MAS3587F datasheet(24/82 Pages) MICRONAS

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MAS 3587F

ADVANCE INFORMATION

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3.3. DSP Core

The DSP Core of the MAS 3587F has two RAM banks

denoted D0 and D1. The word size is 20 bits. All RAM

addresses can be accessed in a 20-bit or a 16-bit

mode via I2C bus. For fast access of internal DSP

states, the processor core also has an address space

of 256 data registers. All register and RAM addresses

are given in hexadecimal notation.

3.3.1. Access Protocol

The access of the DSP Core in the MAS 3587F uses a

special command syntax. The commands are exe-

cuted by the DSP during its normal operation without

any loss or interruption of the incoming data or outgo-

ing audio data stream. These I2C commands allow the

controller accessing the internal DSP registers and

RAM cells and thus, monitoring internal states and set-

ting the parameters for the DSP firmware. This access

also provides a download option for alternative soft-

ware modules.

The MAS 3587F firmware scans the I2C interface peri-

odically and checks for pending or new commands.

However, due to some time critical firmware parts, a

certain latency time for the response has to be

expected. The theoretical worst case response time

does not exceed 4 ms. However, the typical response

time is less than 0.5 ms.

Table 3–4 gives an overview over the different com-

mands which the DSP Core receives via the I2C data

transmitted after the “data_write” subaddress byte. A

second auxiliary code nibble is used for the short

memory (16-bit) access commands.

Due to the 16-bit width of the I2C data register, all

actions transmit telegrams with multiples of 16 data

bits.

Fig. 3–2: General core access protocol

$68

code , ... A

... , ...

Table 3–4: Basic controller command codes

Code

(hex)

Command

Function

0...3

Run

Start execution of an internal program. Run with start address 0 means

freeze the operating system.

Read Ancillary Data

The controller reads a block of MPEG Ancillary Data from the MAS 3587F

Fast Program Download

The controller downloads custom software via the PIO interface

Read from Register

The controller reads an internal register of the MAS 3587F

Write to Register

The controller writes an internal register of the MAS 3587F

Read D0 Memory

The controller reads a block of the DSP memory

Read D1 Memory

The controller reads a block of the DSP memory

Write D0 Memory

The controller writes a block of the DSP memory

Write D1 Memory

The controller writes a block of the DSP memory

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