AM79C930VCW datasheet(40/161 Pages) AMD

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P R E L I M I N A R Y

Am79C930

Pin 126:

TXCMD

The

TXCMD pin may be configured to drive a trans-

ceiver control reference signal, using one of two timing

sources plus input from the TXCMD bit of TIR11

(TIR11[0]), according to the following table:

RCEN

TXCMD Pin

TIR11[3]

Direction

Value

O_TX

TIR11[0] & T1

Transmit state machine generated signals

T1, T2, T3,

TXP

_ON and O_TX have the timing indicated in the

diagram in section

Am79C930-Based TX Power

Ramp Control.

Pin 129:

TXPE

The

TXPE pin may be configured to drive a transceiver

control reference signal, using one of two timing sources

plus input from the TXPE bit of TIR11 (TIR11[1]) and

the TXPEPOL bit of TCR27, according to the

following table:

Transmit state machine generated signals

T1, T2, T3,

TXP

_ON and O_TX have the timing indicated in the

diagram in section

Am79C930-Based TX Power

Ramp Control.

RCEN

TXPEPOL

TXPE Pin

TIR11[3]

TCR27[1]

Direction

Value

TXP_ON

TIR11[1] & T2

(& = logical ‘AND’)

TIR11[1] + T2

(+ = logical ‘OR’)

Pin 131:

TXMOD

The

TXMOD pin may be configured to drive a trans-

ceiver control reference signal, using input from the

TXMOD bit of TIR11 (TIR11[2]) and the TXMODPOL bit

of TCR27, according to the following table:

Transmit state machine generated signals

T1, T2, T3,

TXP

_ON and O_TX have the timing indicated in the

diagram in section

Am79C930-Based TX Power

Ramp Control.

RCEN

TXMODPOL

TXMOD Pin

TIR11[3]

TCR27[0]

Direction

Value

TIR11[2] & T3

(& = logical ‘AND’)

TIR11[2] + T3

(+ = logical ‘OR’)

Pin 132: ANTSLT

The ANTSLT pin may be configured to drive an inter-

nally generated antenna selection signal using the inter-

nal antenna diversity circuitry, or it may be controlled by

a register bit. Pin functionality is programmed according

to the following table:

If it is necessary to force ANTSLT to be always constant,

then program ANTS to 0 or user

ANTSLT pin, which can

be controlled by ANTSLTD (TCR7:[1]).

ANTSEN

ANTEN

Mode

(TIR16[[3])

(TIR4:[7])

ANTSLT <= low

ANTSEL <= ANTS (TIR26:[4])

ANTSLT <= internal ANTSEL

ANTSLT <= low

Pin 141:

ANTSLT/LA23

The

ANTSLT/LA23 pin may be configured to operate as

input or output and may be configured to drive an

internally generated antenna selection reference signal

using the internal antenna diversity circuitry. Note that

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