is
available in the FIFO, it is output via the I
2
S interface. When FIFO underflow is
imminent, the decoder gates the output interface by disabling bclk.
Slave (audio) mode: the bclk is continuously clocked in this mode. The application is
responsible for matching the input rate (EFM bit rate from the disc) to the selected
output rate (I
2
S bclk speed), keeping FIFO filling between 118 and 128 frames. This is
done by regulating the disc speed. See
Section 6.5.10
for more details.
The FIFO only stores data, not subcode. This means that the data will be delayed as it
comes from the demodulator, but the subcode is sent directly over the I
2
S interface. The
difference in delay between subcode and data is always fixed. It is absolutely fixed in
Master mode, but can have small local variations in Slave mode.
6.5.7.3
Safe and unsafe correction modes
The CD CIRC decoding standard uses a Reed-Solomon (RS) error correction scheme.
Reed-Solomon error correction has a very small chance of miscorrection, where a
corrupted code word is modified into a valid but wrong code word. This results in the code
word, after correction, being a valid existing RS code word but not the word that used to
be present at this location before corruption. The chance of miscorrections increases
exponentially for every extra byte that needs to be corrected in a code word, and is
greatest when performing the maximum number of corrections possible with a certain RS
correction scheme.
Miscorrections should be avoided, since they result in corrupted data being sent to the
back end, without their corresponding invalid flag being set. This is a problem for CD
audio, as unflagged wrong data will not get interpolated, which can result in audible clicks.
Both C1 and C2 correction logic can be programmed to operate in a ‘unsafe’ or ‘safe’
mode via register ErcoControl. In unsafe mode, the maximum number of corrections will
always be done (if required). In Safe mode, corrections will not be done when they are
considered too ‘unsafe’, which means there is a realistic chance that they could lead to a
miscorrection.
For C1, unsafe mode allows two bytes per code word to be corrected, Safe mode allows
only one byte per code word. For C2, both modes will allow up to four erasures per code
word to be corrected. When there are more than four erasures, and therefore ERCO
switches back to error correction, unsafe mode allows two bytes to be corrected, Safe
mode allows only one.
Remark:
From experiments and theory it is advised to use C1 unsafe and C2 safe for CD
audio as a good trade-off between safety and maximum error correction capability. For
CD-ROM, use C1 unsafe and C2 unsafe if there is at least a C3 error correction and if the
flywheels in the CD-ROM block decoder are robust against possible invalid, but not
flagged, headers.
6.5.8
Error corrector statistics
6.5.8.1
CFLG
The error corrector outputs status information on pin CFLG. The format of this information
is serial and similar to the Meas1 signal on pin CL1.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAF7849HL | One chip CD audio device with integrated MP3-WMA decoder |
| SB-015 | GMR Digital Sensor Evaluation Kit |
| SB10100F | ISOLATION SCHOTTKY BARRIER RECTIFIERS |
| SB1040F | ISOLATION SCHOTTKY BARRIER RECTIFIERS |
| SB1080F | ISOLATION SCHOTTKY BARRIER RECTIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAF7847HL/M201,557 | 功能描述:音頻 DSP 1 chip CD Audio Dev w/Integrated decoder RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| SAF7849HL/M245,557 | 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| SAF7849HL/M295,557 | 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| SAF7860HL/M2,557 | 制造商:NXP Semiconductors 功能描述:DSP |
| SAF82520PVB2 | 制造商:SIEMENS 功能描述:New |
發(fā)布緊急采購，3分鐘左右您將得到回復。