CS43122-KS CIRRUS [Cirrus Logic], CS43122-KS Datasheet - Page 19

• Manufacturer Part Number: CS43122-KS
• Description: 122dB, 24-Bit, 192kHz DAC for Digital Audio
• Manufacturer: CIRRUS [Cirrus Logic]

5.
5.1
1) Hold RST high until the power supplies, master
2) Bring RST high.
6.
The control port is used to load all the internal set-
tings of the CS43122. The operation of the control
port may be completely asynchronous to the audio
sample rate. However, to avoid potential interfer-
ence problems, the control port pins should remain
static if no operation is required.
The control port has 2 modes: SPI and “2 wire”,
with the CS43122 operating as a slave device in
both modes. If 2 wire operation is desired, AD0/CS
should be tied to VD or DGND. If the CS43122
ever detects a high to low transition on AD0/CS af-
ter power-up, SPI mode will be selected.
6.1
In SPI mode, CS is the CS43122 chip select signal,
CCLK is the control port bit clock, CDIN is the in-
put data line from the microcontroller, CDOUT is
the data output and the chip address is 0010000.
The data is clocked on the rising edge of CCLK.
Figure 5 shows the operation of the control port in
SPI mode. To write to a register, bring CS low. The
first 7 bits on CDIN form the chip address, and
must be 0010000. The eighth bit is a read/write in-
dicator (R/W). The next 8 bits form the Memory
Address Pointer (MAP), which is set to 01h. The
clock, and left/right clock are stable.
APPLICATIONS
CONTROL PORT INTERFACE
Recommended Power-up Sequence
SPI Mode
next 8 bits are the data which will be placed into the
register designated by the MAP.
6.2
In 2 Wire
Data is clocked into and out of the part by the clock,
SCL, with the clock to data relationship as shown
in Figure 2. There is no CS pin. Pins AD0 and AD1
form the partial chip address and should be tied to
VD or DGND as required. The 7-bit address field,
which is the first byte sent to the CS43122, must be
00100(AD1)(AD0) where (AD1) and (AD0) match
the setting of the AD0 and AD1 pins. The eighth bit
of the address byte is the R/W bit (high for a read,
low for a write). If the operation is a write, the next
byte is the Memory Address Pointer, MAP, which
selects the register to be read or written. The MAP
is then followed by the data to be written. If the op-
eration is a read, then the contents of the register
pointed to by the MAP will be output after the chip
address.
2 Wire Mode
M
ode, SDA is a bi-directional data line.
CS43122
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