CS8952 datasheet(78/82 Pages) CIRRUS

78 / 82 page

CS8952

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

TXSLEW[1:0] - Transmit Slew Rate Control. Input, Pins 61 and 60.

These three-level pins allow adjustment to the rise and fall times of the 10BASE-TX transmitter output

waveform. The rise and fall times are symmetric.

Media Interface Pins

RX+, RX- - 10/100 Receive. Differential Input Pair, Pins 91 and 92.

Differential input pair receives 10 or 100 Mb/s data from the receive port of the transformer primary.

TX+, TX- - 10/100 Transmit. Differential Output Pair, Pins 80 and 81.

Differential output pair drives 10 or 100 Mb/s data to the transmit port of the transformer primary.

RX_NRZ+, RX_NRZ- - FX Receive. Differential Input Pair, Pins 6 and 7.

PECL output pair receives 100 Mb/s NRZI-encoded data from an external optical module.

SIGNAL+, SIGNAL- - Signal Detect. Differential Input Pair, Pins 9 and 8.

PECL input pair receives signal detection indication from an external optical module.

TX_NRZ+, TX_NRZ- - FX Transmit. Differential Output Pair, Pins 5 and 4.

PECL output pair drives 100 Mb/s NRZI-encoded data to an external optical module.

General Pins

CLK25- 25 MHzClock.Output,Pin 17.

A 25 MHz Clock is output on this pin when the CS8952 is configured to use an external reference

transmit clock in TX_CLK IN MASTER mode. See the pin description for the Transmit Clock Mode

Initialization pin (TCM) for more information on TX_CLK operating modes.

CLK25 may also be enabled regardless of the TCM pin state by clearing bit 7 of the PCS Sub-layer

Configuration Register (address 17h).

RES - Reference Resistor. Input, Pin 86.

This input should be connected to ground with a 4.99 k

Ω +/-1% series resistor. The resistor is needed

for the biasing of internal analog circuits.

TXSLEW0 pin

TXSLEW1 mode

Rise/Fall time

low

0.5 ns

low

floating

1.0 ns

low

high

1.5 ns

floating

low

2.0 ns

floating

2.5 ns

floating

high

3.0 ns

high

low

3.5 ns

high

floating

4.0 ns

high

4.5 ns

CS8952 Datasheet(PDF) 78 Page - Cirrus Logic

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