DK-DEV-4SGX230N Altera, DK-DEV-4SGX230N Datasheet - Page 494

• Manufacturer Part Number: DK-DEV-4SGX230N
• Description: KIT DEVELOPMENT STRATIX IV
• Manufacturer: Altera
• Series: Stratix® IVr
• Type: FPGAr

Specifications of DK-DEV-4SGX230N

• Contents: Development Board, Universal Power Supply, Cables and Software
• Silicon Manufacturer: Altera
• Core Architecture: FPGA
• Core Sub-architecture: Stratix
• Silicon Core Number: EP4S
• Silicon Family Name: Stratix IV GX
• Rohs Compliant: Yes
• For Use With/related Products: EP4SGX230K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 544-2594

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Stratix IV Device Handbook Volume 2: Transceivers
1
Adaptive Equalization (AEQ)
Stratix IV GX and GT receivers offer an Adaptive Equalization feature that
automatically compensates for losses on the receiver channels. High-speed interface
systems are used at different data rates with multiple backplane environments. These
systems require different equalization settings to compensate for changing data rates
and back plane characteristics. Manually selecting optimal equalization settings is
cumbersome under these changing system characteristics. The Adaptive Equalization
feature solves this problem by enabling the Stratix IV device to continuously tune the
receiver equalization settings based on the frequency content of the incoming signal
and comparing it with internally generated reference signals.
Without this feature, you would have to tune the receiver channel’s equalization
stages manually, finding the optimal settings through trial and error, then locking in
those values at compile time.
The AEQ block resides within the PMA of the receiver channel and is available on the
four regular channels of a transceiver block. To use AEQ, you must first enable the
AEQ hardware in the ALTGX MegaWizard Plug-In Manager and the AEQ control
block in the ALTGX_RECONFIG MegaWizard Plug-In Manager.
To enable the AEQ feature, in ALTGX and ALTGX_RECONFIG MegaWizard Plug-In
Managers, select the Enable adaptive equalizer control option.
When you select AEQ, two ports, aeq_fromgxb[] and aeq_togxb[], become available
on the ALTGX and ALTGX_RECONFIG instances. These ports provide an interface
between the PMA of the receiver channel and the AEQ control block in the
ALTGX_RECONFIG MegaWizard Plug-In Manager.
AEQ hardware is not present in the CMU channels.
Chapter 1: Transceiver Architecture in Stratix IV Devices
February 2011 Altera Corporation
Transceiver Block Architecture