Cirrus Logic CDB5378, Manual

Page: 52 / 75

CDB5378
52 DS639DB4
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.
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.
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 Description
Address Selects a digital filter register.
Data Contains the data written to or read from the register.
Read Initiates a register read.
Write Initiates a register write.
Control Description
Command Selects the command to be written to the digital filter.
Write Data 1 Contains the SPI1DAT1 data to be written to the digital filter.
Write Data 2 Contains the SPI1DAT2 data to be written to the digital filter.
Read Data 1 Contains the SPI1DAT1 data read from the digital filter.
Read Data 2 Contains the SPI1DAT2 data read from the digital filter.
Send Initiates the digital filter command.
Control Description
Start Address Selects the address to begin the SPI transaction.
Data Word 1 Contains the first data word written to or read from the SPI registers.
Data Word 2 Contains the second data word written to or read from the SPI registers.
Data Word 3 Contains the third data word written to or read from the SPI registers.
Read 1 Word Initiates a 1 word SPI read transaction.
Read 3 Words Initiates a 3 word SPI read transaction.
Write 1 Word Initiates a 1 word SPI write transaction.
Write 3 Words Initiates a 3 word SPI write transaction.