CMX981 Consumer Microcircuits Limited, CMX981 Datasheet - Page 38

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

Advanced Digital Radio Baseband Processor
5.11.29 $2C-$2D
5.11.30 $2E-$2F
 2002 CML Microsystems Plc
For write access, the least significant bit of the address is used as bit 8 of the data word.
The value of this register sets the scale of the transmit amplitude gain increments which occur
over each sample period, thus determining the amplitude ramp up time. The value is always
positive. The ramp up time, in number of symbols is:
For read access, two read commands must be issued.
The least significant bit of the address is used as bit 8 of the data word.
The value of this register sets the scale of the transmit amplitude gain decrements which occur
over each sample period, thus determining the amplitude ramp down time. The value is always
positive. The ramp down time, in number of symbols is:
For read access, two read commands must be issued.
$2C
$2E
$2D
$2F
Bit
Bit
Bit
Bit
Bit
Bit
N
N
sym
sym
Undefined
Not Used.
Undefined
Not Used.
on read.
on read.
= 64 / N
= 64 / N
8
8
7
7
7
7
TxRampUpInc
TxRampDnDec
inc
inc
Undefined
Not Used.
Undefined
Not Used.
on read.
7
on read.
7
where: N
where: N
6
6
6
6
N
N
Undefined
Not Used.
6
6
Undefined
Not Used.
on read.
sym
inc
sym
inc
on read.
5
5
is the value in the register.
is the value in the register.
5
5
is the ramp time in number of symbols, and
is the ramp time in number of symbols, and
Transmit ramp down decrement [8:0]
Transmit ramp up increment [8:0]
Transmit ramp down decrement [7:0]
Transmit Ramp Up Increment Register
Transmit Ramp Down Decrement Register
Transmit ramp up increment [7:0]
5
5
Undefined
38
Not Used.
Not Used.
Undefined
on read.
on read.
4
4
4
4
4
4
Not Used.
Undefined
Not Used.
Undefined
on read.
on read.
3
3
3
3
3
3
Undefined
Not Used.
Undefined
Not Used.
on read.
on read.
2
2
2
2
2
2
Not Used.
Undefined
Not Used.
Undefined
on read.
on read.
1
1
1
1
1
1
ramp down
decrement
increment
Transmit
Transmit
ramp up
CMX981
D/981/1
[8]
0
0
[8]
0
0
0
0