Supported Dao Functional Blocks; Dao Interface Formats; I 2 S Format; Left-Justified Format - Cirrus Logic CS485 Series User Manual

6.2.2 Supported DAO Functional Blocks

As mentioned in Section
2
output for I S or left-justified PCM data or as a S/PDIF transmitter (XMTA). On the CS48540 and CS48520 it
is only a s S/PDIF transmitter (XMTA). When configured as a S/PDIF transmitter, it encodes digital audio
data according to the Sony/Phillips Digital Interface Format (S/PDIF), also known as IEC60958, or the AES/
EBU interface format.

6.2.3 DAO Interface Formats

The DAO interface has up to 6 stereo data outputs that are fully configurable including support for I
justified, and multichannel (one-line data mode) formats. This section describes some common audio
formats that the CS485xx DAO interface supports. It should be noted that the digital output ports provide up
to 32-bit PCM resolution.
2
6.2.3.1 I 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.
2
details on I S compatible (maximum of 32 bits) serial audio formats.
DAO_LRCLK
DAO_SCLK
DAO_DATA MSB-1 -2 -3 -4 -5
Figure 6-4. I

6.2.3.2 Left-Justified Format

Figure 6-5 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.
DAO_LRCLK
DAO_SCLK
DAO_DATA
MSB -1
Figure 6-5. Left-justified Digital Audio Formats (Rising Edge Valid DAO_SCLK)
DS734UM7
6.1, DAO_DATA3 on CS48560 is unique in that it is designed to serve as either an
Left Channel
+5 +4 +3 +2 +1 LSB
2
S Compatible Serial Audio Formats (Rising Edge Valid DAO_SCLK)
L e ft C h a n n e l
-2 -3 -4 -5 +5 +4 +3 +2 +1 LSB
Copyright 2009 Cirrus Logic, Inc.
Digital Audio Output Port Description
CS485xx Hardware User's Manual
Right Channel
M SB-1 -2 -3 -4 +5 +4 +3 +2 +1 LSB
R ig ht C h a n n el
-1 -2 -3 -4 +5 +4 +3 +2 +1
MSB LSB
2
S, left-
Figure 6-4 provides
6-4