CS5376-BS View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS5376-BS Datasheet PDF : 122 Pages
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CS5376
Write IIR Coefficients - 0x03
Write TBS Data - 0x05
Type
CMD
DATA
DATA
DATA
DATA
DATA
DATA
DATA
DATA
Description
0x03 - IIR Coefficient Write Cmd
IIR Coefficient a11
IIR Coefficient b10
IIR Coefficients b11
IIR Coefficients a21
IIR Coefficients a22
IIR Coefficients b20
IIR Coefficients b21
IIR Coefficients b22
This EEPROM command uploads custom coeffi-
cients for the two stage IIR filter. The IIR architec-
ture and number of coefficients is fixed, so eight
data words containing coefficient values immedi-
ately follow the command byte. The IIR coefficient
write order is: a11, b10, b11, a21, a22, b20, b21,
and b22.
The IIR filter consists of a 1st order filter requiring
three coefficients (a11, b10, b11) and a 2nd order
filter requiring five coefficients (a21, a22, b20,
b21, b22). A 3rd order filter is implemented by run-
ning both the 1st and 2nd order filters. See “IIR Fil-
ter” on page 61 for more information about the IIR
filter.
Write ROM Coefficients - 0x04
Type
CMD
Description
0x04 - ROM Coefficient Write Cmd
This EEPROM command writes the on-chip refer-
ence coefficients for FIR1, FIR2, IIR 1st order, and
IIR 2nd order filters for use by the decimation en-
gine. No data words are required for this EEPROM
command. See “Reference Coefficients” on
page 63 for more information about the reference
FIR and IIR coefficient sets.
Type
CMD
DATA
DATA
Description
0x05 - TBS Data Write Cmd
Number of TBS Data
(TBS Data)
This EEPROM command uploads a custom data
set for the test bit stream (TBS) generator. The first
data word sets the number of TBS data to be written
and the remaining data words are the TBS data val-
ues.
This command, along with the ability to program
the test bit stream generator interpolation and clock
rate, allows the creation of custom frequency test
signals. See “Test Bit Stream Generator” on
page 81 for information on generating specific test
frequencies using custom test bit stream data sets.
Write ROM TBS Data - 0x06
Type
CMD
Description
0x06 - TBS ROM Data Write Cmd
This EEPROM command writes the on-chip test bit
stream (TBS) data for use by the TBS generator.
No data words are required for this EEPROM com-
mand. See “Test Bit Stream Generator” on page 81
for information on generating test frequencies us-
ing the on-chip test bit stream data set.
Filter Start - 0x07
Type
CMD
Description
0x07 - Filter Start Command
This EEPROM command initializes the decimation
engine and starts the digital filters. It also ends the
EEPROM boot loader operation and places the
SPI 1 port into slave mode. No data words are re-
quired for this EEPROM command.
After receiving the Filter Start command, the deci-
mation engine uses the filter configuration speci-
fied in the FILT_CFG register (0x20) and filter
DS256PP1
25
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