CS22220 datasheet(12/34 Pages) CIRRUS

12 / 34 page

CS22220 Wireless PCMCIA Controller

12 of 34

DS557PP2

Rev. 3.0

www.cirrus.com

TXPEBB

Output

Baseband transmit power enable, an output from the MAC to the radio

baseband processor. When active, the baseband processor transmitter is

configured to be operational, otherwise the transmitter is in standby

mode.

TXD

Output

It is the serial data output from the MAC to the radio baseband processor.

The data is transmitted serially with the LSB first. The data is driven by

the MAC on the rising edge of TXCLK and is sampled by the radio

baseband processor on the falling or rising edge of TXCLK depending on

baseband requirements.

TXRDY

Input

Transmit data ready is an input to the MAC from the radio baseband

processor to indicate that the radio baseband processor is ready to

receive the data packet over the TXD signal. The signal is sampled by the

MAC on the rising edge of TXCLK.

CCA

Input

Clear channel assessment is an input from the radio baseband processor

to signal that the channel is clear to transmit. When this signal is a 0, the

channel is clear to transmit. When this signal is a 1, the channel is not

clear to transmit. This helps the MAC to determine when to switch from

receive to transmit mode.

BBRNW

Output

Baseband read/write is an output from the MAC to indicate the direction

of the SD bus when used for reading or writing data. This signal has to be

setup to the rising edge of BBSCLK for the baseband processor and is

driven on the rising edge of the ARMCLK corresponding the falling edge

of BBSCLK.

nRESETBB

Output

Baseband reset is an output of the MAC to reset the baseband processor.

BBAS

Output

Baseband address strobe is used to envelop the address or the data on

the BBSDX bus. A logic 1 envelops the address and a logic 0 envelops

the data. This signal has to be setup to the rising edge of BBSCLK for the

baseband processor and is driven on the falling edge of BBSCLK.

nBBCS

Output

Baseband chip select is an active low output to activate the serial control

port. When inactive the SD, BBSCLK, BBAS and BBRNW signals are

‘don’t cares’.

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