ep3c120f780c8nes Altera Corporation, ep3c120f780c8nes Datasheet - Page 274

• Manufacturer Part Number: ep3c120f780c8nes
• Description: Cyclone Iii Device Family
• Manufacturer: Altera Corporation

Configuring Cyclone III Devices
10–38
Cyclone III Device Handbook, Volume 1
f
CONF_DONE low and all I/O pins are tri-stated. When nCONFIG returns
to a logic high level and nSTATUS is released by the Cyclone III device,
reconfiguration begins.
1
For more information on configuration issues, refer to the Debugging
Configuration Problems chapter of the Configuration Handbook and the
FPGA Configuration Troubleshooter on the Altera web site
(www.altera.com).
Multi-Device AP Configuration
You can configure multiple Cyclone III devices using a single parallel
flash. You can cascade multiple Cyclone III 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 GND. You must connect its nCEO pin to the
nCE pin of the next device in the chain. Use an external 10-kΩ pull-up
resistor to pull the nCEO signal high to its V
weak pull-up resistor. When the first device captures all of its
configuration data from the bitstream, it drives the nCEO pin low,
enabling the next device in the chain. You can leave the nCEO pin of the
last device unconnected or use it as a user I/O pin after configuration if
the last device in the chain is a Cyclone III device. The nCONFIG,
nSTATUS, CONF_DONE, DCLK, DATA[15..8], and DATA[7..0] pins of
each device in the chain are connected (refer to
Figure
This first Cyclone III device in the chain is the configuration master and
controls configuration of the entire chain. You must connect its MSEL pins
to select the AP configuration scheme. The remaining Cyclone III devices
are configuration slaves and you must connect their MSEL pins to select
the FPP configuration scheme. Any other Altera device that supports FPP
configuration can also be part of the chain as a configuration slave (refer
to
The two configurations for the DATA[15..0] bus in multi-device AP
configuration are the byte-wide multi-device AP configuration and the
word-wide multi-device AP configuration.
Figure 10–10
10–11).
If you use the optional CLKUSR pin and the nCONFIG pin is
pulled low to restart configuration during device initialization,
ensure CLKUSR continues to toggle during the time nSTATUS is
low (a maximum of 80 μs).
and
Figure
10–11).
Altera Corporation-Preliminary
CCIO
Figure 10–10
level to help the internal
and
March 2007