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| 型號： | PCM9211PTR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | DATACOM, TOKEN RING TRANSCEIVER, PQFP48 |
| 封裝： | GREEN, PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 54/121頁 |
| 文件大小： | 1219K |
| 代理商： | PCM9211PTR |
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RXINx
Built-in PLL
Status
XTI Status
ERROR
SCKO, BCK,
LRCK
CLKST
Non-Biphase
Biphase
Non- Biphase
Unlock
Lock
Unlock
Normal Operation
XTI (ADC) Source
DIR Source
XTI (ADC) Source
ADC Source
MUTE
DIR Source
ADC Source
DOUT
MUTE
t
CLKST2
t
CLKST1
t
XTIWT
SBAS495 – JUNE 2010
www.ti.com
DIR: Auto Source Selector for Main Output and AUX Output
The AUTO source selector is an automatic system that selects the DIR or ADC output based on specific DIR
conditions set by Register 26h. The AUTO source selector is integrated in both the Main Port and the AUX
output separately.
The typical behavior for the AUTO source selector is shown in Figure 30. This example is the default register
setting for Register 26h. In this case, only Register 26h/AUNLOCK is selected.
Figure 30. Typical Behavior for AUTO Source Selector
When the DIR is unlocked, the ADC output is automatically routed to the Main Output Port.
Polarity of the CLKST signal is configured by Register 22h/CLKSTP. The default is active low, which means that
clock source either changes from DIR to ADC, or from ADC to DIR.
If the DIR is locked, then the DIR output is routed to the Main Output Port automatically after tCLKST1. During that
period, the output port is muted. tCLKST1 can be configured using Register 23h/ERRWT[1:0]. tCLKST2 is 50 ms,
providing that an XTI clock of 24.576 MHz is applied.
If the DIR loses its lock a subsequent time, the ADC output is routed to the Main Output Port automatically after
tXTIWT. Once again, the output port is muted during this time. tXTIWT can be configured using Register
23h/XTIWT[1:0].
The auto source selector can be triggered by the following changes in the DIR (Register 26h is used to select
which variable to use as the trigger):
DIR error (discussed earlier in DIR: Errors and Interrupts; configured by Register 25h)
Out-of-range sampling frequency
Non-PCM data
When the Validity flag in the S/PDIF stream is '1'
When the PLL is unlocked (default)
38
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): PCM9211
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