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| 型號： | SAF7849HL |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 存儲器 |
| 英文描述： | One chip CD audio device with integrated MP3-WMA decoder |
| 封裝： | SAF7843HL/M295<SOT486-1 (LQFP144)|<<http://www.nxp.com/packages/SOT486-1.html<1<Always Pb-free,;SAF7849HL/M245<SOT486-1 (LQFP144)|<<http://www.nxp.com/packages/SOT486-1.h |
| 文件頁數(shù)： | 49/93頁 |
| 文件大?。?/td> | 396K |
| 代理商： | SAF7849HL |
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SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
49 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
Tacho trip frequency:
It is possible for the software to be notified with an interrupt when
reaching a specific speed during spin-up or spin-down. This is done by programming the
desired frequency trip point in register TACHO2. When the tacho frequency goes above or
below this trip point, an interrupt gets generated (bit 3 of register InterruptStatus2). Bit 1
(TACHOINTERRUPTSELECT) of register TACHO3 can be set to enable an interrupt to be
generated when the frequency goes above or below the trip point.
6.6 Parallel Digital Servo IC (PDSIC)
The digital servo block design on the SAF784x has evolved from the design used on the
SAA7824 IC, and is referred to as the PDSIC. ‘Parallel’, refers to the microprocessor
interface of the servo block which is now a high speed parallel interface. Previously, it was
a serial interface used on the SAA7824, 3 or 4-wire, I
2
C-bus. The PDSIC features are
listed below:
Programmable ADC for CD-RW playback compatibility
Diode signal processing
Signal conditioning
Focus and radial control system
Access control
Sledge control
Shock detector
Defect detector
Off-track counting and detection
Automatic closed-loop gain control available for focus and radial loops
Hi-level features
Flexible servo
6.6.1
PDSIC registers and servo RAM control
The servo block is controlled by two parts of the design: the servo control registers which
are used to control the writing of commands and parameters to the servo, and the servo
RAM. The servo RAM has two roles: storage of the servo parameters, and capture of
commands and parameters during the command process.
All of the servo write commands consist of a command byte followed by a number of
parameter bytes (between one and seven), all of which have to be loaded into the PDSIC
using a serial communication interface.
The command byte is the first to be loaded and can be considered as two nibbles. The
upper (most significant) nibble represents the command itself whilst the lower (least
significant) nibble tells the PDSIC how many parameter bytes to expect. The command
byte gets placed into memory location 0x31 (called oldcom).
Subsequently, parameter bytes get loaded sequentially and these get placed into a stack
space that has been reserved within the memory (locations 0x30 down to 0x2B). With
each parameter byte that is loaded, the value in oldcom is decremented so that the byte
count decreases to zero, and the PDSIC knows it has a complete servo command (a
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(fēng)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(fēng)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 |
| SAF82525 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Data Communications ICs |
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