MAS3506D datasheet(19/52 Pages) MICRONAS

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PRELIMINARY DATA SHEET

MAS 3506D

Micronas

3.3.7. Write Memory (Codes Ahex and Bhex)

The memory areas D0 and D1 can be written by using

the codes ahex and bhex, respectively.

With the Write D0/D1 Memory command n 20-bit

memory cells in D0 can be initialized with new data.

Example: Write 80234hex to D1:456 has the following

I2C protocol:

<3a 68 b0 00

write D1 memory

00 01

1 word to write

04 56

start address

00 08

value = 80234hex

02 34>

3.3.8. Read Register (Code Dhex)

The MAS 3506D has an address space of 256 DSP-

registers. Some of the registers (r = r1,r0 in the figure

above) are direct control inputs for various hardware

blocks, others control the internal program flow. In

Table 3–10, the registers of interest are described in

detail. In contrast to memory cells, registers cannot be

accessed as a block but must always be addressed

individually.

Example:

Read the content of the register c8hex:

<3a 68 dc 80>

define register

<3a 69 <3b xx xd dd dd >

and read

3.3.9. Read Memory (Codes Ehex and Fhex)

The MAS 3506D has 2 memory areas called D0 and

D1 using the codes ehex and fhex for their read com-

mands, respectively.

The Read D0/D1 Memory command gives the control-

ler access to all 20 bits of the memory cells of the

MAS 3506D. The telegram for reading 3 words starting

at location D1:100 is

<3a 68 f0 00 00 03 01 00>

<3a 69 <3b xx xd dd dd

xx xd dd dd xx xd dd dd >

3.3.10.Default Read

The Default Read command immediately returns the

lower 16 bits of the main status cell (“Status”) of the

MAS 3506D and may be used to poll the processor

status. The meaning of the returned bits is given in the

description of control memory cell D1:7ee in Table 3–

11 on page 23.

SDW

data_write

a,0

0,0

x,x

x,d4

n3,n2

n1,n0

a3,a2

a1,a0

d3,d2

d1,d0

x,x

x,d4

d3,d2

d1,d0

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

1) send command

2) get register value

SDW

data_write

d,r1

r0,0

SDW

data_read

d3,d2

d1,d0

x,x

x,d4

1) send command (Read D0)

2) get register value

SDW

data_write

e,0

0,0

SDW

data_read

x,x

x,d4

n3,n2

n1,n0

a3,a2

a1,a0

d3,d2

d1,d0

x,x

x,d4

d3,d2

d1,d0

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

SDW

data_read

d3,d2

d1,d0

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