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参数资料
| 型号： | PCM9211PT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, TOKEN RING TRANSCEIVER, PQFP48 |
| 封装： | GREEN, PLASTIC, LQFP-48 |
| 文件页数： | 58/121页 |
| 文件大小： | 1219K |
| 代理商： | PCM9211PT |
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www.ti.com
SBAS495 – JUNE 2010
Data Mute Function
The PCM9211 has the ability to mute the audio data on its DIT output. This option is set using Register
62h/TXDMUT. During a mute state (TXDMUT = '1'), the biphase stream continues to flow, but all audio data are
zeroed.
The channel status data and validity flag are not zeroed. Mute is done at the LRCK edge for both L-ch and R-ch
data at the same time.
Channel Status Data
The DIT has the ability to transmit channel status (CS) data for the first 48 bits of the 128-bit stream. These 48
bits cover the standards for both S/PDIF and AES/EBU. These bits are set in Registers TXCS0 through TXCS47.
These values are used on both the Left and Right channels of the output stream.
Upon reset, these registers are all '0' by default.
User Data
This DIT does not have the ability to transmit custom user data (known as "U Bits" in the stream).
Validity Flag
Setting the valid flag is possible in the DIT by using Register 62h/TXVFLG. The same value is used for both left
and right channels.
Standalone Operation
Standalone operation for the DIT module is provided by supplying external clocks and data (SCK, BCK, LRCK,
and Data). In standalone mode, the audio and clock data must be brought into the device through MPIO_C. To
enable standalone mode, set Register 6Fh/MPCSEL[2:0] to '101'. This configuration then bypasses the standard
DIT connections through the device and connects them directly to MPIO_C.
Channel Status and Validity flags continue to be sourced from the same registers as they would during normal
DIT operation.
Copyright 2010, Texas Instruments Incorporated
41
Product Folder Link(s): PCM9211
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