Datasheet

Next 10-Bit Code

TXP, TXN

TD(0−9)

REFCLK

d(Tx

latency)

10-Bit Code

b9b8b7 b0 b1 b2 b3

Measured 10-Bits

d(S)

d(H)

K28.5 DXX.X DXX.X DXX.X K28.5 DXX.X

RBC0

RBC1

SYNC

RD(0-9)

TLK1211RCP

SLLS658D – SEPTEMBER 2006– REVISED APRIL 2011

www.ti.com

Figure 1. Transmitter Latency Full Rate Mode

Data Reception

The receiver portion deserializes the differential serial data. The serial data is retimed based on an interpolated

clock generated from the reference clock. The serial data is then aligned to the 10-bit word boundaries and

presented to the protocol controller along with receive byte clocks (RBC0 and RBC1).

Receiver Clock Select Mode

There are two modes of operation for the parallel bus: 1) the 10-bit (TBI) mode and 2) 5-bit (DDR) mode. When

in TBI mode, there are two user-selectable clock modes that are controlled by the RBCMODE terminal: 1)

full-rate clock on RBC0 and 2) half-rate clocks on RBC0 and RBC1. When in the DDR mode, only a full-rate

clock is available on RBC0; see Table 2.

Table 2. Mode Selection

RECEIVE BYTE

MODESEL RBCMODE MODE

CLOCK

0 0 TBI half-rate 30–65 MHz

0 1 TBI full-rate 60–130 MHz

1 0 DDR 60–130 MHz

1 1 DDR 60–130 MHz

In the half-rate mode, two receive byte clocks (RBC0 and RBC1) are 180 degrees out of phase and operate at

one-half the data rate. The clocks are generated by dividing down the recovered clock. The received data is

output with respect to the two receive byte clocks (RBC0 and RBC1) allowing a protocol device to clock the

parallel bytes using the RBC0 and RBC1 rising edges. The outputs to the protocol device, byte 0 of the received

data is valid on the rising edge of RBC1. See the timing diagram shown in Figure 2.

Figure 2. Synchronous Timing Characteristics Waveforms (TBI Half-Rate Mode)

In the normal-rate mode, only RBC0 is used and operates at full data rate (that is, 1.25-Gbps data rate produces

a 125-MHz clock). The received data is output with respect to the rising edge of RBC0. RBC1 is low in this

mode. See the timing diagram shown in Figure 3.

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