FX980 datasheet(27/86 Pages) CMLMICRO

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TETRA Baseband Processor

FX980

D/980/3

RxSetup1

Title:

First Receive Set-up control register

Address:

$0x08

Function:

Description:

Receive path set-up and initialisation control bits.

Bit

Name

Active State

Function

Rx32BitMode

High

When set active, the Rx port operates on 32-bit frames -

I data in the MSB word, Q data in the LSB word.

RxSampleSel

High

This bit is used to select which pair of I,Q samples is

supplied from the possible two when the DataRateHi bit in

ConfigCtrl1 register is in the low mode (inactive). It has no

effect when DataRateHi is active.

RxClkStop

High

When set active causes the RxEn bit to also be used to

gate the Rx Data path master clock. When inactive (default

state) the Rx Data path master clock is always supplied.

RxEn

High

When set active, enables the Rx Data path, which then

starts to process the differential data on the IRXP,IRXN

and QRXP,QRXN pins, outputting results via the Rx serial

port. This bit also acts as a receive section power enable

bit.

RxBistActive

High

When set active, enables Rx Built-In Self Test (BIST)

operation.

AnaAdcReset

Pulse W

When this bit is set High, a 4-clock-cycle ADC auto reset

event is generated. It is not necessary to clear this bit

before another ADC auto reset event is initiated.

The read state of this bit indicates the logic level last written

to this bit. It does not have a functional significance and is

only available for test purposes.

AnaEnAutoReset

Low

When active this bit enables the ADC auto reset function.

On taking N_RESET Low, this bit is set active, which is the

default operating condition.

RxFirCoeffReset

Low

When set active forces all the Rx 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. Normal filter operation is unaffected by leaving

this bit set.

FX980 Datasheet(PDF) 27 Page - CML Microcircuits

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