Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
9–5
Configuration Features
2. Under Output programming file, from the pull-down menu, select your desired
file type.
3. If you select the Programmer Object File (.pof), you must specify a configuration
device, directly under the file type.
4. In the Input files to convert box, select SOF Data.
5. Click Add File to browse to the Cyclone III device family .sofs.
6. In the Convert Programming Files dialog box, select the .pof you added to SOF
Data and click Properties.
7. In the SOF File Properties dialog box, turn on the Compression option.
When multiple devices in Cyclone III device family are cascaded, you can selectively
enable the compression feature for each device in the chain. Figure 9–2 shows a chain
of two devices in Cyclone III device family. The first device has compression enabled
and receives compressed bitstream from the configuration device. The second device
has the compression feature disabled and receives uncompressed data. You can
generate programming files for this setup from the Convert Programming Files
dialog box from the File menu in the Quartus II software.
Figure 9–2. Compressed and Uncompressed Configuration Data in the Same Configuration File
Serial Data
Serial Configuration
Device
Compressed
Uncompressed
V
CC
Decompression
Controller
10 kΩ
Cyclone III
Device Family
Cyclone III
Device Family
nCE
nCEO
nCE
nCEO
N.C.
GND
Configuration Requirement
The following section describes power-on-reset (POR) for Cyclone III device family.
POR Circuit
The POR circuit keeps the device in the reset state until the power supply voltage
levels have stabilized after device power-up. After device power-up, the device does
not release nSTATUSuntil the required voltages listed in table Table 9–4 on page 9–8
are above the POR trip point of the device. VCCINT and VCCA are monitored for brown-
out conditions after device power-up.
1
VCCA is the analog power to the phase-locked loop (PLL).
August 2012 Altera Corporation
Cyclone III Device Handbook
Volume 1
ALTERA [ ALTERA CORPORATION ]
