CDPCLK4 datasheet(163/274 Pages) ALTERA

163 / 274 page

Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family

9–5

Configuration Features

August 2012

Altera Corporation

Cyclone III Device Handbook

Volume 1

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.

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 nSTATUS until 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).

Figure 9–2. Compressed and Uncompressed Configuration Data in the Same Configuration File

nCE

GND

nCEO

Decompression

Controller

Cyclone III

Device Family

nCE

nCEO

N.C.

Cyclone III

Device Family

Serial Configuration

Device

Serial Data

Compressed

Uncompressed

VCC

10 k

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