EP4SE360F35I4 Datasheet, PDF (379/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

Chapter 10: Configuration, Design Security, and Remote System Upgrades in Stratix IV Devices
Device Configuration Pins
10–43
Table 10–10. Dedicated Configuration Pins on the Stratix IV Device (Part 2 of 4)
Pin Name
User Mode
Configuration
Scheme
MSEL[2..0]
N/A
All
nCONFIG
N/A
All
nSTATUS
N/A
All
Pin Type
Input
Input
Bidirectional
open-drain
Description
Three-bit configuration input that sets the Stratix IV device
configuration scheme. For the appropriate connections,
refer to Table 10–1 on page 10–2.
You must hardwire these pins to V_CCPGM or GND.
The MSEL[2..0] pins have internal 5-k pull-down
resistors that are always active.
Configuration control input. Pulling this pin low during
user-mode causes the device to lose its configuration data,
enter a reset state, and tri-state all I/O pins. Returning this
pin to a logic high level initiates a reconfiguration.
Configuration is possible only if this pin is high, except in
JTAG programming mode, when nCONFIG is ignored.
The device drives nSTATUS low immediately after power-up
and releases it after the POR time.
During user mode and regular configuration, this pin is
pulled high by an external 10-k resistor.
This pin, when driven low by the Stratix IV device, indicates
that the device has encountered an error during
configuration.
■ Status output—If an error occurs during configuration,
nSTATUS is pulled low by the target device.
■ Status input—If an external source drives the nSTATUS
pin low during configuration or initialization, the target
device enters an error state.
Driving nSTATUS low after configuration and initialization
does not affect the configured device. If you use a
configuration device, driving nSTATUS low causes the
configuration device to attempt to configure the device, but
because the device ignores transitions on nSTATUS in user
mode, the device does not reconfigure. To initiate a
reconfiguration, nCONFIG must be pulled low.
If you have enabled the Auto-restart configuration after
error option, the nSTATUS pin transitions from high to low
and back again to high when a configuration error is
detected. This appears as a low pulse at the pin with a
minimum pulse width of 10 s to a maximum pulse width
of 500 s, as defined in the t_STATUS specification.
September 2012 Altera Corporation
Stratix IV Device Handbook
Volume 1