參數(shù)資料
型號(hào)： PCM4108CPAPT
廠商： Texas Instruments, Inc.
英文描述： HIGH-PERFORMANCE, 24-BIT, 216kHz SAMPLING, EIGHT-CHANNEL AUDIO DIGITAL-TO-ANALOG CONVERTER
中文描述： 高性能，24位，216kHz的最大采樣，八聲道音頻數(shù)字模擬轉(zhuǎn)換器
文件頁(yè)數(shù)： 26/39頁(yè)
文件大?。?/td> 551K
代理商： PCM4108CPAPT
./0
SBAS354 JUNE 2005
www.ti.com
26
SERIAL PERIPHERAL INTERFACE (SPI) PORT
OPERATION
The SPI port is a five-wire synchronous serial interface that
is used to access the on-chip control registers when the
PCM4108 is configured for Software mode operation. The
CDIN input (pin 31) is the serial data input for the port, while
CDOUT (pin 32) is used for reading back control register
contents in a serial fashion. The CSA (pin 28) and CSB (pin
29) inputs function as the chip selects for register Banks
A and B, respectively. The CCLK input (pin 30) functions
as the serial data clock, used to clock data in and out of the
port. Data is clocked into the port on the rising edge of
CCLK, while data is clocked out of the port on the falling
edge of CCLK.
There are three modes of operation supported for the SPI
port: Single Register, Continuous, and Auto-Increment.
The Single Register and Continuous modes are similar to
one another. In Continuous mode, instead of bringing the
chip select input high after writing or reading a single
register, the chip select input is held low and a new control
byte is issued with a new address for the next write or read
operation. Continuous mode allows multiple, sequential or
nonsequential register addresses to be read or written in
succession, as shown in Figure 16.
Auto-Increment mode is designed for writing or reading
multiple sequential register addresses. After the first
register is written or read, the register address is
automatically incremented by 1, so the next write or read
operation is performed without issuing another control
byte, as shown in Figure 17.
Control Byte (or Byte 0)
The control byte, or byte ‘0’, is the first byte written to the
PCM4108 SPI port when performing a write or read
operation. The control byte includes bits that define the
operation to be performed (read or write), the
auto-increment mode status, and the control register
address.
The Read/Write bit, R/W, is set to ‘0’ to indicate a register
write operation, or set to 1 for a register read operation.
The Increment bit, INC, enables or disables the
Auto-Increment mode of operation. When this bit is set to
a ‘0’, auto-increment operation is disabled, and the
operation performed is either Single Register or
Continuous. Setting the INC bit to ‘1’ enables
Auto-Increment operation.
A two-bit key code, 10
B
, follows the INC bit and must be
present in order for any operation to take place on the
control port. Any other combination for these bits will result
in the port ignoring the write or read request.
The four-bit address field, A[3:0], is used to specify the
control register address for the read or write operation, or
the starting address for an Auto-Increment write or read
operation.
CSA
CSB
CDIN
CCLK
Keep CSA and/or CSB low for writing or reading multiple registers in Continuous mode
byte 0
byte 1
byte 0
byte 1
byte N
AutoIncrement Control: Set to 0 for Single Register or Continuous Operation
Read/WriteControl: 0 = Write
1 = Read
Register Data
Control Byte
Register Data
Control Byte
CDOUT
High Impedance
byte 1
High Impedance
byte 2
byte N
Register Data
Register Data
R/W INC
1
0
A3
A2
A1
A0
Register Address
MSB
LSB
Control Byte Definition (Byte 0)
Figure 16. Single Register and Continuous Write or Read Operation
P
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參數(shù)描述
PCM4108PAPR 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-PERFORMANCE, 24-BIT, 216kHz SAMPLING, EIGHT-CHANNEL AUDIO DIGITAL-TO-ANALOG CONVERTER
PCM4108PAPT 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-PERFORMANCE, 24-BIT, 216kHz SAMPLING, EIGHT-CHANNEL AUDIO DIGITAL-TO-ANALOG CONVERTER
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