
CM6533,CM6533N,CM6533X1,CM6533DH
USB Audio Chip
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35
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60
www.cmedia.com.tw
Rev.1.7
Copyright© C-Media Electronics Inc.
6.8.6
I2C Master Data Register
Address: 0x83 ~ 0x92
Bits R/W
Bit Mnemonic
Description
Default
7-0
R/W
data0~ data15
The data read from or written to the
slave device.
8’b0
(POR)
6.8.7
I2C Master Control and Status Register 0
Address: 0x93
Bits R/W
Bit Mnemonic
Description
Default
7-0
R/W
i2c_ctrl_reg1
Data length of read/write command
8’h1: 1 byte, minimum length
8’h2: 2 bytes
…
8’h
FE: 254 bytes
8’h
FF: 256 bytes, maximum length
0x14
(POR)
6.8.8
I2C Master Control and Status Register 1
Address: 0x94
Bits R/W
Bit Mnemonic
Description
Default
7
R/W
i2c_start
Trigger I2C read/write command
0->1: trigger I2C read/write command.
1->0: I2C interface had completed
current task.
0
: I2C interface is idle and ready for
work.
1 : I2C interface is running.
1’b0
(POR)
6
R/W
i2c_reset
Reset I2C interface
0
: Not reset I2C interface
1
: Reset I2C interface
1’b0
(POR)
5
R/W
map_len
MAP length
0
: 8-bit MAP
1
: 16-bit MAP
1’b0
(POR)
4
R/W
clk_sync
Clock Synchronization
0: off
1: on, when slave pull-down SCLK,
master would pause
1’b
1
(POR)
3
R/W
fast_std
I2C speed mode
0
: Standard mode, 100kHz
1
: Fast mode, 400kHz
1’b0
(POR)
2
R/W
map_only
MAP only write command
0
: Write command.
1
: MAP only write command.
1’b0
(POR)
1
R/W
auto_rd
Auto read command
0
: Read command.
1
: Auto read command.
1’b1
(POR)