EP2S130F1020I4 Datasheet, PDF (591/768 Pages) List of Unclassifed Manufacturers – Stratix II Device Handbook, Volume 1

Configuring Stratix II and Stratix II GX Devices
Device & Pin Options dialog box) is turned on, the Stratix II or
Stratix II GX device resets the configuration device by pulsing nCSO,
releases nSTATUS after a reset time-out period (maximum of 100 µs), and
retries configuration. If this option is turned off, the system must monitor
nSTATUS for errors and then pulse nCONFIG low for at least 2 µs to restart
configuration.
When the Stratix II or Stratix II GX device is in user mode, you can initiate
reconfiguration by pulling the nCONFIG pin low. The nCONFIG pin
should be low for at least 2 µs. When nCONFIG is pulled low, the device
also pulls nSTATUS and CONF_DONE low and all I/O pins are tri-stated.
Once nCONFIG returns to a logic high level and nSTATUS is released by
the Stratix II or Stratix II GX device, reconfiguration begins.
You can configure multiple Stratix II or Stratix II GX devices using a
single serial configuration device. You can cascade multiple Stratix II or
Stratix II GX devices using the chip-enable (nCE) and chip-enable-out
(nCEO) pins. The first device in the chain must have its nCE pin connected
to ground. You must connect its nCEO pin to the nCE pin of the next
device in the chain. When the first device captures all of its configuration
data from the bit stream, it drives the nCEO pin low, enabling the next
device in the chain. You must leave the nCEO pin of the last device
unconnected. The nCONFIG, nSTATUS, CONF_DONE, DCLK, and DATA0
pins of each device in the chain are connected (refer to Figure 7–13).
This first Stratix II or Stratix II GX device in the chain is the configuration
master and controls configuration of the entire chain. You must connect
its MSEL pins to select the AS configuration scheme. The remaining
Stratix II or Stratix II GX devices are configuration slaves and you must
connect their MSEL pins to select the PS configuration scheme. Any other
Altera device that supports PS configuration can also be part of the chain
as a configuration slave. Figure 7–13 shows the pin connections for this
setup.
Altera Corporation
January 2008
7–39
Stratix II Device Handbook, Volume 2