MAS3587F datasheet(18/82 Pages) MICRONAS

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MAS 3587F

ADVANCE INFORMATION

Micronas

3.1.3. Naming Convention

The description of the various controller commands

uses the following formalism:

– Abbreviations used in the following descriptions:

address

data value

count value

offset value

don’t care

– A data value is split into 4-bit nibbles which are num-

bered beginning with 0 for the least significant nib-

ble.

– Data values in nibbles are always shown in hexa-

decimal notation.

– A hexadecimal 20-bit number d is written, e.g. as

d = 17C63hex, its five nibbles are

d0 = 3hex, d1 = 6hex, d2 = Chex, d3 = 7hex, and

d4 = 1hex.

– Variables used in the following descriptions:

I2C address:

3C/3Ehex

3D/3Fhex

DSP core:

data_write

68hex

data_read

69hex

Codec:

codec_write 6Chex

codec_read 6Dhex

– Bus signals

SStart

PStop

AACK = Acknowledge

NAK = Not acknowledge

W Wait = I2C Clockline is held low,

while the MAS 3587F is processing

the I2C command

– Symbols in the telegram examples

Start Condition

Stop

data bytes

ignore

All telegram numbers are hexadecimal, data origi-

nating from the MAS 3587F are greyed.

Example:

write data to DSP

read data from DSP

and stop with NAK

Fig. 3–1 shows I2C bus protocols for write and read

operations of the interface; the read operations require

an extra start condition and repetition of the chip

address with the device read command (DR). Fields

with signals/data originating from the MAS 3587F are

marked by a gray background. Note that in some

cases the data reading process must be concluded by

a NAK condition.

Fig. 3–1: Example of an I2C bus protocol for the MAS 3587F (MSB first; data must be stable while clock is high)

SDA

SCL

Start

Stop

0 (ACK)

1 (NAK)

low data word

high data word

subaddress

low data word

high data word

subaddress

Example: I2C write access

Example: I2C read access

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