Quartus® Prime Pro Edition User Guide: PCB Design Tools

ID 683768
Date 4/01/2024
Document Table of Contents Header Comment

The first block of an output simulation SPICE deck is the header comment. The purpose of this block is to provide a readable summary of how the simulation file has been automatically configured by the Quartus® Prime software.

This block has two main components:

  • The first component summarizes the I/O configuration relevant information such as device, speed grade, and so on.
  • The second component specifies the exact test condition that the Quartus® Prime software assumes when generating tCO delay numbers. This information is used as part of the double-counting correction circuitry contained in the simulation file.

The SPICE decks are preconfigured to calculate the slow process corner delay but can also be used to simulate the fast process corner as well. The fast corner conditions are listed in the header under the notes section.

The final section of the header comment lists any warning messages that you must consider when you use the SPICE decks.

 Header Comment Block

* Intel Quartus Prime HSPICE Writer I/O Simulation Deck
* This spice simulation deck was automatically generated by
* Intel Quartus Prime for the following IO settings:
* Device: EP2S60F1020C3
* Speed Grade: C3
* Pin: AA4 (out96)
* Bank: IO Bank 6 (Row I/O)
* I/O Standard: LVTTL, 12mA
* OCT: Off
* Quartus’ default I/O timing delays assume the following slow
* corner simulation conditions.
* Specified Test Conditions For Intel Quartus Prime Tco
* Temperature: 85C (Slowest Temperature Corner)
* Transistor Model: TT (Typical Transistor Corner)
* Vccn: 3.135V (Vccn_min = Nominal - 5%)
* Vccpd: 2.97V (Vccpd_min = Nominal - 10%)
* Load: No Load
* Vtt: 1.5675V (Voltage reference is Vccn/2)
* For C3 devices, the TT transistor corner provides an
* approximation for worst case timing. However, for functionality
* simulations, it is recommended that the SS corner be simulated
* as well.
* Note: The I/O transistors are specified to operate at least as
* fast as the TT transistor corner, actual production
* devices can be as fast as the FF corner. Any simulations
* for hold times should be conducted using the fast process
* corner with the following simulation conditions.
* Temperature: 0C (Fastest Commercial Temperature Corner **)
* Transistor Model: FF (Fastest Transistor Corner)
* Vccn: 1.98V (Vccn_hold = Nominal + 10%)
* Vccpd: 3.63V (Vccpd_hold = Nominal + 10%)
* Vtt: 0.95V (Vtt_hold = Vccn/2 - 40mV)
* Vcc: 1.25V (Vcc_hold = Maximum Recommended)
* Package Model: Short-circuit from pad to pin
* Warnings: