CMX980AL7 CML Microcircuits, CMX980AL7 Datasheet - Page 63

• Manufacturer Part Number: CMX980AL7
• Description: TETRA Baseband Processor
• Manufacturer: CML Microcircuits

TETRA Baseband Processor
Title:
Address:
Function:
Description:
7:0
7:1
Bit
0
1999 Consumer Microcircuits Limited
1
1
RampDnIncLSB
RampDnIncMSB
TxRampDnDec
0
0
Address field
0
0
Transmit Ramp Down Decrement registers.
$0x4E to $0x4F (mapped over 2 locations)
RW
The value in this register sets the scale of the Tx amplitude gain decrements which occur over
each sample clock period, thus determining the Tx amplitude ramp down time period. The value
is always positive. The ramp down time, in terms of the number of symbols, is given by the
formula:
Name
Address $0x4E
Address $0x4F
1
1
1
1
[6:0]
N
symbols
1
1
Data
Data
Active State
Address and Data format for TxRampDnDec access
0
1
N
64
R
RW
RW
inc
RW
R
Least significant 8 bits of the ramp down decrement
register.
Reserved. Set these bits Low. Undefined on read.
Most significant bit of the ramp down decrement register.
R
Where:
R
63
R
N
N
R
inc
symbols
R D8
is the ramp time in terms of number
of symbols.
is the value in the register.
Function
D7 D6 D5 D4 D3 D2
Data field [8:0]
CMX980A
D1 D0
D/980A/3