EP4CE6E22C8N Altera, EP4CE6E22C8N Datasheet - Page 251

• Manufacturer Part Number: EP4CE6E22C8N
• Description: IC CYCLONE IV FPGA 6K 144EQFP
• Manufacturer: Altera
• Series: CYCLONE® IV Er

Specifications of EP4CE6E22C8N

• Number Of Logic Elements/cells: 6272
• Number Of Labs/clbs: 392
• Total Ram Bits: 270000
• Number Of I /o: 91
• Voltage - Supply: 1.15 V ~ 1.25 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 144-EQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -
• Lead Free Status / Rohs Status: Compliant

Chapter 9: SEU Mitigation in Cyclone IV Devices
Error Detection Timing
Table 9–4. Error Detection Registers
Error Detection Timing
© February 2010 Altera Corporation
Register
32-bit signature
register
32-bit storage register
Table 9–4
When the error detection CRC feature is enabled through the Quartus II software, the
device automatically activates the CRC process upon entering user mode after
configuration and initialization is complete.
The CRC_ERROR pin is driven low until the error detection circuitry detects a
corrupted bit in the previous CRC calculation. After the pin goes high, it remains high
during the next CRC calculation. This pin does not log the previous CRC calculation.
If the new CRC calculation does not contain any corrupted bits, the CRC_ERROR pin is
driven low. The error detection runs until the device is reset.
The error detection circuitry runs off an internal configuration oscillator with a divisor
that sets the maximum frequency.
Table 9–5
Table 9–5. Minimum and Maximum Error Detection Frequencies for Cyclone IV Devices
This register contains the CRC signature. The signature register contains the result of the user
mode calculated CRC value compared against the pre-calculated CRC value. If no errors are
detected, the signature register is all zeros. A non-zero signature register indicates an error in the
configuration CRAM contents.
The CRC_ERROR signal is derived from the contents of this register.
This register is loaded with the 32-bit pre-computed CRC signature at the end of the configuration
stage. The signature is then loaded into the 32-bit CRC circuit (called the Compute and Compare
CRC block, as shown in
forms a 32-bit scan chain during execution of the CHANGE_EDREG JTAG instruction. The
CHANGE_EDREG JTAG instruction can change the content of the storage register. Therefore, the
functionality of the error detection CRC circuitry is checked in-system by executing the instruction
to inject an error during the operation. The operation of the device is not halted when issuing the
CHANGE_EDREG instruction.
Error Detection
Frequency
80 MHz/2
defines the registers shown in
lists the minimum and maximum error detection frequencies.
n
Detection Frequency
Maximum Error
Figure
80 MHz
9–1) during user mode to calculate the CRC error. This register
Function
Figure
Detection Frequency
Minimum Error
312.5 kHz
9–1.
Cyclone IV Device Handbook, Volume 1
0, 1, 2, 3, 4, 5, 6, 7, 8
Valid Divisors (2
n
)
9–5