EP4CE40 datasheet(178/488 Pages) ALTERA

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8–14

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

Configuration

Cyclone IV Device Handbook,

May 2013

Altera Corporation

Volume 1

The first Cyclone IV device in the chain is the configuration master and it controls the

configuration of the entire chain. Other Altera devices that support PS configuration

can also be part of the chain as configuration slaves.

1 In the multi-device AS configuration, the board trace length between the serial

configuration device and the master device of the Cyclone IV device must follow the

recommendations in Table 8–7 on page 8–18.

The nSTATUS and CONF_DONE pins on all target devices are connected together with

external pull-up resistors, as shown in Figure 8–3 on page 8–13. These pins are

open-drain bidirectional pins on the devices. When the first device asserts nCEO (after

receiving all its configuration data), it releases its CONF_DONE pin. However, the

subsequent devices in the chain keep this shared CONF_DONE line low until they receive

their configuration data. When all target devices in the chain receive their

configuration data and release CONF_DONE, the pull-up resistor drives a high level on

CONF_DONE

line and all devices simultaneously enter initialization mode.

1 Although you can cascade Cyclone IV devices, serial configuration devices cannot be

cascaded or chained together.

If the configuration bitstream size exceeds the capacity of a serial configuration

device, you must select a larger configuration device, enable the compression feature,

or both. When configuring multiple devices, the size of the bitstream is the sum of the

individual device’s configuration bitstream.

Configuring Multiple Cyclone IV Devices with the Same Design

Certain designs require that you configure multiple Cyclone IV devices with the same

design through a configuration bitstream, or a .sof. You can do this through the

following methods:

■

Multiple .sof

■

Single .sof

1 For both methods, the serial configuration devices cannot be cascaded or chained

together.

Multiple SRAM Object Files

Two copies of the .sof are stored in the serial configuration device. Use the first copy

to configure the master device of the Cyclone IV device and the second copy to

configure all remaining slave devices concurrently. All slave devices must have the

same density and package. The setup is similar to Figure 8–3 on page 8–13.

To configure four identical Cyclone IV devices with the same .sof, you must set up the

chain similar to the example shown in Figure 8–4. The first device is the master device

and its MSEL pins must be set to select AS configuration. The other three slave devices

are set up for concurrent configuration and their MSEL pins must be set to select PS

configuration. The nCEO pin from the master device drives the nCE input pins on all

three slave devices, as well as the DATA and DCLK pins that connect in parallel to all

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