FX980 datasheet(24/86 Pages) CMLMICRO

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TETRA Baseband Processor

FX980

D/980/3

TxData

Title:

Transmit Data register

Address:

$0x04 - $0x07 (Mapped over four locations, two address bits being used as data bits)

Function:

FIFO input

FIFO output

Description:

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 FIFO. The function is only decoded when the FIFO is

read (there is an exception for the first data word). 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.

Data write with symbol modulator not bypassed

Bit

Name

Active State

Function

TxRampUp

High

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).

MultiSymbol

High

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.

7:6

TxRelSymbol4

Data

Fourth symbol in word to be written to FIFO.

5:4

TxRelSymbol3

Data

Third symbol in word to be written to FIFO.

3:2

TxRelSymbol2

Data

Second symbol in word to be written to FIFO.

1:0

TxRelSymbol1

Data

First symbol in word to be written to FIFO.

Data write with symbol modulator bypassed

Bit

Name

Active State

Function

TxRampUp

High

(See above)

8:3

(not used)

Data

Redundant data which is still written into the FIFO. Set

these bits Low.

2:0

TxAbsSymbol

Data

IQ constellation point which is written into the FIFO.

FX980 Datasheet(PDF) 24 Page - CML Microcircuits

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