DK-DEV-5SGXEA7N【PDF 312/527 页】KIT DEV STRATIX V FPGA 5SGXEA7

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Continuous Time Linear Equalization (CTLE)

SV52002

2014.01.07

Continuous Time Linear Equalization (CTLE)

Each receiver buffer has five independently programmable equalization circuits that boost the high-frequency

gain of the incoming signal, thereby compensating for the low-pass characteristics of the physical medium.

For Stratix V GX channels, the equalization circuitry provides up to 16 dB of high-frequency boost. For

Stratix V GT channels, the equalization circuitry provides up to 15 dB of high-frequency boost. The CTLE

operates in two modes: manual mode and adaptive equalization (AEQ) mode.

You can dynamically switch between these modes.

Note: The CTLE cannot be bypassed.

Manual Mode

Manual mode allows you to manually adjust the continuous time linear equalization to improve signal

integrity. You can statically set the equalizer settings in the IP or you can dynamically change the equalizer

settings with the reconfiguration controller IP.

Adaptive Equalization Mode

AEQ mode eliminates the need for manual tuning by enabling the Stratix V device to automatically tune

the receiver equalization settings based on the frequency content of the incoming signal and comparing that

with internally generated reference signals. The AEQ block resides within the PMA of the receiver channel

and is available on all GX channels.

Note: AEQ mode is not supported in GT channels.

There are two AEQ modes: one-time and powerdown:

? One-time mode — The AEQ finds a stable setting of the receiver equalizer and locks to that value. After

the stable setting is locked, the equalizer values do not change.

? Powerdown mode — The AEQ of the specific channel is placed in standby mode and the CTLE uses the

manually set value.

Related Information

? For more information about the CTLE specifications, refer to the Stratix V Device Datasheet .

? For more information about enabling different options and using them to control the AEQ hardware,

refer to the "Transceiver Reconfiguration Controller IP Core" chapter of the Altera Transceiver PHY

IP Core User Guide .

Decision Feedback Equalization

The decision feedback equalization (DFE) feature consists of a 5-tap equalizer, which boosts the high frequency

components of a signal without noise amplification by compensating for inter-symbol interference (ISI).

There are three DFE modes: manual, auto-adaptation, and triggered.

Note: The DFE is not supported in GT channels.

Related Information

For more information, refer to the "Transceiver Reconfiguration Controller IP Core" chapter of the

Altera Transceiver PHY IP Core User Guide .

Altera Corporation

Transceiver Architecture in Stratix V Devices

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