- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372115 > SAA7374GP (NXP SEMICONDUCTORS) Low voltage digital servo processor and Compact Disc decoder CD7LV PDF資料下載
參數(shù)資料
| 型號： | SAA7374GP |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Low voltage digital servo processor and Compact Disc decoder CD7LV |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 14 X 14 MM, 2.70 MM HEIGHT, PLASTIC, MS-022, SOT-393-1, QFP-64 |
| 文件頁數(shù)： | 28/60頁 |
| 文件大?。?/td> | 324K |
| 代理商： | SAA7374GP |
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頁當(dāng)前第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
1998 Feb 26
28
Philips Semiconductors
Product specification
Low voltage digital servo processor and
Compact Disc decoder (CD7LV)
SAA7374
7.14.6
D
EFECT DETECTION
Fig.20 Block diagram of defect detector.
handbook, full pagewidth
DECIMATION
FILTER
FAST
FILTER
DEFECT
GENERATION
PROGRAMMABLE
HOLD-OFF
SLOW
FILTER
defect
output
sat1
sat2
+
MBG421
A defect detection circuit is incorporated into the
SAA7374. If a defect is detected, the radial and focus error
signals may be zeroed, resulting in better playability. The
defect detector can be switched off, applied only to focus
control or applied to both focus and radial controls under
software control (part of foc_parm1).
The defect detector (see Fig.20) has programmable set
points selectable by the parameter defect_parm.
7.14.7
O
FF
-
TRACK DETECTION
During active radial tracking, off-track detection has been
realised by continuously monitoring the off-track counter
value. The off-track flag becomes valid whenever the
off-track counter value is not equal to zero. Depending on
the type of extended S-curve, the off-track counter is reset
after 0.75 extend or at the original track in the 2.25 track
extend mode.
7.14.8
HIGH LEVEL FEATURES
7.14.8.1
Interrupt mechanism and STATUS pin
The STATUS pin is an output which is active LOW, its
output is selected by register 7 to be either the status bit
(active LOW) selected by register 2 (only available in
4-wire bus mode) or the interrupt signal generated by the
servo part.
8 signals from the interrupt status register are selectable
from the servo part via the interrupt_mask parameter. The
interrupt is reset by sending the read high-level status
command. The 8 signals are listed below.
1.
Focus lost: drop out of longer than 3 ms.
2.
Subcode ready.
3.
subcode absolute seconds changed.
4.
Subcode discontinuity detected: new subcode time
before previous subcode time, or more than 10 frames
later than previous subcode time.
5.
Radial error: during radial on-track, no new subcode
frame occurs within time defined by playwatchtime
parameter. During radial jump, less than 4 tracks have
been crossed during time defined by jumpwatchtime
parameter.
Autosequencer state change.
Autosequencer error.
Subcode interface blocked: the internal decoder
interface is being used.
6.
7.
8.
It should be noted that if the STATUS pin output is selected
via register 2 and either the microcontroller writes a
different value to register 2 or the decoder interface is
enabled then the STATUS output will change.
7.14.8.2
Decoder interface
The decoder interface allows registers 0 to F to be
programmed and subcode Q-channel data to be read via
servo commands. The interface is enabled/disabled by the
preset latch command (and the xtra_presetparameter)
7.14.8.3
Automatic error handling
Three watchdogs are present;
1.
Focus: detects focus drop out of longer than 3 ms, sets
focus lost interrupt, switches off radial and sledge
servos, disables drive to disc motor.
2.
Radial play: started when radial servo is on-track
mode and a first subcode frame is found. Detects
when maximum time between two subcode frames
exceeds time set by playwatchtime parameter; then
sets radial error interrupt, switches radial and sledge
servos off, puts disc motor in jump mode.
3.
Radial jump: active when radial servo in long jump or
short jump modes. Detects when the off-track counter
value decreases by less than 4 tracks between two
readings (time interval set by jumpwatchtime
parameter); then sets radial jump error, switches radial
and sledge servos off to cancel jump.
The focus watchdog is always active, the radial watchdogs
are selectable via the radcontrolparameter.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA7376 | Digital servo processor and Compact Disc decoder CD7 |
| SAA7377GP | Force/Pressure transducer; Compensated; Pressure Range: 0 to 25 psi |
| SAA7377 | Digital servo processor and Compact Disc decoder CD7 |
| SAA7378GP | Single Chip Digital Servo Processor and Compact Disc Decoder |
| SAA7380 | Error correction and host interface IC for CD-ROM ELM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7376 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7 |
| SAA7377 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7 |
| SAA7377GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7 |
| SAA7377GP/M1,518 | 功能描述:IC DIGITAL PROCESSOR/CD7 64QFP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機(jī)，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| SAA7378GP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single Chip Digital Servo Processor and Compact Disc Decoder |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。