EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 366

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

SEU Mitigation in Cyclone III Devices
Error Detection
Pin Description
CRC_ERROR Pin
Error Detection
Block
13–4
Cyclone III Device Handbook, Volume 1
CRC_ERROR
Table 13–2. CRC_ERROR Pin Description
Pin Name
I/O, output
f
Pin Type
pin reports a soft error when configuration CRAM data is corrupted, and
you have to decide whether to reconfigure the FPGA by strobing the
nCONFIG pin low or ignore the error.
A specific error detection pin, CRC_ERROR, is required to monitor the
results of the error detection circuitry during user mode.
Table 13–2
The CRC_ERROR pin information for Cyclone III devices is reported in
the Device Pin-Outs on the Literature page of the Altera web site
(www.altera.com).
You can enable the Cyclone III device error detection block in the
Quartus II software (refer to
block contains the logic necessary to calculate the 32-bit CRC signature
for the configuration CRAM bits in the device.
The CRC circuit continues running even if an error occurs. When a soft
error occurs, the device sets the CRC_ERROR pin high. There are two types
of CRC detection to check the configuration bits:
■
1
■
This is an active high signal that indicates that the error detection circuit has
detected errors in the configuration CRAM bits. This pin is optional and is
used when the error detection CRC circuit is enabled. When the error
detection CRC circuit is disabled, it is a user I/O pin. The CRC error output,
when using the WYSIWYG function, is a dedicated path to the
pin. The
CRAM error checking ability (32-bit CRC) during user mode, for use
by the CRC_ERROR pin.
16-bit CRC embedded in every configuration data frame.
There is only one 32-bit CRC value and this 32-bit CRC value
covers all of the CRAM data.
describes the CRC_ERROR pin.
CRC_ERROR
pin does not support open-drain or inversion.
“Software Support” on page
Description
Altera Corporation-Preliminary
13–8). This
CRC_ERROR
March 2007