TLK3118 Datasheet, PDF (5/57 Pages) Texas Instruments – Redundant XAUI Transceiver

www.ti.com
Parallel Data In
Parallel
to Serial
REFCLKP
/N
Multiplying
Clock
Synthesizer
Baud
Clock
TLK3118
Redundant XAUI Transceiver
SLLS628A – DECEMBER 2004 – REVISED APRIL 2005
DQ
TDP
TDN
RCLK
Interpolator
& Clock
Recovery
Recovered
Clock
Serial to
Parallel
Parallel Data Out
&
Comma
RDP
Detect
RDN
Figure 5. Block Diagram of SERDES Core
Detailed Description
The TLK3118 has two operational interface modes controlled by the state of pins A/B and RETIM. The RETIM
pin controls whether the TLK3118 operates as a re-timer and the A/B pin controls which is the active
bi-directional XAUI channel reflected on the bi-directional XGMII interface during transceiver mode operations.
Transceiver Operation (RETIM = LOW)
When RETIM is held low, the TLK3118 operates as a redundant XAUI transceiver. The device will serialize data
input on TXD (31:0) and output on the selected serial output signals. Serial data input on selected channel is
de-serialized, aligned and output on RXD (31:0) outputs. When A/B is asserted high, serial links RD [P/N]
[3/2/1/0]0 form the primary XAUI channel. Data input on TXD (31:0) is output on TD [P/N] [3/2/1/0]0 and serial
data input from RD [P/N] [3/2/1/0]0 is de-serialized, aligned and output on the RXD (31:0) outputs. When A/B is
asserted low, serial links RD [P/N] [3/2/1/0]1 form the primary XAUI channel. Data input on TXD(31:0) is
serialized and output on TD[P/N][3/2/1/0]1 and serial data input from the RD[P/N][3:0]1 is de-serialized, aligned
and output on the RXD(31:0) outputs.
While communication is occurring on the primary XAUI channel, the secondary XAUI channel is fully functional
capable of transmitting and receiving data. All registers are valid and accessible. The only difference between the
primary and secondary channels is the primary channel is routed to the XGMII bus. The TLK3118 transceiver
mode default condition will be to broadcast the data input on the XGMII inputs, TXD (31:0), to both the primary
and secondary XAUI channels. The receive path of the secondary XAUI channel will default to an active state
recovering and aligning data.
5