CM6308 C-Media Electronics, Inc., CM6308 Datasheet - Page 23

• Manufacturer Part Number: CM6308
• Description: Cm6308 Usb Audio Chip Specification
• Manufacturer: C-Media Electronics, Inc.

Date: 09/04/2007
s p i_ c e n
s p i_ c lk
s p i_ d a ta _ o
s p i_ d a ta _ i
S P I 3 -b y t e W r it e Tr a n s a c tio n
spi_cen
spi_clk
spi_data_o
spi_data_i
SPI 3-byte Write Transaction
SPI 3-byte Read Transaction (R/W bit is embedded in spi_data_o[23:16],
spi_cen
spi_clk
spi_data_o
spi_data_i
M S B
Fig. B. An SPI 3-byte write transaction with codec latching data at spi_clk low state.
Fig. A. An SPI 3-byte write transaction with codec latching data at spi_clk high state.
2 3
Fig. C. An SPI 3-byte read transaction with codec latching data at spi_clk high state.
MSB
23 22 21 20 19 18 17 16 15 14 13 12 11 10
d a ta in a d d re ss o ffs e t B 0 h
MSB
2 2
23 22 21 20 19 18 17 16
R /W b it is s o m e w h e r e b e tw e e n b it2 3 ~ b it1 6 ,
d e p e n d in g o n d iffe re n t c o d e c s
H ig h im p e d a n c e
data in address offset B0h
2 1
data in address offset 9Bh
The bit length of the high
impedance is dependent on
the individual codec.
R/W bit is somewhere between bit23~bit16,
depending on different codecs
High impedance
High impedance
2 0
1 9
1 8
but this bit position is dependent on codecs)
1 7
1 6
LSB
1 5
MSB
15 14 13 12 11 10
d a ta in a d d re s s o ffs e t B 1 h
1 4
data in address offset B1h
This line is not fixed. It can be moved to
the left or right depending on codecs
-
1 3
23/42 -
1 2
11
data will be captured in
address offset B1h, B2h
1 0
9
9
9
Don’t care
Audio and Voice Applications
8
8
Single-Chip USB Solution for
8
codec latch data at spi_clk = 0
c o d e c la tc h d a ta a t s p i_ c lk = 1
CMI8788 latch data at spi_clk=1
7
7
7
data in address offset B2h
d a ta in a d d r e s s o ffs e t B 2 h
6
6
6
5
5
5
4
4
4
3
3
3
2
2
2
1
CM6308
Version:
1
LSB
1
LSB
L S B
0
0
0