Altera Stratix - Page 484

11–58 Altera Corporation
Stratix Device Handbook, Volume 2 July 2005
Device Configuration Pins
nCS/CS
I/O PPA Input
Chip-select inputs. A low on
nCS and a high on
CS select the target device for configuration.
The
nCS and CS pins must be held active
during configuration and initialization.
During the PPA configuration mode, it is only
required to use either the
nCS or CS pin.
Therefore, if only one chip-select input is used,
the other must be tied to the active state. For
example,
nCS can be tied to GND while CS is
toggled to control configuration.In non-PPA
schemes, it functions as a user I/O during
configuration, which means it is tri-stated.
After PPA configuration,
nCS and CS are
available as a user I/Os and the state of these
pins depends on the Dual-Purpose Pin
settings.
RUnLU
N/A if using
Remote
Configuration;
I/O if not
Remote
Configuration
in FPP, PS or
PPA
Input Input that selects between remote update and
local update. A logic high (1.5-V, 1.8-V, 2.5-V,
3.3-V) selects remote update and a logic low
selects local update.
When not using remote update or local update
configuration modes, this pins is available as
general-purpose user I/O pin.
PGM[2..0]
N/A if using
Remote
Configuration;
I/O if not using
Remote
Configuration
in FPP, PS or
PPA
Input These output pins select one of eight pages in
the memory (either flash or enhanced
configuration device) when using a remote
configuration mode.
When not using remote update or local update
configuration modes, these pins are available
as general-purpose user I/O pins.
Table 11–15. Dedicated Configuration Pins on the Stratix or Stratix GX Device (Part 8 of 8)
Pin Name User Mode
Configuration
Scheme
Pin Type Description