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

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ID 683136
Date 7/15/2021
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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

Output and Output Enable Paths

The output delay element sends data to the pad through the output buffer.

Each output path contains two stages of DDIOs, which are half-rate and full-rate.

Figure 4. Simplified View of Single-Ended GPIO Output Path


Figure 5. Output Path Waveform in DDIO Mode with Half-Rate Conversion
Figure 6.  Simplified View of Output Enable Path


The difference between the output path and output enable (OE) path is that the OE path does not contain full-rate DDIO. To support packed-register implementations in the OE path, a simple register operates as full-rate DDIO. For the same reason, only one half-rate DDIO is present.

The OE path operates in the following three fundamental modes:

  • Bypass—the core sends data directly to the delay element, bypassing all DDIOs.
  • Packed Register—bypasses half-rate DDIO.
  • SDR output at half-rate—half-rate DDIOs convert data from full-rate to half-rate.
Note: The GPIO IP core does not support dynamic calibration of bidirectional pins. For applications that require dynamic calibration of bidirectional pins, refer to the related information.
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