DS125DF1610 Datasheet, PDF (13/81 Pages) Texas Instruments – 9.8 to 12.5 Gbps 16-Channel Retimer

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7 Detailed Description
DS125DF1610
SNLS482A – APRIL 2014 – REVISED DECEMBER 2015
7.1 Overview
The DS125DF1610 is a multi-rate, 16-channel retimer with integrated 4x4 cross point switches and receiver AC
coupling capacitors. There is 1 cross point switch per 4 channels (quad). Each channel in the DS125DF1610
operates independently even if the cross point switch routing is enabled. All channels include a Continuous Time
Linear Equalizer (CTLE), Decision Feedback Equalizer (DFE), Variable Gain Amplifier (VGA), Clock and Data
Recovery circuit (CDR) and a differential driver with a 3-tap transmit Finite Impulse Response (FIR) filter. Each
channel also has its own Eye Opening Monitor (EOM) and configurable Pseudo-Random Bit Sequence (PRBS)
pattern checker and pattern generator that can be used for debug purposes.
The DS125DF1610 also supports JTAG boundary scan. The DS125DF1610 is configurable through a single
SMBus port. The DS125DF1610 can also act as an SMBus master to configure itself from an EEPROM.
The sections below describe the functionality of the various circuits and features within the DS125DF1610. For
more information about how to program or operate these features please consult the DS125DF1610
Programming Guide.
7.2 Functional Block Diagram
Quad 0 -- 1 of 4 Quads
RX_0A+
RX_0A-
EQ CrossPoint DFE
CDR
Driver
TX_0A+
TX_0A-
EQ
RX_0B+
RX_0B-
DFE
CDR
Driver
TX_0B+
TX_0B-
EQ
RX_1A+
RX_1A-
EQ
RX_1B+
RX_1B-
DFE
CDR
DFE
CDR
Driver
Driver
TX_1A+
TX_1A-
TX_1B+
TX_1B-
Figure 1. DS125DF1610 Simplified Cross Point Diagram
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