CS22220 datasheet(13/34 Pages) CIRRUS

13 / 34 page

CS22220 Wireless PCMCIA Controller

13 of 34

DS557PP2

Rev. 3.0

www.cirrus.com

TXPAPE

Output

Radio power amplifier power enable is a software-controlled output. This

signal is used to gate power to the power amplifier.

TXPE

Output

Radio transmit power enable indicates if transmit mode is enabled. When

low, this signal indicates transmitter is in standby mode.

RXPEBB

Output

Baseband receive power enable is an output that indicates if the MAC is

in receive mode. Output to baseband processor enables receive mode in

baseband processor.

BBSCLK

Output

Baseband serial clock is a programmable output generated by dividing

ARM_CLK by 14 (default). This clock is used for the serial control port to

sample the control and data signals.

BBSDX

Bi-directional

Baseband serial data is a bi-directional serial data bus, which is used to

transfer address and data to/from the internal registers of the baseband

processor.

SYNTHLE

Output

Synthesizer latchenableis anactivehighsignalused tosend datatothe

synthesizer.

nRPD

Output

Radio power down enable.

This active low signal is used to power

management purpose for the radio circuitry.

RXCLK

Input

This is an input from the baseband processor. It is used to clock in

received data from baseband processor.

MDRDY

Input

Receive data ready is an input signal from the baseband processor,

indicating a data packet is ready to be transferred to the MAC. The signal

returns to an inactive state when there is no more receiver data or when

the link has been interrupted. This signal is sampled on the falling or

rising edge of RXCLK depending on baseband requirements.

RXD

Input

Receive data is an input from the baseband processor transferring

demodulated header information and data in a serial format. The data is

frame aligned with MD_RDY. This signal is sampled on the falling or

rising edge of RXCLK depending on baseband requirements.

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