Chapter 3: Configuration and Testing
3–5
Configuration
VCCSEL is sampled during power up. Therefore, the VCCSEL setting cannot change
on-the-fly or during a reconfiguration. The VCCSEL input buffer is powered by VCCINT
and must be hard-wired to VCCPD or ground. A logic high VCCSEL connection selects the
1.8-V/1.5-V input buffer, and a logic low selects the 3.3-V/2.5-V input buffer. VCCSEL
should be set to comply with the logic levels driven out of the configuration device or
MAX II microprocessor.
If the design must support configuration input voltages of 3.3 V/2.5 V, set VCCSEL to a
logic low. You can set the VCCIO voltage of the I/O bank that contains the configuration
inputs to any supported voltage. If the design must support configuration input
voltages of 1.8 V/1.5 V, set VCCSEL to a logic high and the VCCIO of the bank that
contains the configuration inputs to 1.8 V/1.5 V.
f
For more information about multi-volt support, including information about using
TDOand nCEOin multi-volt systems, refer to the Arria GX Architecture chapter.
Configuration Schemes
You can load the configuration data for an Arria GX device with one of five
configuration schemes (refer to Table 3–4), chosen on the basis of the target
application. You can use a configuration device, intelligent controller, or the JTAG
port to configure an Arria GX device. A configuration device can automatically
configure an Arria GX device at system power up.
You can configure multiple Arria GX devices in any of the five configuration schemes
by connecting the configuration enable (nCE) and configuration enable output (nCEO)
pins on each device. Arria GX FPGAs offer the following:
■
Configuration data decompression to reduce configuration file storage
Remote system upgrades for remotely updating Arria GX designs
■
Table 3–4 lists which configuration features can be used in each configuration scheme.
f
For more information about configuration schemes in Arria GX devices, refer to the
Configuring Arria GX Devices chapter.
Table 3–4. Arria GX Configuration Features (Part 1 of 2)
Configuration Scheme
Configuration Method
Decompression
Remote System Upgrade
MAX II device or microprocessor
and flash device
v (1)
v
FPP
AS
Enhanced configuration device
Serial configuration device
v (2)
v
v
v (3)
v
MAX II device or microprocessor
and flash device
v
PS
Enhanced configuration device
v
v
—
v
—
v
Download cable (4)
MAX II device or microprocessor
and flash device
PPA
© December 2009 Altera Corporation
Arria GX Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
