
7–102
Altera Corporation
Stratix II Device Handbook, Volume 2
January 2008
Device Configuration Pins
nRS
I/O
PPA
Input
Read strobe input. A low input directs the
device to drive the RDYnBSY signal on the
DATA7
pin.
If the nRS pin is not used in PPA mode, it
should be tied high. In non-PPA schemes, it
functions as a user I/O during configuration,
which means it is tri-stated.
After PPA configuration, nRS is available as a
user I/O pin and the state of this pin depends
on the Dual-Purpose Pin settings.
RDYnBSY
I/O
PPA
Output
Ready output. A high output indicates that the
target device is ready to accept another data
byte. A low output indicates that the target
device is busy and not ready to receive
another data byte.
In PPA configuration schemes, this pin will
drive out high after power-up, before
configuration and after configuration before
entering user-mode. In non-PPA schemes, it
functions as a user I/O pin during
configuration, which means it is tri-stated.
After PPA configuration, RDYnBSY is
available as a user I/O pin and the state of this
pin depends on the Dual-Purpose Pin
settings.
Table 7–22. Dedicated Configuration Pins on the Stratix II and Stratix II GX Device (Part 9 of 10)
Pin Name
User Mode
Configuration
Scheme
Pin Type
Description