EP3C80 datasheet(174/274 Pages) ALTERA

174 / 274 page

9–16

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

Configuration Features

Cyclone III Device Handbook

August 2012

Altera Corporation

Volume 1

1 When connecting a serial configuration device to the Cyclone III device family in the

multi-device AS configuration, you must connect a 25- series resistor at the near end

of the serial configuration device for DATA[0].

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

configuration device to the master device of the Cyclone III device family must follow

the recommendations in Table 9–9 on page 9–20. You must also connect the repeater

buffers between the master and slave devices of the Cyclone III device family for

DATA[0]

and DCLK. All I/O inputs must maintain a maximum AC voltage of 4.1 V. The

output resistance of the repeater buffers must fit the maximum overshoot equation

outlined in “Configuration and JTAG Pin I/O Requirements” on page 9–7.

As shown in Figure 9–4 on page 9–15, the nSTATUS and CONF_DONE pins on all target

devices are connected together with external pull-up resistors. 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

this line and all devices simultaneously enter initialization mode.

1 Although you can cascade Cyclone III device family, 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 devices configuration bitstreams.

Configuring Multiple Cyclone III Device Family with the Same Design

Certain designs require you to configure multiple Cyclone III device family with the

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

following methods:

■

Multiple SRAM Object Files

■

Single SRAM Object File

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 III device family and the second copy to

configure all the remaining slave devices concurrently. All slave devices must be of

the same density and package. The setup is similar to Figure 9–4 on page 9–15, in

which the master device is set up in AS mode and the slave devices are set up in PS

mode.

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