Renesas M16C Series User Manual page 124

M30245 Group
In the case of the USB audio class, the following stream is output.
Audio stream (PCM) from the PC to the M30245 USB FIFO
For 16-bit data
Fifth byte
f7
MSB
Left Low (LL)
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USB FIFO data setup
M30245 FIFO address
For 16-bit data
OPERATION
First Word Write
Second Word Write
Third Word Write
Fourth Word Write
Just as 16 bits, the data width is expanded to output data for 24 bits and 32 bits .
For 24-bit data
OPERATION
First Word Write
Second Word Write
Third Word Write
Fourth Word Write
For 32-bit data
OPERATION
First Word Write
Second Word Write
Third Word Write
Fourth Word Write
Figure 2.6.4. Example of Audio stream (PCM) from the PC to the M30245 USB FIFO
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Fourth byte
f1 f0 e7 e1 e0
LSB
MSB LSB
Right High (RH)
RH RL LH LL RH RL LH LL RH RL LH LL
FIFO data
Second byte LH
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0
Fourth byte RH
1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Sixth byte LH
2 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Eighth byte RH
3 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Tenth byte LH
4
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Twelfth byte RH
5
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
MSB
LSB
MSB LSB
b0 b7 b0 b7 b0
Left Buffer
Byte 1 Byte 0
First byte Second byte
Third byte
Sixth byte
Fifth byte
Seventh byte
LSB
b0 b7 b0 b7 b0
Left Buffer
Byte 2
Byte 1
First byte (LL)
Second byte (LM)
Third byte (LH)
Seventh byte Eighth byte
LSB
b0
b7 b0 b7 b0
Left Buffer
Byte 3 Byte 2
First byte (LL)
Second byte (LML)
Third byte (LMH) Fourth byte (LH)
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Third byte
d7 d1 d0
c7
MSB LSB MSB
Right Low (RL)
LSB
First byte LL
Third byte RL
Fifth byte LL
Seventh byte RL
Ninth byte LL
Eleventh byte RL
LSB
MSB
b7
b7 b0
Right Buffer
Byte 1 Byte 0
Fourth byte
LL: b0 to b7 RL: b0 to b7
Eighth byte
LH: b8 to b15 RH: b8 to b15
MSB LSB
b7 b0 b7 b0
b7 b0
Right Buffer
Byte 2
Byte 0 Byte 1
Fourth byte (RL)
Fifth byte (LM)
LL: b0 to b7
LM: b8 to b15
LH: b16 to b23
MSB LSB
b7 b0 b7 b0
b7 b0
Byte 1 Byte 0 Byte 3
Fifth byte (RL)
2. Serial sound interface
First byte
Second byte
b7
c1 c0
MSB
LSB
Left Low (LL)
Left High (LH)
LSB first transmit/receive
MSB
b7
Byte 0
Sixth byte (LH)
RL: b0 to b7
RM: b8 to b15
RH: b16 to b23
b7 b0 b7 b0
Right Buffer
Byte 2 Byte 1 Byte 0
Sixth byte (RML)
Seventh byte (RMH) Eighth byte (RH)
LL: b0 to b7 RL: b0 to b7
LML: b8 to b15 RML: b8 to b15
LMH: b16 to b23 RHH: b16 to b23
LH: b24 to b31 RH: b24 to b31
b1 b0
LSB
MSB
b7