DS80PCI810 Datasheet, PDF (14/60 Pages) Texas Instruments – Low-Power 8 Gbps 8-Channel Linear Repeater

DS80PCI810
SNLS493A – OCTOBER 2014 – REVISED JANUARY 2015
7 Detailed Description
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7.1 Overview
The DS80PCI810 provides linear equalization for lossy printed circuit board backplanes and balanced cables.
The DS80PCI810 operates in three modes: Pin Control Mode (ENSMB = 0), SMBus Slave Mode (ENSMB = 1),
and SMBus Master Mode (ENSMB = Float) to load register information from external EEPROM.
7.2 Functional Block Diagram
One channel of four A Channels
RXDET
Term
INA_n+
INA_n-
EN_SMB
EQA
VODA[1:0]
OUTA_n+
EQ
Driver
OUTA_n-
READ_EN
AD[3:0]
SCL
SDA
PWDN
VDD_SEL
VIN
RXDET
Digital Core and SMBus Registers
Term
INB_n+
EQ
INB_n-
EN_SMB
EQB
VODB[1:0]
One channel of four B Channels
Internal voltage
regulator
Driver
ALL_DONE
OUTB_n+
OUTB_n-
7.2.1 Functional Datapath Blocks
In an increasing number of high speed applications, transparency between Tx and Rx endpoints is essential to
ensure high signal integrity. The DS80PCI810 channel datapath uses one gain stage input equalization coupled
with a linear output driver. This combination provides a high level of transparency, thereby achieving greater
drive distance in PCIe applications where Rx-Tx auto-negotiation and link-training are required. Refer to the
Typical Applications section for more application information regarding recommended settings and placement.
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