MAS3507D datasheet(21/60 Pages) MICRONAS

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PRELIMINARY DATA SHEET

MAS 3507D

Micronas

3.3.2. Read Control Interface Data

An internal memory array keeps the status information

of the MAS 3507D (see Table 3–10). The ‘read control

interface data’ command can be used for quick access

to this memory array. A successive range of memory

locations may be read by passing a 6-bit offset value

“o” and a 6-bit count value “n” as parameter.

Both values are combined in a 12-bit = 4 nibble field

x2, x1, x0. If, for example, 4 words (n = 4) starting with

one word offset (o = 2), i.e. the MPEG Status 2, the

CRCErrorCount, and NumberOfAncillaryBits are read

from the control memory array, the 3 nibbles x2, x1 and

x0 are evaluated as shown in the following table.

The complete I2C protocol reads as:

<$3a><$68><$30><$83>

<$3a><$69><$3b><receive 3 16-bit data values>

The ‘read control interface data’ command resets the

MPEG-FRAME-SYNC at PI4 pin (see Section 2.9. on

page 16).

3.3.3. Write Register

The

controller

writes

the

20-bit

value

(d = d4,d3,d2,d1,d0) into the MAS 3507D register

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

always addressed individually, and they may also inter-

act with built-in hardware blocks. A list of useful regis-

ters is given in the next section.

Example: Muting can be realized by writing the value 1

into the register with the number $aa:

<$3a><$68><$9a><$a1><$00><$00>

3.3.4. Write D0 Memory

The MAS 3507D has 2 memory areas of 2048 words

each called D0 and D1 memory. For both memory

areas, read and write commands are provided.

Example: reconfiguration of the output to 16 bit without

delay has the following I2C protocol:

<$3a><$68><$a0><$00> (write D0 memory)

<$00><$01>

(1 word to write)

<$03><$2f>

(start address)

<$00><$10>

(value = $00010)

<$00><$00>

<$3a><$68><$04><$75> (run command)

3.3.5. Write D1 Memory

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

6-bit values

offset: 2

number of words: 3

bit

1000001

nibble

dev_write

A data_write A

$3, x2

d3, d2

x1,x0

dev_write

data_read

A S

dev_read

A d1,d0

Nak

1) send command

2) get ancillary data values

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

d3, d2

d1,d0

d3...d0: 16-bit data values

(ancillary word 0)

A P

x2...x0: combined count, offset value

dev_write

A data_write A $9, r1 A

r0, d0

d4, d3

A d2, d1 A

dev_write

A data_write

$A, $0

A $0,$0

A n3,n2

A n1,n0

A a3,a2

a1,a0

n3..n0: number of words

a3..a0: start address in MASD memory

d4..d0: data value

n3,n2

A n3,n2

A d1,d0

A $0,$0

$0,d4

d3,d2

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

A n3,n2

A d1,d0

A $0,$0

$0,d4

d3,d2

A P

dev_write

A data_write A $B, $0 A $0,$0

A n3,n2

A n1,n0

A a3,a2

a1,a0

n3..n0: number of words to be transmitted

a3..a0: start address in MASD memory

d4..d0: data value

n3,n2

A n3,n2

A d1,d0

A $0,$0

$0,d4

d3,d2

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

A n3,n2

A d1,d0

A $0,$0

$0,d4

d3,d2

A P

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