MSM7712 データシートの表示（PDF） - Oki Electric Industry

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MSM7712

Wireless LAN Baseband Controller

Oki Electric Industry 

s MSM7712 s –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––

Radio Interface

The radio interface supports simple, flexible control of the radio and its synthesizer. The control signal

timing is programmable by the processor. Figure 4 shows the connection to a typical radio architecture.

Radio

LNA

Disc

+

-

CSN

DAC D

1LO

2LO

PA

DAC

MSM7712

RADPWR

RXC1

SLICE

RXD

RSSITH

DACEN

SYNCLK

SYNDAT

SYNLEN

LKDET

IFD[5:0]

TXC1

TXC2

ANT

Figure 4. Typical FH Radio Interface

Radio Interface Signal Descriptions

Pin Name

RXC1

TXC, TXC2

RADPWR

ANT

SLICE

Direction

Open-collector/drain Output

Open-collector/drain Output

Open-collector/drain output

Open-collector output

Open-collector/drain output

Description

When asserted reception is enabled. RXC1 is always asserted during reception. This signal is

programmable to be open-collector (active low) or open-drain (active high).

When asserted transmission is enabled. Both signals are programmable to be open-collector

(active low) or open-drain (active high). Transmit is only activated following a receive (where

Clear Channel Assessment is performed). The timing of TXC1 and TXC2 at the start of a transmit

is programmable from the deassertion of RXC1. RXC2 is typically used for TX Power Amplifier

switching, and its assertion depends on the power control mode selected in the MSM7712.

This pin is asserted to power up the radio circuitry (i.e. local oscillators) for reception. The pin

is programmable to be open-collector (active low) or open-drain (active high).

This pin selects one of two antennas for transmission or reception.

This control pin determines the response time constant of an analog data slicer when using the

internal modem with an analog data slicer circuit (options MSEL-0 or 1). This pin is program-

mable to be open-collector (active low) or open-drain (active high). The pin is asserted when

CCA has determined a valid IEEE 802.11 GH signal (preamble is detected).

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Oki Semiconductor

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