BU9408KS2_12 Datasheet, PDF (45/57 Pages) Rohm – 32bit Audio DSP with Built-in 4ch DAC and ASRC

BU9408KS2
Technical Note
5. P-S Conversion 1 and P-S Conversion 2
BU9408KS2 has two built-in parallel-serial conversion circuits (P-S Conversion 1 and P-S Conversion 2). P-S conversion 1
converts the output from the ASRC or DSP (Main/Sub) output to 3-line serial data before sending it from DATAMO, BCKO
and LRCKO (pins 27, 28 and 29). (Refer to &h04 [1:0])
P-S conversion 2 converts the ASRC or DSP (Main/Sub) output or DF1 output into 3-line serial data before transmitting it
from DATASO, BCKO and LRCKO (pins 26, 28 and 29). Moreover, it is also possible to output the synchronous clock for
serial transfer from ERR1_LRC and an ERR2_BCK terminal by an output option (Refer to &h04 [5:4]).
The three output formats are IIS, left-justified and right-justified. 16bit, 20bit and 24bit output can be selected for each
format.
The timing charts for each transfer format are as follows:
IIS Format
LRCKO
BCKO
DATAO
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
MSB
LSB
MSB
LSB
S
S
16bit
20bit
24bit
16bit
20bit
24bit
Left-Justified Format
LRCKO
BCKO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
MSB
LSB
MSB
LSB
DATAO S
S
16bit
20bit
24bit
16bit
20bit
24bit
Right-Justified Format
LRCKO
BCKO
DATAO
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
MSB
LSB
MSB
LSB
S
S
16bit
20bit
24bit
16bit
20bit
24bit
5-1. 3-line Serial Output Format Configuration
Default = 0
Select Address
P-S Conversion 1 &h0D [3:2]
P-S Conversion 2 &h0E [3:2]
Value
0
1
2
IIS format
Left-justified format
Right-justified format
Operation Description
5-2. 3-line Serial Output Data Bit Width Configuration
Default = 0
Select Address
P-S Conversion 1 &h0D [1:0]
P-S Conversion 2 &h0E [1:0]
Value
0
1
2
16 bit
20 bit
24 bit
Operation Description
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2012.03 - Rev.A