CS8952T datasheet(14/86 Pages) CIRRUS

14 / 86 page

DS206TPP2

CS8952T

CrystalLAN™ 100BASE-X and 10BASE-T Transceiver

CIRRUS LOGIC ADVANCED PRODUCT DATABOOK

PWRDN - Power Down. Input, Pin 64.

When this pin is asserted high, the CS8952T powers down all circuitry except that circuitry

needed to maintain the network line impedance. This is the lowest power mode possible. The

CS8952T will remain in low power mode until the PWRDN pin is deasserted.

A slightly higher power power-down mode may also be entered under software control through

bit 11 of the Basic Mode Control Register (address 00h).

REPEATER - REPEATER Mode Select. Input, Pin 16.

This pin controls the operation of the CRS (Carrier Sense) pin as shown below:

At power-up or at reset, the value on this pin is latched into bit 12 of the PCS Sub-Layer

Configuration Register (address 17h). This pin includes a weak internal pull-down (> 20 K

Ω),

or the value may be set by an external 4.7 K

Ω pull-up or pull-down resistor.

SPD10 - 10 Mb/s Speed Indication. Output, Pin 68.

This pin is asserted high when the CS8952T is configured for 10 Mb/s operation. This pin can

be used to drive a low-current LED to indicate 10 Mb/s operation.

SPD100 - 100 Mb/s Speed Indication. Output, Pin 67.

This pin is asserted high when the CS8952T is configured for 100 Mb/s operation. This pin can

be used to drive a low-current LED to indicate 100 Mb/s operation.

TCM - Transmit Clock Mode Initialization. Input, Pin 59.

The logic value on this three-level pin during power-up or reset determines whether TX_CLK

is used as an input or an output, and whether an external 25 MHz clock reference is provided

on the CLK25 output pin.

TEST[1:0] - Factory Test. Input, Pins 24 and 25.

These pins are for factory test only. They include weak internal pull-downs (> 20 K

Ω), and

should be tied directly to VSS for normal operation.

REPEATER pin

DUPLEX mode

CRS Indicates

high

don’t care

receive activity only

low

full duplex

receive activity only

low

half duplex

receive or transmit activity

TCM pin

TX_CLK mode

CLK25 status

high

TX_CLK is input

CLK25 pin is an output

floating

TX_CLK is input

CLK25 is disabled

low

TX_CLK is output

CLK25 is disabled

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