EP2C8T144C8N Datasheet, PDF (357/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Configuration
File Format
Configuration
Data
Compression
Configuring Cyclone II Devices
Table 13–3 shows the approximate uncompressed configuration file sizes
for Cyclone II devices. To calculate the amount of storage space required
for multiple device configurations, add the file size of each device
together.
Table 13–3. Cyclone II Raw Binary File (.rbf) Sizes
Device
EP2C5
EP2C8
EP2C15
EP2C20
EP2C35
EP2C50
EP2C70
Data Size (Bits)
1,265,792
1,983,536
3,892,496
3,892,496
6,858,656
9,963,392
14,319,216
Note to Table 13–3:
(1) These values are preliminary.
Note (1)
Data Size (Bytes)
152,998
247,974
486,562
486,562
857,332
1,245,424
1,789,902
Use the data in Table 13–3 only to estimate the file size before design
compilation. Different configuration file formats, such as a Hexadecimal
(.hex) or Tabular Text File (.ttf) format, have different file sizes. However,
for any specific version of the Quartus^® II software, any design targeted
for the same device has the same uncompressed configuration file size. If
compression is used, the file size can vary after each compilation since the
compression ratio is dependent on the design.
Cyclone II devices support configuration data decompression, which
saves configuration memory space and time. This feature allows you to
store compressed configuration data in configuration devices or other
memory and transmit this compressed bitstream to Cyclone II devices.
During configuration, the Cyclone II device decompresses the bitstream
in real time and programs its SRAM cells.
1 Preliminary data indicates that compression reduces
configuration bitstream size by 35 to 55%.
Cyclone II devices support decompression in the AS and PS
configuration schemes. Decompression is not supported in JTAG-based
configuration.
Altera Corporation
February 2007
13–3
Cyclone II Device Handbook, Volume 1