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WM8281ECS/R 数据表(PDF) 143 Page - Cirrus Logic

部件名 WM8281ECS/R
功能描述  Low Power Audio System with Ambient Noise Cancellation and Echo Cancellation
PDF  392 Pages
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制造商  CIRRUS [Cirrus Logic]
网页  http://www.cirrus.com
标志 CIRRUS - Cirrus Logic

WM8281ECS/R 数据表(HTML) 143 Page - Cirrus Logic

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WM8281
Rev 4.0
143
n
n-1
n-2
3
2
1
n
n-1
n-2
3
2
1
LEFT CHANNEL
RIGHT CHANNEL
MSB
LSB
Input Word Length (WL)
1/fs
LRCLK
BCLK
RXDAT/
TXDAT
1 BCLK
In Slave mode, the falling edge can occur anywhere in this area
1 BCLK
Figure 45 DSP Mode A Data Format
n
n-1
n-2
3
2
1
n
n-1
n-2
3
2
1
LEFT CHANNEL
RIGHT CHANNEL
MSB
LSB
Input Word Length (WL)
1/fs
LRCLK
BCLK
RXDAT/
TXDAT
1 BCLK
1 BCLK
In Slave mode, the falling edge can occur anywhere in this area
Figure 46 DSP Mode B Data Format
PCM operation is supported in DSP interface mode. WM8281 data that is output on the Left Channel
will be read as mono PCM data by the receiving equipment. Mono PCM data received by the
WM8281 will be treated as Left Channel data. This data may be routed to the Left/Right playback
paths
using the control fields described in the “Digital Core” section.
In I2S mode, the MSB is available on the second rising edge of BCLK following a LRCLK transition.
The other bits up to the LSB are then transmitted in order. Depending on word length, BCLK
frequency and sample rate, there may be unused BCLK cycles between the LSB of one sample and
the MSB of the next.
n
n-1
n-2
3
2
1
n
n-1
n-2
3
2
1
LEFT CHANNEL
RIGHT CHANNEL
MSB
LSB
Input Word Length (WL)
1/fs
LRCLK
BCLK
RXDAT/
TXDAT
1 BCLK
1 BCLK
Figure 47 I2S Data Format (assuming n-bit word length)
In Left Justified mode, the MSB is available on the first rising edge of BCLK following a LRCLK
transition. The other bits up to the LSB are then transmitted in order. Depending on word length,
BCLK frequency and sample rate, there may be unused BCLK cycles before each LRCLK transition.



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