EP2S180F1020C4 Datasheet, PDF (655/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

Configuring Stratix II and Stratix II GX Devices
Table 7–22. Dedicated Configuration Pins on the Stratix II and Stratix II GX Device (Part 10 of 10)
Pin Name
nCS/CS
User Mode
Configuration
Scheme
I/O
PPA
Pin Type
Input
Description
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 ground while CS
is toggled to control configuration.
In non-PPA schemes, it functions as a user I/O
pin during configuration, which means it is
tri-stated.
RUnLU
N/A if using
Remote
System
Upgrade
I/O if not
Remote
System
Upgrade in
FPP, PS or
PPA
PGM[2..0]
N/A if using
Remote
System
Upgrade
I/O if not
using
Remote
System
Upgrade in
FPP, PS or
PPA
Input
Output
After PPA configuration, nCS and CS are
available as user I/O pins and the state of
these pins depends on the Dual-Purpose Pin
settings.
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 pin is available as
general-purpose user I/O pin.
These output pins select one of eight pages in
the memory (either flash or enhanced
configuration device) when using a remote
system upgrade mode.
When not using remote update or local update
configuration modes, these pins are available
as general-purpose user I/O pins.
Altera Corporation
January 2008
7–103
Stratix II Device Handbook, Volume 2