TLK2500IRCP

1.6 Gbps to 2.5 Gbps TRANSCEIVER

SLLS356B – JUNE 1999 – REVISED JANUARY 2000

11

POST OFFICE BOX 655303

Terminal Functions(Continued)

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

RX_ER/

PRBS_PASS

29

Output

(3-state on

powerup)

Receive error. Controlled by PRBSEN pin. When PRBSEN= low then pin is used to indicate receive

error (RX_ER). When PRBSEN is high then pin indicates status of the PRBS test results (High=pass).

RX_ER is in a high-impedance state during power-on reset.

When RX_ER and RX_DV are asserted, indicates that an error was detected somewhere in the frame

presently being transferred from the PHY. When RX_ER is asserted and RX_DV is deasserted,

indicates that carrier extend data is being presented.

RX_DV

30

Output

3-state on

power up

Receive data valid. RX_DV is driven by the PHY to indicate that the PHY is presenting recovered and

decoded data on RXD. RX_DV shall be asserted continuously from the first recovered doublet of the

frame through the final recovered doublet and shall be negated prior to the first rising edge of RX_CLK

that follows the final doublet. RX_DV is in a high-impedance state during power-on reset.

TESTEN

27

Input (with

pulldown)

Test mode enable, should be tied low.

TXD0

TXD1

TXD2

TXD3

TXD4

TXD5

TXD6

TXD7

TXD8

TXD9

TXD10

TXD11

TXD12

TXD13

TXD14

TXD15

62

63

64

2

3

4

6

7

10

11

12

14

15

16

17

19

Input

Transmit data. These inputs carry the 16-bit parallel data output from a protocol device to the transceiver

for encoding, serialization and transmission. This 16-bit parallel data is clocked into the transceiver on

the rising edge of GTX_CLK.

TX_EN

20

Input ( with

pulldown)

Transmit enable. TX_EN in combination with TX_ER indicates the controller is presenting data on the

parallel for transmission. TX_EN shall be high with the first doublet of the preamble and remain asserted

while all doublet to be transmitted are presented. TX_EN shall be negated prior to the first rising edge of

GTX_CLK following the final doublet of a frame.

TX_ER

22

Input (with

pulldown)

Transmit error coding. When TX_ER and TX_EN are high, indicates that the PHY will generate an error

somewhere in the frame presently being transferred. When TX_ER is asserted and TX_EN is

deasserted, indicates the controller is presenting carrier extension data. When TX_ER is deasserted

with TX_EN asserted, indicates that normal data is being presented.

VDD

1,9,23,

38,48

Supply

Digital logic power. Provides power for all digital circuitry and digital I/O buffers.

VDDA

55,57

Supply

Analog power. VDDA provides a supply reference for the high-speed analog circuits, receiver and

transmitter