EP2S180F1020C4 Datasheet, PDF (593/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

Configuring Stratix II and Stratix II GX Devices
If the configuration bit stream size exceeds the capacity of a serial
configuration device, you must select a larger configuration device
and/or enable the compression feature. When configuring multiple
devices, the size of the bitstream is the sum of the individual devices’
configuration bitstreams.
A system may have multiple devices that contain the same configuration
data. In active serial chains, this can be implemented by storing two
copies of the SOF in the serial configuration device. The first copy would
configure the master Stratix II or Stratix II GX device, and the second
copy would configure all remaining slave devices concurrently. All slave
devices must be the same density and package. The setup is similar to
Figure 7–13, where the master is set up in active serial mode and the slave
devices are set up in passive serial mode.
To configure four identical Stratix II or Stratix II GX devices with the
same SOF, you could set up the chain similar to the example shown in
Figure 7–14. The first device is the master device and its MSEL pins should
be set to select AS configuration. The other three slave devices are set up
for concurrent configuration and its MSEL pins should be set to select PS
configuration. The nCEO pin from the master device drives the nCE input
pins on all three slave devices, and the DATA and DCLK pins connect in
parallel to all four devices. During the first configuration cycle, the master
device reads its configuration data from the serial configuration device
while holding nCEO high. After completing its configuration cycle, the
master drives nCE low and transmits the second copy of the configuration
data to all three slave devices, configuring them simultaneously.
Altera Corporation
January 2008
7–41
Stratix II Device Handbook, Volume 2