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1. Intel® MAX® 10 I/O Overview 2. Intel® MAX® 10 I/O Architecture and Features 3. Intel® MAX® 10 I/O Design Considerations 4. Intel® MAX® 10 I/O Implementation Guides 5. GPIO Lite Intel® FPGA IP References 6. Intel® MAX® 10 General Purpose I/O User Guide Archives 7. Document Revision History for Intel® MAX® 10 General Purpose I/O User Guide
220.127.116.11. Programmable Open Drain 18.104.22.168. Programmable Bus Hold 22.214.171.124. Programmable Pull-Up Resistor 126.96.36.199. Programmable Current Strength 188.8.131.52. Programmable Output Slew Rate Control 184.108.40.206. Programmable IOE Delay 220.127.116.11. PCI Clamp Diode 18.104.22.168. Programmable Pre-Emphasis 22.214.171.124. Programmable Differential Output Voltage 126.96.36.199. Programmable Emulated Differential Output 188.8.131.52. Programmable Dynamic Power Down
3.1. Guidelines: VCCIO Range Considerations 3.2. Guidelines: Voltage-Referenced I/O Standards Restriction 3.3. Guidelines: Enable Clamp Diode for LVTTL/LVCMOS Input Buffers 3.4. Guidelines: Adhere to the LVDS I/O Restrictions Rules 3.5. Guidelines: I/O Restriction Rules 3.6. Guidelines: Placement Restrictions for 1.0 V I/O Pin 3.7. Guidelines: Analog-to-Digital Converter I/O Restriction 3.8. Guidelines: External Memory Interface I/O Restrictions 3.9. Guidelines: Dual-Purpose Configuration Pin 3.10. Guidelines: Clock and Data Input Signal for Intel® MAX® 10 E144 Package
184.108.40.206. Programmable Pre-Emphasis
The differential output voltage (VOD) setting and the output impedance of the driver set the output current limit of a high-speed transmission signal. At a high frequency, the slew rate may not be fast enough to reach the full VOD level before the next edge, producing pattern-dependent jitter. Pre-emphasis momentarily boosts the output current during switching to increase the output slew rate.
Pre-emphasis increases the amplitude of the high-frequency component of the output signal. This increase compensates for the frequency-dependent attenuation along the transmission line.
The overshoot introduced by the extra current occurs only during change of state switching. This overshoot increases the output slew rate but does not ring, unlike the overshoot caused by signal reflection. The amount of pre-emphasis required depends on the attenuation of the high-frequency component along the transmission line.
Figure 7. LVDS Output with Programmable Pre-Emphasis
|Assignment name||Programmable Pre-emphasis|
|Allowed values||0 (disabled), 1 (enabled). Default is 1.|
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