EP4CE40 datasheet(167/488 Pages) ALTERA

167 / 488 page

Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices

8–3

Configuration

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 1

3. Click the Configuration tab.

4. Turn on Generate compressed bitstreams.

5. Click OK.

6. In the Settings dialog box, click OK.

You can enable compression when creating programming files from the Convert

Programming Files

dialog box. To enable compression, perform the following steps:

1. On the File menu, click Convert Programming Files.

2. Under Output programming file, select your desired file type from the

Programming file type

list.

3. If you select Programmer Object File (.pof), you must specify the configuration

device in the Configuration device list.

4. Under Input files to convert, select SOF Data.

5. Click Add File to browse to the Cyclone IV device SRAM object files (.sof).

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 Cyclone IV devices are cascaded, you can selectively enable the

compression feature for each device in the chain. Figure 8–1 shows a chain of two

Cyclone IV devices. 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 in the Convert Programming Files dialog box.

Configuration Requirement

This section describes Cyclone IV device configuration requirement and includes the

following topics:

■

“Power-On Reset (POR) Circuit” on page 8–4

■

“Configuration File Size” on page 8–4

■

“Power Up” on page 8–6

Figure 8–1. Compressed and Uncompressed Configuration Data in the Same Configuration File

nCE

GND

nCEO

Decompression

Controller

Cyclone IV

Device

nCE

nCEO

Not Connected (N.C.)

Cyclone IV

Device

Serial Configuration

Device

Serial Data

Compressed

Uncompressed

VCC

10 k

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