FX980 datasheet(11/86 Pages) CMLMICRO

11 / 86 page

TETRA Baseband Processor

FX980

D/980/3

Functions performed by the serial interface include:

• Power up or down and optional bypassing of selected blocks

• Setting digital filter coefficients

• Loading ramp up and ramp down increments and burst lengths for Tx

• Loading and transmitting data

• Loading offset correction, gain multiplier and phase adjustment registers

• Enabling/disabling of output via the Rx serial interface

• Vary sampling time for Rx data relative to the symbol (144kHz) clock.

• Loading data into auxiliary DACs

• Initiating conversions using auxiliary ADCs and reading results

• Writing data to, and reading data from, the Waveform Generation SRAM

• Power Ramping time step control

The three interfaces consist of the following signal pins:

SClk

Output

Serial Clock pin. This pin is common for all three interfaces.

CmdDat

In/Out

Command port Data pin. This pin is by default an input, but may be

configured as an open drain bi-directional pin.

CmdFS

Input

Command port Frame Sync pin. This pin is used to mark the first bit in a

serial frame.

CmdRdDat

Output

Command read port Data pin. This pin only has active data on it in

response to a read command.

CmdRdFS

Output

Command read port Frame Sync pin. This pin is used to mark the first bit in

a serial frame.

RxDat

Output

Receive data port Data pin. This pin is only active when the Rx Data path is

active.

RxFS

Output

Receive data port Frame Sync pin. This pin is used to mark the first bit in

a serial frame.

Note: All Frame Sync strobe signals are actually coincident with the last bit of a dataframe.

See

Figures 4 and 5 for further details.

1.5.6.1 Command Interface

A serial command word consists of a 16-bit frame. Each frame is marked by an active Frame Sync

event which precedes the MSB bit. A command word can be either a control word or a transmit data

word.

MSB

LSB

R / W

Address

Data

Command Control Serial Word

MSB

LSB

Tx Data Address

U/D

4/1

Tx Data

Command Transmit Data Serial Word

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