Preliminary Data Sheet

PT8R1002 CMOS Zero-IF

Radio Transceiver IC for Bluetooth

PT0124(12/04)

Ver:2

6

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The unidirectional mode allows the PT8R1002 to be controlled

with minimum reference to the previous state of the interface.

This allows the state of PT8R1002 to be inferred by examin-

ing the logic levels on the interface signals. The unidirec-

tional interface can be split into two subsections: RF data and

control path, register control interface. In BlueRF interface,

ten signals are used in the RF data and control path, and four in

the register control interface. All of the signals are unidirec-

tional. However, the BSEN (Hop frequency synthesizer en-

able) and BXTLEN (a strobe which enables the RF oscillator)

are not supported as explicit signal in the PT8R1002. Instead,

these equivalents functions can be supported using serial pro-

gramming through JTAG interface. The unidirectional inter-

face requires that the PT8R1002 control registers interface to

the Baseband via an IEEE 1149.1 JTAG interface. The unidi-

rectional interface requires that the Baseband portion of the

interface is referenced to a Baseband generated clock.

Figure 4. BlueRF RXMOD2 Unidirectional baseband interface

BRXD

RXDATA(GPA4)

BRXEN

RXACTIVE(GPA1)

BTXEN

TXACTIVE(GPA0)

BPKTCTL

SYNCDETECT(GPA5)

BSEN

GPD4(optional)

BXTLEN

GPD5(optional)

BTXD

TXDATA(GPA3)

BPAEN

TXDATA_EN(GPA2)

BnPWR

RFRESET(GPA7)

BRCLK

DATACLK(GPA6)

BDCLK

BLUERF_TCK(GPA8)

BnDEN

BLUERF_TMS(GPA9)

BMOSI

BLUERF_TDI(GPA10)

BMISO

BLUERF_TDO(GPA11)

Bluetooth

Radio

Transceiver

Baseband

Interface

(Unidirectional,

JTAG SPI)

Bidirectional interface

The bidirectional mode provides the lowest pin count inter-

face between the baseband and RF piece. The interface con-

nections for bidirectional mode are shown as follows:

As similar to unidirectional interface, the bidirectional inter-

face can be split into two subsections: RF data and control

path, register control interface. The bidirectional interface uses

a DBus control register interface. In BlueRF interface, five

signals are used in the RF data and control path, and three in

the register control interface. There are two bidirectional sig-

nals such as BTXD and BDDATA. The direction of the two

bidirectional pads (BTXD, BDDATA) is controlled by separate

state machine in the baseband and PT8R1002. The baseband

state machine is the master and controls the state machine in

the PT8R1002 in an open loop manner. To prevent bidirec-

tional data contention, baseband must ensure not to occur

during reset and normal operation.