RF3000 データシートの表示（PDF） - RF Micro Devices

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RF3000

SPREAD-SPECTRUM BASEBAND MODEM

RF Micro Devices 

RF3000

IEEE802.11b DSSS Receive Summary

1. Drive RXPE High.

2. RF3000 looks for incoming valid Barker Code.

3. RF3000 sets ACQ bit in Register 0x01.

4. When the Start Frame Delimiter is identified, the RF3000 sets the SFD bit in Register 0x01.

5. RF3000 Extracts Header information.

This information is copied into the RF3000 RX Status, Service fields and presented on the RXDATA Pin with Clocks on

DATA CLK.

6. This will be followed by 16 bit times of no clock transitions.

7. RF3000 Drives RXRDY high, and clocks Received Data on the rising edge of DATA CLK.

8. RF3000 Drives RXRDY low at the end of the data packet.

RXPE

RXRDY

DATACLK

RXDATA

32CLK

Cycles

Header

Data

Preamble and

Header

Extraction

Data

Rate Determined from Received IEEE802.11 Signal Field

Figure 13. IEEE802.11b Receive Timing Overview

The RF3000 has provision for an alternate Receive Data port interface. In the receiver interface, the DATACLK is

inverted, and an extra clock is asserted after RXRDY goes 'low' indicating the end of the received packet, see Figure

13a. The alternate Transmit interface is enabled by writing 0x08 into RF3000 Register 0x1C.

RXPE

RXRDY

DATACLK

RXDATA

32CLK

Cycles

Header

Data

Preamble and

Header

Extraction

Figure 13a. Alternate Receiver Interface

Data

Rate Determined from Received IEEE802.11 Signal Field

Rev A4 031216

11-337

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