External Memory Interfaces Intel® Stratix® 10 FPGA IP User Guide

ID 683741
Date 3/11/2022
Public

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Document Table of Contents

11.1. Timing Closure

The following sections describe the timing analysis using the respective FPGA data sheet specifications and the user-specified memory data sheet parameters.
  • Core to core (C2C) transfers have timing constraint created and are analyzed by the Timing Analyzer. Core timing does not include user logic timing within core or to and from EMIF block. The EMIF IP provides the constrained clock to the customer logic.
  • Core to periphery (C2P) transfers have timing constraint created and are timing analyzed by the Timing Analyzer. Because of the increased number of C2P/P2C signals in 20nm families compared to previous families, more work is expected to ensure that these special timing arcs are properly modeled, both during timing analysis and compilation.
  • Periphery to core (P2C) transfers have timing constraint created and are timing analyzed by the Timing Analyzer. Because of the increased number of C2P/P2C signals in 20nm families compared to previous families, more work is expected to ensure that these special timing arcs are properly modeled, both during timing analysis and compilation.
  • Periphery to periphery (P2P) transfers are modeled entirely by a minimum pulse width violation on the hard block, and have no internal timing arc. P2P transfers are modeled only by a minimum pulse width violation on hardened block.

To account for the effects of calibration, the EMIF IP includes additional scripts that are part of the <phy_variation_name>_report_timing.tcl and <phy_variation_name>_ report_timing_core.tcl files that determine the timing margin after calibration. These scripts use the setup and hold slacks of individual pins to emulate what is occurring during calibration to obtain timing margins that are representative of calibrated PHYs. The effects considered as part of the calibrated timing analysis include improvements in margin because of calibration, and quantization error and calibration uncertainty because of voltage and temperature changes after calibration.

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