Df Registers; Df Commands; Spi - Cirrus Logic CDB5378 Manual

3.5.1

DF Registers

The DF Registers sub-panel writes and reads registers within the digital filter. Digital filter registers con-
trol operation of the digital filter and the included hardware peripherals, as described in the digital filter
data sheet.
Control
Address
Data
Read
Write
3.5.2

DF Commands

The DF Commands sub-panel sends commands to the digital filter. The digital filter commands and their
required parameters are described in the digital filter data sheet.
Not all commands require write data values, and not all commands will return read data values. Some
commands require formatted data files for uploading custom coefficients. Example formatted data files
are included in the SPI sub-directory of the software installation.
Control
Command
Write Data 1
Write Data 2
Read Data 1
Read Data 2
Send
3.5.3

SPI

The SPI sub-panel writes and reads registers in the digital filter SPI register space. They can be used to
check the SPI serial port status bits or to manually write commands to the digital filter.
Control
Start Address
Data Word 1
Data Word 2
Data Word 3
Read 1 Word
Read 3 Words
Write 1 Word
Write 3 Words
52
Selects a digital filter register.
Contains the data written to or read from the register.
Initiates a register read.
Initiates a register write.
Selects the command to be written to the digital filter.
Contains the SPI1DAT1 data to be written to the digital filter.
Contains the SPI1DAT2 data to be written to the digital filter.
Contains the SPI1DAT1 data read from the digital filter.
Contains the SPI1DAT2 data read from the digital filter.
Initiates the digital filter command.
Selects the address to begin the SPI transaction.
Contains the first data word written to or read from the SPI registers.
Contains the second data word written to or read from the SPI registers.
Contains the third data word written to or read from the SPI registers.
Initiates a 1 word SPI read transaction.
Initiates a 3 word SPI read transaction.
Initiates a 1 word SPI write transaction.
Initiates a 3 word SPI write transaction.
Description
Description
Description
CDB5378
DS639DB4