TLK2201A_16 Datasheet, PDF (6/20 Pages) Texas Instruments – ETHERNET TRANSCEIVERS

TLK2201A
TLK2201AI
SLLS572B – JUNE 2003 – REVISED SEPTEMBER 2007
www.ti.com
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, RBC1).
RECEIVER CLOCK SELECT MODE
There are two modes of operation for the parallel busses. 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 1.
MODESEL
0
0
1
1
Table 1. Mode Selection
RBCMODE
0
1
0
1
MODE
TBI half-rate
TBI full-rate
DDR
DDR
FREQUENCY
(TLK2201A)
100–125 MHz
100–160 MHz
100–125 MHz
100–125 MHz
FREQUENCY
(TLK2201AI)
120–125 MHz
120–160 MHz
120–125 MHz
120–125 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, 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
valid on the rising edge of RBC1. See the timing diagram shown in Figure 2.
RBC0
RBC1
SYNC
RD(0−9)
t_d(S)
t_d(S)
t_d(H)
t_d(H)
K28.5
DXX.X
DXX.X
DXX.X
K28.5
DXX.X
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 (i.e., 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.
RBC0
SYNC
t_d(S)
t_d(H)
RD(0−9)
K28.5
DXX.X
DXX.X
DXX.X
K28.5
DXX.X
Figure 3. Synchronous Timing Characteristics Waveforms (TBI full-rate mode)
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