Datasheet

2−3
2.1 Input and Output Serial Audio Ports (SAPs)
The TAS3103 accepts data in various serial data formats including left/right justified and I
2
S, 16 through 32 bits,
discrete, or TDM. Sample rates from 8 kHz through 96 kHz are supported. Each TAS3103 has four input serial ports
and three output serial ports, labeled SDIN[4:1] and SDOUT[3:1] respectively. All ports accommodate stereo data
formats, and SDIN1 and SDOUT1 also accommodate time-division multiplex (TDM) data formats. The formats are
selectable via I
2
C commands. All input channels are assigned the same format and all output channels are assigned
the same format; and the two formats need not be the same. The TAS3103 can accommodate system architectures
that require data format conversions without the need for additional glue logic. If a TDM format is selected for the input
port, only SDIN1 is active; the other three input channels cannot be used. If a TDM format is selected for the output
port, only SDOUT1 is active; the other two channels cannot be used.
2.1.1 SAP Configuration Options
The TAS3103 serial interface data format options for discrete (stereo) data are detailed in Figure 2−2.
Left / Right
Justified
L
RCLK
SCLK
MSB−1
LSB
LSB
Left Justified
LSB
LSB+1
LSB+1
Right Justified
LSB
LSB+1
Bit 31
Bit 0
Bit 31 Bit 0
Bit 31
SCLK
LSB
Bit 0 Bit 31Bit 31
MSB
Bit 0
SCLK
Bit 31 Bit 31
Bit 0 Bit 0
Bit 31
Bit 31
Bit 0
MSB
I
2
S
I
2
S
MSB−1 MSB
MSB−1 MSB MSB−1 MSB
MSB−1 MSB
LSB+1LSB LSB+1 MSB−1 MSB MSB−1 MSB
Figure 2−2. Discrete Serial Data Formats
When the TAS3103 is transmitting serial data, it uses the negative edge of SCLK to output a new data bit. The
TAS3103 samples incoming serial data on the rising edge of SCLK.
The TDM modes on the TAS3103 only provide left justified and I
2
S formats, and each word in the TDM data stream
adheres to the bit placement shown in Figure 2−2. Figure 2−3 illustrates the output data stream for a 4-channel TDM
mode. Two cases are illustrated; an I
2
S data format case (SAP output mode 1010) and a left-justified data format case
(SAP output mode 0111).
MSB−1 LSB LSB LSB LSB MSB
Left
LRCLK
Data
LRCLK
Data
Justified
MSB MSB−1MSB MSB−1MSB MSB−1MSB
LSBLSBLSBLSBMSB−1MSB
I
2
S
Left Channel 1 Left Channel 2 Right Channel 1 Right Channel 2
Left Channel 1 Left Channel 2 Right Channel 1 Right Channel 2
MSB−1MSB MSB−1MSB MSB−1MSB
Figure 2−3. Four-Channel TDM Serial Data Formats