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| 型号： | TC9444F |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP60 |
| 封装： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-60 |
| 文件页数： | 27/28页 |
| 文件大小： | 378K |
| 代理商： | TC9444F |
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TC9444F
2002-01-11
8
2.3
Zero Data Detection Function Common to L/R
The TC9444F incorporates a function to output a zero detection flag from the DZ pin when input
data contain a string of digital zeros. This is used to forcibly mute the analog output.
Table 2.4 shows the time that elapses until data are detected as zero data. If digital zeros continue
to be output during this period, a zero detection flag is set.
Moreover, setting the DZINH bit in the microcontroller interface mode command to “H” halts zero
detection, fixing the DZ pin to “L” and disabling the zero detection function (see the microcontroller
interface section below).
Table 2.4
Digital Zero Data Detection Time
fs
32 kHz
44.1 kHz
48 kHz
Detection Time
1024 ms
743 ms
683 ms
A reset sets the DZ signal to “H”.
2.4
Data Output Formats
Table 2.5 and Figure 2.2 show the data output formats. Microcontroller interface bits OBIT and
OBIT2 select the format.
In master mode, the BCKI clock rate varies through the range shown in Table 2.2. Note, however,
that BCKO is fixed to 64 fs.
In slave mode, the BCKI input clock is directly output as the data output bit clock (BCKO) through
the IC internal buffer (see section 2.2).
Table 2.5
Data Output Formats
SYNM2
SYNM1
IBIT2
IBIT1
Format
BCKI
0
MSB first, Right-Justified mode, 16-bit
data
64 fs
0
1
MSB first, Right-Justified mode, 20-bit
data
64 fs
0
1
0
MSB first, Right-Justified mode, 24-bit
data
64 fs
0
1
Master
mode
IIS-compatible, 24 bits
64 fs
0
1
0
MSB first, Right-Justified mode, 16-bit
data
32 fs (
= BCKI)
0
1
0
1
Prohibited
32 fs (
= BCKI)
0
1
0
Prohibited
32 fs (
= BCKI)
0
1
IIS-compatible, 16 bits
32 fs (
= BCKI)
1
0
MSB first, Right-Justified mode, 16-bit
data
48 fs (
= BCKI)
1
0
1
MSB first, Right-Justified mode, 20-bit
data
48 fs (
= BCKI)
1
0
1
0
MSB first, Right-Justified mode, 24-bit
data
48 fs (
= BCKI)
1
0
1
IIS-compatible, 24 bits
48 fs (
= BCKI)
1
0
MSB first, Right-Justified mode, 16-bit
data
64 fs (
= BCKI)
1
0
1
MSB first, Right-Justified mode, 20-bit
data
64 fs (
= BCKI)
1
0
MSB first, Right-Justified mode, 24-bit
data
64 fs (
= BCKI)
1
Slave
mode
IIS-compatible, 24 bits
64 fs (
= BCKI)
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| TC9446F | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Audio Digital Processor for Decode of Dolby Digital (AC-3), MPEG2 Audio |
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