CMX980AL7 CML Microcircuits, CMX980AL7 Datasheet - Page 29

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

TETRA Baseband Processor
Title:
Address:
Function:
Description:
Bit
7
6
5
4
3
2
1
0
1999 Consumer Microcircuits Limited
TxCtrlEn
TxDirectWriteEn
LinearRamp
TxClkStop
TxEn
TxRampEn
TxFirCoeffReset
TxSetup
Transmit Setup register
$0x03
RW
Sets up the transmit functions.
Name
0
0
Address field [6:0]
0
Low
High
High
High
High
High
Low
Active State
0
Address and Data format for TxSetup access
0
RW
RW
RW
RW
RW
RW
RW
RW
1
Reserved. Set this bit Low. Undefined on read.
When set active enables the Tx control logic clock (default
state). When inactive removes Tx control logic clock and
reduces power consumption. Ensure bit is active (Low)
before commencing Tx FIFO operations.
When asserted, enables direct write to the I and Q 79-tap
filter inputs. This bypasses the FIFO and DQPSK
modulator. See the Page 1 addressed registers.
When asserted (high) selects Linear Ramping, default
(Low) selects Sigmoidal Ramping.
When set active causes the TxEn bit to also be used to
gate the Tx Data path master clock. When inactive (default
state) the Tx Data path master clock is always supplied.
When set active, enables the Tx Data path, allowing
transmission to start when the correct enable sequence
has been seen. This bit may only be cleared when the
TxPathEn status bit in the TxFIFOStatus Register is
inactive, setting inactive during a transmission cycle will
cause erroneous behaviour. This bit also acts as a transmit
section power enable bit.
When set active, this bit enables the transmit amplitude
ramping function. Ramping is then controlled by the
TxRampUp bit of the TxData Register When this bit is
inactive, the TxRampUp bit will directly control the transmit
amplitude (High meaning full amplitude, Low meaning zero
amplitude).
When set active this bit forces all the Tx Data path filters to
load their default coefficient values. This bit will be set
active on taking N_RESET Low, and therefore needs to be
deactivated before default filter coefficients can be
overwritten.
1
29
R
D6 D5 D4 D3 D2 D1 D0
Data field [6:0]
Function
CMX980A
D/980A/3