EP3SE50F780I3N Altera, EP3SE50F780I3N Datasheet - Page 386

• Manufacturer Part Number: EP3SE50F780I3N
• Description: Stratix III
• Manufacturer: Altera

Fast Active Serial Configuration (Serial Configuration Devices)
11–26
Stratix III Device Handbook, Volume 1
1
If the configuration bitstream 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, you can implement this by storing two copies
of the SOF in the serial configuration device. The first copy would
configure the master Stratix III device; 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
master is set up in active serial mode and the slave devices are set up in
passive serial mode.
To configure four identical Stratix III devices with the same SOF, you
could set up the chain similar to the example shown in
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 their 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.
While you can cascade Stratix III devices, you cannot cascade or
chain together serial configuration devices.
Figure
Figure
Altera Corporation
11–9, where the
November 2007
11–10. The