FX980 datasheet(23/86 Pages) CMLMICRO

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TETRA Baseband Processor

FX980

D/980/3

TxSetup

Title:

Transmit Set-up register

Address:

$0x03

Function:

Description:

Sets up the transmit functions.

Bit

Name

Active State

Function

7:4

Reserved. Set these bits Low. Undefined on read.

TxClkStop

High

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.

TxEn

High

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.

TxRampEn

High

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).

TxFirCoeffReset

Low

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.

• Address and Data format for TxSetup access

Data field [7:0]

Address field [6:0]

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