7-3
Copyright 2008 Cirrus Logic, Inc.
DS732UM7
Digital Audio Output Port Description
CS4953xx Hardware Users Manual
Philips
®
Digital Interface Format (S/PDIF), also known as IEC60958, or the AES/EBU interface format. Please see
for a block diagram of the supported functional blocks for the DAO on the CS4953xx
7.1.3 DAO Interface Formats
The DAO interface has 8 stereo data outputs that are fully configurable including support for I
2
S, left-justified, and
multichannel (one-line data mode) formats. This section describes some common audio formats that the CS4953xx
DAO interface supports. It should be noted that the digital output ports provide up to 32-bit PCM resolution.
7.1.3.1 I
2
S Format
In this format, data is presented most-significant bit (MSB) first, one DAO_SCLK delay after the transition of
DAO_LRCLK, and is valid on the rising edge of DAO_SCLK. The left subframe is presented when DAO_LRCLK
is low, and the right subframe is presented when DAO_LRCLK is high.
provides details on I
2
S
compatible (maximum of 32 bits) serial audio formats.
Figure 7-2. I
2
S Compatible Serial Audio Formats (Rising Edge Valid
7.1.3.2 Left-Justified Format
illustrates the left-justified (LJ) format with a rising edge DAO_SCLK. Data is presented most-
significant bit first on the first DAO_SCLK after a DAO_LRCLK transition and is valid on the rising edge of
DAO_SCLK. The left subframe is presented when DAO_LRCLK is high and the right subframe is presented when
DAO_LRCLK is low. This format can also be programmed for data to be valid on the falling edge of DAO_SCLK.
Figure 7-3. Left-justified Digital Audio Formats (Rising Edge Valid DAO_SCLK)
DAO_LRCLK
DAO_SCLK
Left Channel
Right Channel
DAO_DATA
+3 +2 +1 LSB
+5 +4
MSB-1 -2 -3 -4 -5
+3 +2 +1 LSB
+5 +4
MSB-1 -2 -3 -4
DAO_LRCLK
DAO_SCLK
L e ft C h a n n e l
R i g ht C h a n n el
DAO_DATA
+3
+2
+1
LSB
+5
+4
MSB
-1
-2
-3
-4
-5
+3
+2
+1
+5
+4
-1
-2
-3
-4
LSB
MSB
Summary of Contents for CS4953xx
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