CMX980AL7 CML Microcircuits, CMX980AL7 Datasheet - Page 30

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

TETRA Baseband Processor
Title:
Address:
Function:
Description:
Data write with symbol modulator not bypassed
Data write with symbol modulator bypassed
7:6
5:4
3:2
1:0
8:3
2:0
Bit
Bit
9
8
9
1999 Consumer Microcircuits Limited
TxRampUp
MultiSymbol
TxRelSymbol4
TxRelSymbol3
TxRelSymbol2
TxRelSymbol1
TxRampUp
(not used)
TxAbsSymbol
TxData
Transmit Data register
$0x04 - $0x07 (Mapped over four locations, two address bits being used as data bits)
W
R
This transmit data register is 10 bits wide. The two least significant bits of the address bus are
used to drive bits 8 and 9, hence it can be considered to be mapped over four consecutive
locations. This data word is written into a four-word deep FIFO. The FIFO will be read when the
Tx Data path demands data. This will only occur when the TxEn bit of the TxSetup Register is
set active. For test purposes the FIFO data output may be accessed by reading these registers.
Name
Name
FIFO input
FIFO output
High
High
Data
Data
Data
Data
High
Data
Data
Active State
Active State
W
W
W
W
W
W
W
W
W
This bit is written to the FIFO. While the TxEn bit of the
TxSetup Register is active, it controls the Tx Data path
ramping. Setting it active will cause the amplitude to ramp
up to its full value, conversely setting the bit inactive will
cause the amplitude to ramp down to its minimum value. If
the bit is changed while the amplitude is being ramped, the
ramp direction will change to the direction set by this bit.
While the TxRampEn bit is inactive, the TxRampUp bit will
directly control the transmit amplitude (High meaning full
amplitude and Low meaning zero amplitude).
This bit is written to the FIFO and when this bit is set
active, the FIFO symbol data will be marked as a four
symbol word. When set inactive, the FIFO symbol data
will be marked as a single symbol word. This bit is inactive
if the SymbModuBypass bit of the ConfigCtrl1 Register is
active.
Fourth symbol in word to be written to FIFO.
Third symbol in word to be written to FIFO.
Second symbol in word to be written to FIFO.
First symbol in word to be written to FIFO.
(See above)
Redundant data which is still written into the FIFO. Set
these bits Low.
IQ constellation point which is written into the FIFO.
30
Function
Function
CMX980A
D/980A/3