GPIO Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices

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ID 683136
Date 1/25/2022
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Document Table of Contents x
GPIO Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices
GPIO Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices x
Release Information for GPIO Intel® FPGA IP GPIO Intel® FPGA IP Features GPIO Intel® FPGA IP Data Paths GPIO Intel® FPGA IP Interface Signals Verifying Resource Utilization and Design Performance GPIO Intel® FPGA IP Parameter Settings Register Packing GPIO Intel® FPGA IP Timing GPIO Intel® FPGA IP Design Examples IP Migration Flow for Arria® V, Cyclone® V, and Stratix® V Devices GPIO Intel® FPGA IP User Guide Archives Document Revision History for GPIO Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices
GPIO Intel® FPGA IP Data Paths x
Input Path Output and Output Enable Paths
GPIO Intel® FPGA IP Interface Signals x
Shared Signals Data Bit-Order for Data Interface Input and Output Bus High and Low Bits Data Interface Signals and Corresponding Clocks
GPIO Intel® FPGA IP Timing x
Timing Components Delay Elements Timing Analysis Timing Closure Guidelines
Timing Analysis x
Single Data Rate Input Register Full-Rate or Half-Rate DDIO Input Register Single Data Rate Output Register Full-Rate or Half-Rate DDIO Output Register
GPIO Intel® FPGA IP Design Examples x
GPIO IP Core Synthesizable Intel® Quartus® Prime Design Example GPIO IP Core Simulation Design Example
IP Migration Flow for Arria® V, Cyclone® V, and Stratix® V Devices x
Migrating Your ALTDDIO_IN, ALTDDIO_OUT, ALTDDIO_BIDIR, and ALTIOBUF IP Cores Guideline: Swap datain_h and datain_l Ports in Migrated IP
GPIO Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices

Timing Closure Guidelines

For the GPIO input registers, the input I/O transfer is likely to fail the hold time if you do not set the input delay chain. This failure is caused by the clock delay being larger than the data delay.

To meet the hold time, add delay to the input data path using the input delay chain. In general, the input delay chain is around 60 ps per step at the –1 speed grade. To get an approximate input delay chain setting to pass the timing, divide the negative hold slack by 60 ps.

However, if the I/O PLL drives the clocks of the GPIO input registers (simple register or DDIO mode), you can set the compensation mode to source synchronous mode. The Fitter will attempt to configure the I/O PLL for a better setup and hold slack for the input I/O timing analysis.

For the GPIO output and output enable registers, you can add delay to the output data and clock using the output and output enable delay chains.

  • If you observe setup time violation, you can increase the output clock delay chain setting.
  • If you observe hold time violation, you can increase the output data delay chain setting.
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