Datasheet

2−4
A 16-bit field contained in the 32-bit word located at I
2
C subaddress 0xF9 configures both the input and output serial
audio ports. Figure 2−4 illustrates the format of this 16-bit field. The data is shown in the transmitted I
2
C protocol
format, and thus, in addition to the data, the start bit S, the slave address, the subaddress, and the acknowledges
required by every byte are also shown.
0xF9
DWFMT (Data Word Format)
Ack
IOMAck
OW[2:0]
15
IW[2:0]
0
AB
14 13 11 10 8
7
DWFMT
815
AckxxxxxxxxAckSubaddrAckSlave AddrS
2431
OM[3:0]IM[3:0]
743 0
xxxxxxxxAck
1623
Output
Port
Format
Input
Port
Format
Output Port
TDM Alignment
Input Port
Word
Size
Output Port
Word
Size
Figure 2−4. SAP Configuration Subaddress Fields
Commands to reconfigure the SAP cannot be issued as stand-alone commands, but must accompany mute and
unmute commands. The reason for this is that an SAP configuration change while a volume, bass, or treble update
is taking place can cause the update not to be completed properly. Figure 2−5 shows the recommended procedure
for issuing SAP configuration update commands.
After a reset, ensure that 0xF9 is written before volume, treble, or bass.