CMX981 Consumer Microcircuits Limited, CMX981 Datasheet - Page 45

• Manufacturer Part Number: CMX981
• Description: Advanceddigital Radio Baseband Processor (tetra Etc.)
• Manufacturer: Consumer Microcircuits Limited

Advanced Digital Radio Baseband Processor
5.11.44 $5C-$5D
5.11.45 $5E-$5F
5.11.46 $60-$7F
 2002 CML Microsystems Plc
The value in this register controls the frequency of the ring tone generator, given by the equation:
Writing to this register passes data to the voice codec decode path. Reading from this register
returns the latest sample from the voice codec encode path.
$60-$6F
$70-$7F
The four least significant bits of the address are used as bits 11 to 8 of the data word.
These registers are the direct access points to the 79-tap filter inputs.
$5C
$5E
$5D
$5F
Bit
Bit
Bit
Bit
Bit
F = N
11
Not used.
Not used.
Set this
Set this
bit low
bit low
val
7
7
7
7
CodecToneFreq
CodecData
DirectWrite79tap
DirectWrite79tapI
DirectWrite79tapQ
/ 2.048 Hz
10
Not used.
Not used.
Set this
Set this
bit low
bit low
9
6
6
6
6
where: F is the frequency of the generated tone, and
8
Not used.
Set this
bit low
5
5
5
5
7
Voice Codec Tone Frequency Register
N
Voice Codec Transmit/Receive Data Register
Transmit Path Direct Write Data Register (Write only)
Transmit Path Direct Write Data Register (I)
Transmit Path Direct Write Data Register (Q)
val
Direct Write Data [11:0]
45
Tone Frequency [7:0]
is the value in the register.
Codec Data [7:0]
6
4
4
4
4
5
Codec Data [13:8]
3
3
3
3
Tone Frequency [12:8]
4
2
2
2
2
3
2
1
1
1
1
1
0
0
0
0
CMX981
D/981/1
0