FX980 datasheet(18/86 Pages) CMLMICRO

18 / 86 page

TETRA Baseband Processor

FX980

D/980/3

ConfigCtrl1

Title:

Configuration Control register

Address:

$0x00

Function:

Description:

General configuration bits, together with operational control signal bits.

Bit

Name

Active State

Function

DataRateHi

High

When set active all serial port data transfers will be at

half of the master clock rate. When inactive, all serial

port data rates will be at a quarter of the master clock

rate. This has the effect of altering the Rx sample output

rate from 8 times the symbol rate when active to 4 times

when inactive.

TxHandshakeEn

High

When set active enable the transmit hardware interlock

protocol, thereby stopping the Serial Clock (SClk) if the

transmit path is enabled and the transmit FIFO is full.

BiDirCmdPortEn

High

When this bit is set active the Cmd port will drive its

data line out of the chip for the last 8 bits of read

operations. When set inactive command read data will

be returned on either the Rx or the CmdRd port

(default).

RxDataForCmdRdEn

High

This bit only takes effect if the BiDirCmdPortEn bit is

inactive. When set active this bit causes all command

read operations to respond with data on the Rx serial

port. When set inactive the command read data will be

output via the CmdRd port (default).

(5,4)

CommandReadDataMode

The BiDirCmdPortEn bit and RxDataForCmdRdEn bit

together control the method by which command read

data is returned to the user.

(Default) Read data returned on CmdRd port.

Read data returned on Rx port and CmdRd port

10,11

Read data returned on Cmd port.

LowRxRdFS

High

When set active both the CmdRdFS and the RxFS

output pins will be driven active low, when set inactive

the two frame sync's will be driven active high (default).

RxDataPortDisable

High

When set active tristates the RxDat and RxFS pins.

RdCmdPortDisable

High

When set active tristates the CmdRdDat and CmdRdFS

pins.

SymboModuBypass

High

Setting this bit bypasses the Modulator, thereby taking

the least significant 3 bits of each Command Transmit

Data Serial Word received via the serial interface to

represent an absolute constellation mapping.

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