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參數(shù)資料
| 型號： | CXD2548R |
| 廠商： | Sony Corporation |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | CD Digital Signal Processor with Built-in Digital Servo and DAC |
| 中文描述： | CD數(shù)字信號處理器，具有內(nèi)置數(shù)字伺服和DAC |
| 文件頁數(shù)： | 50/113頁 |
| 文件大小： | 1286K |
| 代理商： | CXD2548R |
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CXD2548R
2-2. Subcode Interface
There are two methods for reading out a subcode externally.
The 8-bit subcodes P to W can be read out from SBSO by inputting EXCK to the CXD2584R.
Sub Q can be read out after checking CRC of the 80 bits in the subcode frame.
Sub Q can be read out from the SQSO pin by inputting 80 clock pulses to the SQCK pin when SCOR comes
correctly and CRCF is high.
P to W Subcode Readout
Data can be read out by inputting EXCK immediately after WFCK falls. (See Timing Chart 2-16.)
80-bit Sub Q Readout
Fig. 2-2 shows the peripheral block of the 80-bit Sub Q register.
First, Sub Q, regenerated at one bit per frame, is input to the 80-bit serial/parallel register and the CRC check
circuit.
96-bit Sub Q is input, and if the CRC is OK, it is output to SQSO with CRCF = 1. In addition, 80 bits are
loaded into the parallel/serial register.
When SQSO goes high 400μs (monostable multivibrator time constant) or more after subcode readout, the
CPU determines that new data (which passed the CRC check) has been loaded.
When the 80-bit data is loaded, the order of the MSB and LSB is inverted within each byte. As a result,
although the sequence of the bytes is the same, the bits within the bytes are now ordered LSB first.
Once the 80-bit data load is confirmed, SQCK is input so that the data can be read.
The SQCK input is detected, and the retriggerable monostable multivibrator is reset while the input is low.
The retriggerable monostable multivibrator has a time constant from 270 to 400μs. When the duration when
SQCK is high is less than this time constant, the monostable multivibrator is kept reset; during this interval,
the serial/parallel register is not loaded into the parallel/serial register.
While the monostable multivibrator is being reset, data cannot be loaded in the 80-bit parallel/serial register.
In other words, while reading out with a clock cycle shorter than this time constant, the register will not be
rewritten by CRCOK and others.
See Timing Chart 2-17.
The high and low intervals for SQCK should be between 750ns and 120μs.
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| CXD2552 | 1 BIT D/A CONVERTER |
| CXD2552Q | 1 BIT D/A CONVERTER |
| CXD2597Q | CD Digital Signal Processor with Built-in Digital Servo and DAC |
| CXD2720Q-2 | CAP 10UF 50V 20% TANT SMD-7343-43 TR-13 GOLD |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CXD2550P | 制造商:SONY 制造商全稱:Sony Corporation 功能描述:Digital Filter for CD |
| CXD2551M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Filter |
| CXD2551M/P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Filter |
| CXD2551P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Filter |
| CXD2552 | 制造商:SONY 制造商全稱:Sony Corporation 功能描述:1 BIT D/A CONVERTER |
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