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CS5376A

DS612F4 35

The E2DREQ bit reads high while a configuration

command is being processed. When low, the digital

filter is ready to receive a new configuration com-

mand.

9.4 Microcontroller Configuration

Commands

A summary of available microcontroller configura-

tion commands is listed in Table 7.

Write DF Register - 0x01

This configuration command writes a specified

digital filter register. Digital filter registers control

hardware peripherals and filtering functions. See

“Digital Filter Registers” on page 86 for the bit def-

initions of the digital filter registers.

Sample Command:

Write digital filter register 0x00 with data value

0x070431. Then write 0x20 with data 0x000240.

02 03 00 00 01 00 00 00 07 04 31

Delay 1 ms, monitor SINT, or poll E2DREQ

02 03 00 00 01 00 00 20 00 02 40

Delay 1 ms, monitor SINT, or poll E2DREQ

Read DF Register - 0x02

This command reads a specified digital filter regis-

ter. The register value is requested in the first SPI

transaction, with the register value copied to

SPI1DAT1 and read in a subsequent SPI transac-

tion.

Sample Command:

Read digital filter registers 0x00 and 0x20.

02 03 00 00 02 00 00 00

[DATA] indicates data word returned from digital filter.

(DATA) indicates multiple words of this type are to be written.

Name CMD

24-bit

DAT1

24-bit

DAT2

24-bit

Description

NOP 000000 - - No Operation

WRITE DF REGISTER 000001 REG DATA Write Digital Filter Register

READ DF REGISTER 000002 REG

[DATA]

Read Digital Filter Register

WRITE FIR COEFFICIENTS 000003 NUM FIR1

(FIR COEF)

NUM FIR2

(FIR COEF)

Write Custom FIR Coefficients

WRITE IIR COEFFICIENTS 000004 a11

b11

a22

b21

b10

a21

b20

b22

Write Custom IIR Coefficients

WRITE ROM COEFFICIENTS 000005 COEF SEL - Use On-Chip Coefficients

WRITE TBS DATA 000006 NUM TBS

(TBS DATA)

Write Custom Test Bit Stream Data

WRITE ROM TBS 000007 - - Use On-Chip TBS Data

FILTER START 000008 - - Start Digital Filter Operation

FILTER STOP 000009 - - Stop Digital Filter Operation

Table 7. Microcontroller Boot Configuration Commands