參數(shù)資料
型號: HD49235FS
廠商: Hitachi,Ltd.
元件分類: 數(shù)字信號處理
英文描述: Digital Signal Processor for CD
中文描述: 數(shù)字信號處理器的CD
文件頁數(shù): 20/41頁
文件大小: 192K
代理商: HD49235FS
HD49235FS
Rev.2, Aug. 1995, page 20 of 41
QOK:
The output at this pin indicates whether or not the Q subcode is correct.
One block of Q subcode data consists of 98 bits, of which 16 bits are parity bits that indicate whether
the data read from the disc was correct or in error. An on-chip cyclic redundancy check circuit decides
whether the 98-bit data string is correct or not, and outputs the result at the QOK pin. A high-level
output indicates OK. Figures 7 and 8 show the output timing.
In modes using the Q code buffer register, when the microprocessor sets the CRCQ bit to 1, QOK is
inserted in QDATA at the rise of S1.
See the note in the timing chart shown in figure 7.
EMP:
This output pin indicates the presence or absence of pre-emphasis. The pre-emphasis signal is
detected from the Q subcode and output at the EMP pin. High output indicates audio with pre-emphasis.
Low output indicates audio without
pre-emphasis.
SUBOUT:
This pin outputs codes R to W for use in display of graphics.
CFCKP:
This pin outputs a subcode frame synchronization signal.
S1
QOK
CKEXT
QDATA
1
2
3
4
5
80
1
2
3
Note:
Q4
Q3
Q2
Q1
Q8
Q77
Q4
Q3
Q2
*
*
*
Undefined when CRCQ = 0; QOK when CRCQ = 1 (high when CRC result is OK)
Figure 7 Timing When QDSEL is Low (Q Code Buffer Mode)
CKEXT
CFCKP
QDATA
S1
QOK
7.35 kHz
Q96
S0
S1
Q1
CRC result data: high when OK
Figure 8 Timing When QDSEL is High(Q Code Internal Synchronization Mode,
Standard Speed Playback)
相關(guān)PDF資料
PDF描述
HD49304ANT 8-Bit 3ch Video D/A Converter(8位視頻D/A轉(zhuǎn)換器)
HD49307 Three-Channel 8-bit D/A Converter
HD49315AF CMOS 10-Bit A/D Converter(CMOS 10位A/D轉(zhuǎn)換器)
HD49319F CMOS 9-Bit A/D Converter(CMOS 9位A/D轉(zhuǎn)換器)
HD49323AF CDS/AGC & 10-bit A/D Converter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD49304ANT 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Digital-to-Analog Converter
HD49306AF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Converter IC
HD49307 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Three-Channel 8-bit D/A Converter
HD49307FB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Converter IC
HD49315AF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter, 10-Bit