MAS 35x9F
DATA SHEET
3. Controlling
nibble.
– Data values in nibbles are always shown in hexa-
decimal notation.
2
3.1. I C Interface
Controlling between the MAS 35x9F and the external
controller is done via an I C slave interface.
– A hexadecimal 20-bit number d is written, e.g. as
2
d = 17C63 , its five nibbles are
hex
d0 = 3 , d1 = 6 , d2 = C , d3 = 7 , and
hex
hex
hex
hex
hex
3.1.1. Device Address
d4 = 1
.
– Variables used in the following descriptions:
The device addresses are 3C/3E
(device write
hex
I²C address:
“DW”) and 3D/3F
(device read, “DR”) as shown in
hex
2
DW3C/3E I C device write
hex
Table 3–1. The device address pair 3C/3D
the DVS pin is connected to VSS, the device address
applies if
hex
2
DR3D/3F I C device read
hex
DSP core:
pair 3E/3F
I2CVDD.
applies if the DVS pin is connected to
hex
data_write68 DSP data write
hex
data_read69 DSP data read
hex
Codec:
2
Table 3–1: I C device address
codec_write6C codec write
hex
codec_read6D codec read
hex
A7
A6
A5
A4
A3
A2
A1
W/R
– Bus signals
S
P
A
N
Start
Stop
0
0
1
1
1
1
DVS
0/1
ACK = Acknowledge
NAK = Not acknowledge
2
I C clock synchronization is used to slow down the
interface if required.
2
W Wait = I C clock line is held low
while the MAS 35x9F is processing
the current I C command
2
2
3.1.2. I C Registers and Subaddresses
– Symbols in the telegram examples
The interface uses one level of subaddresses. The
MAS 35x9F interface has 7 subaddresses allocated
for the corresponding I C registers. The registers can
be divided into three categories as shown in Table 3–
2.
<
>
Start Condition
Stop
2
dd
xx
data bytes
ignore
All telegram numbers are hexadecimal, data origi-
nating from the MAS 35x9F are represented as gray
letters.
Example:
The address 6A
and task select. The other addresses are used for data
transfer from/to the MAS 35x9F.
is used for basic control, i.e. reset
hex
<DW 68 dd dd >
write data to DSP
<DW 69 <DR dd dd > read data from DSP
2
The I C registers of the MAS 35x9F are 16 bits wide,
2
the MSB is denoted as bit[15]. Transmissions via I C
bus have to take place in 16-bit words (two byte trans-
fers, MSB sent first); thus, for each register access,
2
Fig. 3–1 shows I C 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 35x9F are
marked by a gray background.
2
two 8-bit data words must be sent/received via I C
bus.
3.1.3. Naming Convention
The description of the various controller commands
uses the following formalism:
Note: In some cases the data reading process must
be concluded by a NAK condition.
– Abbreviations used in the following descriptions:
a
d
n
o
r
address
data value
count value
offset value
register number
don’t care
3.2. Direct Configuration Registers
x
The task selection of the DSP and the DC/DC convert-
ers are controlled in the direct configuration registers
CONTROL, DCCF, and DCFR.
– Memory addresses, like D1:89f, are always in hexa-
decimal notation.
– A data value is split into 4-bit nibbles which are
numbered beginning with 0 for the least significant
22
June 30, 2004; 6251-505-1DS
Micronas
MICRONAS [ MICRONAS ]
