CMX981 Consumer Microcircuits Limited, CMX981 Datasheet - Page 34

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

Advanced Digital Radio Baseband Processor
5.11.22 $18-$1F
 2002 CML Microsystems Plc
Setting bit 0 in the ConfigCtrl2 register enables access to the coefficient RAMs, and resets the
coefficient pointer to the first location. In order to program new coefficients, the most significant
bits of each word must be written first ($19, $1B, $1D, $1F). When the least significant bits of each
word are written, the whole word is stored in the RAM and the coefficient pointer is incremented to
the next location (if bit 1 in ConfigCtrl2 is low).
$19
$1B
$1D
$1F
$18
$1A
$1C
$1E
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Set this
Set this
bit low.
bit low.
Used.
Used.
Not
Not
7
7
7
7
7
7
7
7
CoeffRamData
Set this
Set this
bit low.
bit low.
Used.
Used.
Not
Not
6
6
6
6
6
6
6
6
Set this
Set this
bit low.
bit low.
Transmit Low Pass Filter Coefficient [15:8]
Used.
Used.
Receive Low Pass Filter Coefficient [7:0]
Not
Not
Transmit 79-tap Filter Coefficient [7:0]
Transmit RRC Filter Coefficient [15:8]
5
5
5
5
5
5
5
5
Transmit RRC Filter Coefficient [7:0]
Receive RRC Filter Coefficient [7:0]
Set this
Set this
Coefficient Memory I/O Access Addresses
bit low.
bit low.
Used.
Used.
Not
Not
4
4
4
4
4
4
4
4
34
Transmit 79-tap Filter Coefficient [11:8]
Transmit RRC Filter Coefficient [11:8]
3
3
3
3
3
3
3
3
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
CMX981
D/981/1