EP4CE40 datasheet(247/488 Pages) ALTERA

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CYIV-51009-1.3

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Cyclone IV Device Handbook,

Volume 1

May 2013

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9. SEU Mitigation in Cyclone IV Devices

This chapter describes the cyclical redundancy check (CRC) error detection feature in

user mode and how to recover from soft errors.

1 Configuration error detection is supported in all Cyclone® IV devices including

Cyclone IV GX devices, Cyclone IV E devices with 1.0-V core voltage, and

Cyclone IV E devices with 1.2-V core voltage. However, user mode error detection is

only supported in Cyclone IV GX devices and Cyclone IV E devices with 1.2-V core

voltage.

Dedicated circuitry built into Cyclone IV devices consists of a CRC error detection

feature that can optionally check for a single-event upset (SEU) continuously and

automatically.

In critical applications used in the fields of avionics, telecommunications, system

control, medical, and military applications, it is important to be able to:

■

Confirm the accuracy of the configuration data stored in an FPGA device

■

Alert the system to an occurrence of a configuration error

Using the CRC error detection feature for Cyclone IV devices does not impact fitting

or performance.

This chapter contains the following sections:

■

“Configuration Error Detection” on page 9–1

■

“User Mode Error Detection” on page 9–2

■

“Automated SEU Detection” on page 9–3

■

“CRC_ERROR Pin” on page 9–3

■

“Error Detection Block” on page 9–4

■

“Error Detection Timing” on page 9–5

■

“Software Support” on page 9–6

■

“Recovering from CRC Errors” on page 9–9

Configuration Error Detection

1 Configuration error detection is available in all Cyclone IV devices including

Cyclone IV GX devices, Cyclone IV E devices with 1.0-V core voltage, and

Cyclone IV E devices with 1.2-V core voltage.

May 2013

CYIV-51009-1.3

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