CS43198 datasheet(52/137 Pages) CIRRUS

52 / 137 page

DS1156F1

CS43198

4.12 Control Port Operation

To directly connect the ADR pin and ground, the last two bits of the I2C address are configured as the default 00. For the

other options, use a resistor (with 5% accuracy) as suggested in the Table 4-12.

If the operation is a write, the 3 bytes after the chip address are the memory address pointer (MAP) that select the address

of the register to be read or written to next. The byte following the MAP is the control byte. Bit[0] of the control byte, INCR,

selects whether autoincrementing is to be used (INCR = 1), allowing successive reads or writes of consecutive registers.

Bits[2:1] of the control byte indicate the size of the data for the autoincrement to be acted on. Table 4-13 explains the

format for the I2C control byte.

Each byte transferred on the I2C bus is separated by an acknowledge (ACK) bit. The CS43198 acknowledges each input

byte read from the host, and the host must acknowledge each byte transmitted from the CS43198.

For write operations, the data bytes following the MAP byte are written to the CS43198 register addresses pointed to by

the last received MAP address, plus however many autoincrements have occurred. Fig. 4-29 shows a write pattern with

autoincrementing.

Figure 4-29. Control Port Timing, I2C Writes with Autoincrement (8-bit Data Access)

Table 4-12. I2C Address Configurations

Connection Type

Resistor Value (

)

Last Two Bits of I2C Address

Pull-up to VL

4990

Pull-down to GND

4990

Pull-down to GND

00 (Default)

Table 4-13. I2C Control-Byte Format

Bit

Name

Description

7:3

—

Reserved

Default: 0

2:1

SIZE

00 8-bit (1 byte)

01–11 Reserved

INCR

Setting this bit allows the MAP address to autoincrement. The MAP address automatically increments every SIZE + 1 bytes

accessed consecutively.

0 Disabled

1 Enabled

SCL

CHIP ADDRESS

(WRITE)

MAP BYTE

High (23:16)

START

STOP

ACK

SDA

Source

Master

Pull-up

Slave

Pull-up

ACK

Slave

6 7 8

17 18

7 6 5 4 3 2 1 0

ACK

MAP BYTE

Mid (15:8)

MAP BYTE

Low (7:0)

ACK

CONTROL

BYTE

7 6 5 4 3 2 1 0

37 38

Empty

26 27

39 40 41 42 43 44

DATA

BYTE 1

DATA

BYTE N

Master

Slave

MAP

ADDRESS

MAP

ADDRESS

+ (N–1)

ACK

Addr = 01100

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