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TLK2201

TLK2201I

ETHERNET TRANSCEIVERS

SLLS420F – JUNE 2000 – REVISED SEPTEMBER 2007

Terminal Functions (continued)

TERMINAL

I/O

DESCRIPTION

NAME

NO.

RBC0 RBC1

31 30

O

Receive byte clock. RBC0 and RBC1 are recovered clocks used for synchronizing the 10-bit output

data on RD0-RD9. The operation of these clocks is dependent upon the receive clock mode

selected. In the half-rate mode, the 10-bit output data words are valid on the rising edges of RBC0

and RBC1. These clocks are adjusted to half-word boundaries in conjunction with synchronous

detect. The clocks are always expanded during data realignment and never slivered or truncated.

RBC0 registers bytes 1 and 3 of received data. RBC1 registers bytes 0 and 2 of received data. In

the normal rate mode, only RBC0 is valid and operates at 1/10 the serial data rate. Data is aligned

to the rising edge. In the DDR mode, only RBC0 is valid and operates at 1/10 the serial data rate.

Data is aligned to both the rising and falling edges.

RBCMODE

32

I

Receive clock mode select. When RBCMODE and MODESEL are low, half-rate clocks are output on

RBC0 and RBC1. When MODESEL is low and RBCMODE is high, a full baud-rate clock is output on

RBC0 and RBC1 is held low. When MODESEL is high, RBCMODE is ignored and a full baud-rate

clock is output on RBC0 and RBC1 is held low.

SYNCEN

24

I

Synchronous function enable. When SYNCEN is high, the internal synchronization function is

activated. When this function is activated, the transceiver detects the K28.5 comma character

(0011111 negative beginning disparity) in the serial data stream and realigns data on byte

boundaries if required. When SYNCEN is low, serial input data is unframed in RD0 - RD9.

SYNC/PASS

47

O

Synchronous detect. The SYNC output is asserted high upon detection of the comma pattern in the

serial data path. SYNC pulses are output only when SYNCEN is activated (asserted high). In PRBS

test mode (PRBSEN=high), SYNC/PASS outputs the status of the PRBS test results (high=pass).

LOS

26

O

Loss of signal. Indicates a loss of signal on the high-speed differential inputs RXP and RXN. If

magnitude of RXP-RXN > 150 mV, LOS = 1, valid input signalIf magnitude of RXP-RXN < 150 mV

and > 50 mV, LOS is undefinedIf magnitude of RXP-RXN < 50 mV, LOS = 0, loss of signal

MODESEL

15

I

Mode select. This terminal selects between the 10-bit interface and a reduced 5-bit DDR interface.

When low the 10-bit interface (TBI) is selected. When pulled high, the 5-bit DDR mode is selected.

The default mode is the TBI.

TEST

LOOPEN

19

I

Loop enable. When LOOPEN is high (active), the internal loop-back path is activated. The

transmitted serial data is directly routed to the inputs of the receiver. This provides a self-test

capability in conjunction with the protocol device. The TXP and TXN outputs are held in a

high-impedance state during the loop-back test. LOOPEN is held low during standard operational

state with external serial outputs and inputs active.

TCK

49

I

Test clock. IEEE1149.1 (JTAG)

JTDI

48

I

Test data input. IEEE1149.1 (JTAG)

JTDO

27

O

Test data output. IEEE1149.1 (JTAG)

JTRSTN

56

I

Reset signal. IEEE1149.1 (JTAG)

JTMS

55

I

Test mode select. IEEE1149.1 (JTAG)

ENABLE

28

I

When this terminal is low, the device is disabled for Iddq testing. RD0 - RD9, RBCn, TXP, and TXN

are high impedance. The pullup and pulldown resistors on any input are disabled. When ENABLE is

high, the device operates normally.

PRBSEN

16

I

PRBS enable. When PRBSEN is high, the PRBS generation circuitry is enabled. The PRBS

verification circuit in the receive side is also enabled. A PRBS signal can be fed to the receive inputs

and checked for errors, that are reported by the SYNC/PASS terminal indicating low.

TESTEN

17

I

Manufacturing test terminal

POWER

VDD

5, 10, 20,

Supply

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

23, 29, 37,

42, 50, 63

VDDA

53, 57, 59,

Supply

Analog power. VDDA provides power for the high-speed analog circuits, receiver, and transmitter

60

(1)

P/D = Internal pulldown

(2)

P/U = Internal pullup

(3)

P/D = Internal pulldown

(4)

P/U = Internal pullup

4

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