RF2968 Просмотр технического описания (PDF) - RF Micro Devices

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RF2968

BLUETOOTH™ TRANSCEIVER

RF Micro Devices 

RF2968

Preliminary

Application Information

Baseband Interface

The RF2968 RF transceiver serves as the physical layer (PHY) in a Bluetooth system and supports the BlueRF interface

between PHY and baseband devices. The RF2968 contains the data demodulation, DC compensation, and data and

clock extraction circuitry while the access code correlator function takes place in the baseband.

There are two interfaces between the RF2968 and the baseband. The serial interface provides the path for control data

exchange, and the bidirectional interface provides the path for modem, timing, and chip power control signals. Figure 1

shows bidirectional signals with arrowheads on both ends of the line.

BDATA1

BPKTCTL

BXTLEN

BRCLK

BnPWR

BDDATA

BDCLK

BnDEN

Figure1. Baseband/RF2968 Interface

11

Serial Interface

Control data is exchanged between the RF2968 and the baseband by means of the DBus serial interface protocol.

BDCLK, BDDATA, and BnDEN are the signals comprising the serial interface. The baseband is the master device, initi-

ating all accesses to the RF2968 registers. The data registers of the RF2968 are programmed or recalled according to

the specified command format and address assignments. Data packets are transmitted MSB first.

Serial Data Packet Format

Field

Device Address

Read/Write

Register Address

Data

Number of Bits

3 [A7:A5]

1 [R/W]

5 [A4:A0]

16 [D15:D0]

Comments

“101” for PHY

“1”=Read, “0”=Write

Maximum of 32 registers

The RF2968 is programmed in Write mode and returns its register contents

in Read mode.

During a write, the baseband drives out each bit of the packet on the falling edge of BDCLK. The RF2968’s data register

is updated with the shift register contents on the first falling edge of BDCLK after BnDEN is driven high. See Figure 2.

BDCLK

BDDATA

BnDEN

A7

A6 A5

...

A4

A3

A2

A1

... A0 D15 D14

D2

D1

D0

don't

care

A7

A6

R/W= write = 0

Figure 2. DBus Write Programming Diagram

11-128

Rev A13 010912

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