EP2S180F1020C4 Datasheet, PDF (649/768 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 4 of 10)
Pin Name
User Mode
Configuration
Scheme
nSTATUS
(continued)
Pin Type
Description
If VCCPD and VCCIO are not fully powered up,
the following could occur:
● VCCPD and VCCIO are powered high
enough for the nSTATUS buffer to function
properly, and nSTATUS is driven low.
When VCCPD and VCCIO are ramped up,
POR trips, and nSTATUS is released after
POR expires.
● VCCPD and VCCIO are not powered high
enough for the nSTATUS buffer to function
properly. In this situation, nSTATUS might
appear logic high, triggering a
configuration attempt that would fail
because POR did not yet trip. When
VCCPD and VCCIO are powered up,
nSTATUS is pulled low because POR did
not yet trip. When POR trips after VCCPD
and VCCIO are powered up, nSTATUS is
released and pulled high. At that point,
reconfiguration is triggered and the device
is configured.
Altera Corporation
January 2008
7–97
Stratix II Device Handbook, Volume 2