DS80PCI402 Datasheet, PDF (1/39 Pages) Texas Instruments – 2.5 Gbps / 5.0 Gbps / 8.0 Gbps 4 Lane PCI Express Repeater with Equalization and De-Emphasis

DS80PCI402
March 22, 2012
2.5 Gbps / 5.0 Gbps / 8.0 Gbps 4 Lane PCI Express
Repeater with Equalization and De-Emphasis
General Description
The DS80PCI402 is a low power, 4 lane repeater with 4-stage
input equalization, and output de-emphasis driver to enhance
the reach of PCI express serial links in board-to-board or ca-
ble interconnects. Ideal for x4 (or lower) PCI express config-
uration, the DS80PCI402 automatically detects and adapts to
Gen-1, Gen-2 and Gen-3 data rates for easy system upgrade.
Each channel supports seamless detection and management
of the new Gen-3 transmit equalizer coefficients (FIR tap)
handshake protocol and PCIe control signals such as transmit
idle, beacon etc. without external system intervention. An au-
tomatic receive detection circuitry controls the input termina-
tion impedance based upon endpoint insertion (hot-plug
events). These features guarantee PCIe interoperability at
both the electrical and system level, while reducing design
complexity.
Powered by National’s SiGe BiCMOS process, DS80PCI402
offers programmable transmit de-emphasis (up to 12 dB),
transmit VoD (up to 1300 mVp-p) and receive equalization (up
to 36 dB) to enable longer distance transmission in lossy cop-
per cables (10m+), or backplanes (40”+) with multiple con-
nectors. The receiver is capable of opening an input eye that
is completely closed due to inter-symbol interference (ISI) in-
troduced by the interconnect medium.
The programmable settings can be applied easily via pins,
software (SMBus/I2C) or loaded via an external EEPROM.
When operating in the EEPROM mode, the configuration in-
formation is automatically loaded on power up, which elimi-
nates the need for an external microprocessor or software
driver.
With a low power consumption and control to turn-off unused
channels, the DS80PCI402 is part of PowerWise family of
energy efficient devices.
Features
■ ^{Comprehensive family, proven system inter-operability}
DS80PCI102 : x1 PCIe Gen-1/2/3
DS80PCI402 : x4 PCIe Gen-1/2/3
DS80PCI800 : x8/x16 PCIe Gen-1/2/3
■ ^{Automatic rate detect and adaptation to Gen-1/2/3 speeds}
■ ^{Seamless support for Gen-3 transmit FIR handshake}
■ ^{Rate adaptive receive EQ (up to 36 dB), transmit}
deemphasis (up to 12 dB) only Gen-1/2
■ ^{Adjustable Transmit VOD: 0.8 to 1.3 Vp-p (pin mode)}
■ ^{0.2 UI of residual deterministic jitter at 8 Gbps after 40” of}
FR4 or 10m 30awg PCIe Cable
■ ^{Low power dissipation with ability to turnoff unused}
channels: 65 mW/channel
■ ^{Automatic receiver detect (hot-plug)}
■ ^{Multiple configuration modes: Pins/SMbus/Direct-}
EEPROM load
■ ^{Flow-thru pinout: 54-pin LLP (10 mm x 5.5 mm, 0.5 mm}
pitch)
■ ^{Single supply voltage: 2.5V or 3.3V (selectable)}
■ ^{5 kV HBM ESD rating}
■ ^{−40 to 85°C operating temperature range}
Typical Application
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