Chapter 11: SEU Mitigation in the Cyclone III Device Family
11–9
Software Support
Table 11–7 lists the name of the WYSIWYG atom for Cyclone III device family.
Table 11–7. WYSIWYG Atoms
Device
Cyclone III
WYSIWYG Atom
cycloneiii_crcblock
cycloneiiils_crcblock
Cyclone III LS
1
To enable the cycloneiii_crcblockprimitive in version 8.0 SP1 or earlier of the
Quartus II software, turn on the error detection CRC feature in the Device and Pins
Options dialog box. This is not required when you are using version 8.1 and later of
the Quartus II software.
Example 11–1 shows an example of how to define the input and output ports of a
WYSIWYG atom in a Cyclone III LS device.
Example 11–1. Error Detection Block Diagram
cycloneiiils_crcblock<crcblock_name>
(
.clk(<clock source>),
.shiftnld(<shiftnld source>),
.ldsrc(<ldsrc source>),
.crcerror(<crcerror out destination>),
.regout(<output destination>),
.cyclecomplete(<cyclecomplete destination>),
);
Table 11–8 lists the input and output ports that must be included in the atom. The
input and output ports of the atoms for Cyclone III device family are similar, except
for the cyclecompleteport which is for Cyclone III LS devices only.
Table 11–8. CRC Block Input and Output Ports (Part 1 of 2)
Port
Input/Output
Definition
Unique identifier for the CRC block, and represents any identifier name that is
legal for the given description language (For example Verilog HDL, VHDL,
AHDL). This field is required.
<crcblock_name>
Input
This signal designates the clock input of this cell. All operations of this cell are
with respect to the rising edge of the clock. Whether it is the loading of the
data into the cell or data out of the cell, it always occurs on the rising edge.
This port is required.
.clk(<clock source>
Input
Input
This signal is an input into the error detection block. If shiftnld=1, the
data is shifted from the internal shift register to the regoutat each rising edge
of clk. If shiftnld=0, the shift register parallel loads either the
pre-calculated CRC value or the update register contents depending on the
ldsrcport input. This port is required.
.shiftnld (<shiftnld
source>)
December 2011 Altera Corporation
Cyclone III Device Handbook
Volume 1
ALTERA [ ALTERA CORPORATION ]
