Altera Corporation 11–57
July 2005 Stratix Device Handbook, Volume 2
Configuring Stratix & Stratix GX Devices
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 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 drives
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 during configuration, which means it is
tri-stated.
After PPA configuration,
RDYnBSY is available
as a user I/O and the state of this pin depends
on the Dual-Purpose Pin settings.
Table 11–15. Dedicated Configuration Pins on the Stratix or Stratix GX Device (Part 7 of 8)
Pin Name User Mode
Configuration
Scheme
Pin Type Description
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