CS5378 datasheet(27/88 Pages) CIRRUS

27 / 88 page

CS5378

DS639F2

The maximum number of bytes that will be written

for a single configuration is less than 2 KByte

(16 Kbit), including command overhead:

Supported serial configuration EEPROMs are

SPI mode 0 (0,0) compatible, 16-bit addresses, 8-

bit data, larger than 2 KByte (16 KBit). ATMEL

AT25640, AT25128, or similar serial EEPROMs

are recommended.

8.4 EEPROM Configuration Commands

A summary of available EEPROM commands is

shown in Table 7.

Write DF Register - 0x01

This EEPROM command writes a data value to the

specified digital filter register. Digital filter regis-

ters control hardware peripherals and filtering

functions. See “Digital Filter Registers” on page 71

for the bit definitions of the digital filter registers.

Sample Command:

Write digital filter register 0x00 with data value

0x060431. Then write 0x20 with data 0x000240.

01 00 00 00 06 04 31

01 00 00 20 00 02 40

Write FIR Coefficients - 0x02

This EEPROM command writes custom coeffi-

cients for the FIR1 and FIR2 filters. The first two

data words set the number of FIR1 and FIR2 coef-

ficients to be written. The remaining data words are

the concatenated FIR1 and FIR2 coefficients.

A maximum of 255 coefficients can be written for

each FIR filter, though the available digital filter

computation cycles will limit their practical size.

See “FIR Filter” on page 44 for more information

about FIR filter coefficients.

Sample Command:

Write FIR1 coefficients 0x00022E, 0x000771 then

FIR2 coefficients 0xFFFFB9, 0xFFFE8D.

02 00 00 02 00 00 02

00 02 2E 00 07 71 FF FF B9 FF FE 8D

Write IIR Coefficients - 0x03

This EEPROM command writes 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 always

immediately follow the command byte. The IIR co-

efficient write order is: a11, b10, b11, a21, a22,

b20, b21, and b22. See “IIR Filter” on page 52 for

more information about IIR filter coefficients.

Figure 16. 8 Kbyte EEPROM Memory Organization

0000h

1FFFh

EEPROM

Manufacturing

Information

EEPROM

Command and

Data Values

Mfg Header

8-bit Command

0010h

N x 24-bit Data

8-bit Command

N x 24-bit Data

. . .

Table 6. Maximum EEPROM Configuration

Memory Requirement

Bytes

Digital Filter Registers (12)

FIR Coefficients (255+255)

1537

IIR Coefficients (3+5)

‘Filter Start’ Command

Total Bytes

1647

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