AM79C930 datasheet(41/161 Pages) AMD

41 / 161 page

P R E L I M I N A R Y

AMD

Am79C930

some functionality is only available in PCMCIA mode.

Pin functionality is programmed according to the follow-

ing table:

Note that a read of the ANTSLTD bit (TCR7[1]) will al-

ways give the current

ANTSLT/LA23 pin value without

inversion, regardless of pin configuration setting.

ANTSLT/

PCMCIA

ANTSEN

ANSLTLFN

ANTSLTLEN

LA23 Pin

Pin Value

TIR26[3]

TCR30[7]

TCR15[7]

Direction

Value

(LA23 input function)

ANTSLT

(from internal antenna)

(diversity circuit)

TCR7[1]

TIR26[4] (write)

TIR26[5] (read)

Pin 142: TXCMD/LA21

The TXCMD/LA21 pin may be configured to operate as

input or output and 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]). Note that some functionality is only available

in PCMCIA mode.

Pin functionality is programmed 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.

Note that a read of the TXCMDT bit (TCR7[2]) will al-

ways give the current TXCMD/LA21 pin value without

inversion, regardless of pin configuration setting.

TXCMD/

PCMCIA

RCEN

TXCMFN

TXCMEN

LA21 Pin

Pin Value

TIR11[3]

TCR30[5]

TCR15[5]

Direction

Value

(LA21 input function)

O_TX

TIR11[0] + T1

TCR7[2]

Pin 143:

TXDATA/LA20

The

TXDATA/LA20 pin may be configured to operate as

input or output and may be configured to drive inverted

transmit data. Note that some functionality is only

available in PCMCIA mode. Pin functionality is pro-

grammed according to the following table:

The

TXDATA signal is the inverse of the TXDATA signal

which is the TX data drawn from the TX FIFO using the

internal TX state machine control.

Note that a read of the TXDATALD bit (TCR7[0]) will al-

ways give the current

TXDATA/LA20 pin value without

inversion, regardless of pin configuration setting.

TXDATA/

PCMCIA

TXDLFN

TXDLEN

LA20 Pin

Pin Value

TCR30[6]

TCR15[6]

Direction

Value

(LA20 input function)

TXDATA

(from internal TX FIFO

using internal TX state machine timing)

TCR7[0]

Pin 144: LLOCKE/SA15

The LLOCKE/SA15 pin may be configured to operate as

input or output. Note that some functionality is only avail-

able in PCMCIA mode. Pin functionality is programmed

according to the following table:

Note that a read of the LLOCKE bit (TIR11[4]) will al-

ways give the current LLOCKE/SA15 pin value without

inversion, regardless of pin configuration setting.

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