MAS3504D datasheet(14/40 Pages) MICRONAS

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MAS 3504D

Micronas

3.3. Detailed MAS 3504D Command Syntax

3.3.1. Run

The ‘run’ command causes the start of a program part

at address a = (a3, a2, a1, a0). The nibble a3 is

restricted to 0hex or 1hex which also acts as command

selector. Run with address a=0hex will suspend the

encoding/decoding function and only I2C commands

are evaluated. This freezing is required if alternative

software is downloaded into the internal RAM of the

MAS 3504D. Detailed information about downloading

is provided in combination with a MAS 3504D software

development package or together with MAS 3504D

software modules available from Micronas.

Example: ‘run’ at address 1hex (start of G.729 decoder)

has the following I2C protocol:

<$3A><$68><$00><$01>

3.3.2. Write Register

The

controller

writes

the

20-bit

value

(d = d4, d3, d2, d1, d0) into the MAS 3504D register

(r = r1,r0). In contrast to memory cells, registers are

always addressed individually, and they may also

interact with built-in hardware blocks. A list of registers

is given in Section 3.5. on page 16

Example: G.729 decoding is started by writing the

value 1 into the register with the number FDhex:

<$3A><$68><$9F><$D1><$00><$00>

3.3.3. Write D0 Memory

The MAS 3504D has 2 memory areas of 2048 words

each called D0 and D1 memory. For both memory

areas, read and write commands are provided.

Example: writing one word to address d0:0321hex has

the following I2C protocol:

<$3A><$68><$A0><$00> (write D0 memory)

<$00><$01>

(1 word to write)

<$03><$21>

(start address)

<$23><$45>

(value = 12345hex)

<$00><$01>

3.3.4. Write D1 Memory

For further details, see ‘write D0 memory’ command.

SDW

data_write

AAA

a3,a2

a1,a0

SDW

data_write

AAA

9,r1

r0,d4

d4,d3

d2,d1

SDW

data_write

A,0

$0,$0

n3,n2

n1,n0

a3,a2

a1,a0

d3,d2

d1,d0

d3,d2

d1,d0

....repeat for n data values....

$0,$0

$0,d4

$0,$0

$0,d4

n3..n0: number of words to be transmitted

a3..a0: start address in MASD memory

d4..d0: data value

SDW

data_write

B,0

$0,$0

n3,n2

n1,n0

a3,a2

a1,a0

d3,d2

d1,d0

d3,d2

d1,d0

....repeat for n data values....

$0,$0

$0,d4

$0,$0

$0,d4

n3..n0: number of words to be transmitted

a3..a0: start address in MASD memory

d4..d0: data value

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