Chapter 2: Device Datasheet for Cyclone V Devices
2–35
I/O Timing
Remote System Upgrades Circuitry Timing Specification
Table 2–39 lists the timing parameter specifications for the remote system upgrade
circuitry.
Table 2–39. Remote System Upgrade Circuitry Timing Specification for Cyclone V Devices—
Preliminary
Parameter
Minimum
Maximum
Unit
(1)
(3)
—
40
MHz
tMAX_RU_CLK
(2)
tRU_nCONFIG
250
250
—
—
ns
ns
tRU_nRSTIMER
Notes to Table 2–39:
(1) This clock is user-supplied to the remote system upgrade circuitry. If you are using the ALTREMOTE_UPDATE
megafunction, the clock user-supplied to the ALTREMOTE_UPDATE megafunction must meet this specification.
(2) This is equivalent to strobing the reconfiguration input of the ALTREMOTE_UPDATE megafunction high for the
minimum timing specification. For more information, refer to “Remote System Upgrade State Machine” in the
Device Interfaces and Integration Basics for Cyclone V Devices chapter.
(3) This is equivalent to strobing the reset timer input of the ALTREMOTE_UPDATE megafunction high for the
minimum timing specification. For more information, refer to “User Watchdog Timer” in the Device Interfaces and
Integration Basics for Cyclone V Devices chapter.
User Watchdog Internal Oscillator Frequency Specification
Table 2–40 lists the frequency specifications for the user watchdog internal oscillator.
Table 2–40. User Watchdog Internal Oscillator Frequency Specifications for Cyclone V
Devices—Preliminary
Minimum
Typical
Maximum
Unit
5.3
7.9
12.5
MHz
I/O Timing
Altera offers two ways to determine I/O timing—the Excel-based I/O Timing and the
Quartus II Timing Analyzer.
Excel-based I/O timing provides pin timing performance for each device density and
speed grade. The data is typically used prior to designing the FPGA to get an estimate
of the timing budget as part of the link timing analysis. The Quartus II Timing
Analyzer provides a more accurate and precise I/O timing data based on the specifics
of the design after you complete place-and-route.
1
The Excel-based I/O Timing spreadsheet will be available in the future release of the
Quartus II software.
February 2012 Altera Corporation
Cyclone V Device Handbook
Volume 1: Device Overview and Datasheet
ALTERA [ ALTERA CORPORATION ]
