EP2AGX95EF29C6N Datasheet, PDF (290/380 Pages) Altera Corporation – Device Interfaces and Integration

9–4
Chapter 9: Configuration, Design Security, and Remote System Upgrades in Arria II Devices
Power-On Reset Circuit and Configuration Pins Power Supply
Power-On Reset Circuit and Configuration Pins Power Supply
The following sections describe the power-on reset (POR) circuit and the power
supply for the configuration pins.
Power-On Reset Circuit
The POR circuit keeps the entire system in reset mode until the power supply voltage
levels have stabilized on power-up. After power-up, the device does not release
nSTATUS until the voltage levels are above the POR trip point of the device. Table 9–3
lists the voltages required for power-up in Arria II devices.
Table 9–3. Required Voltages for Arria II Devices
Devices
Arria II GX
Arria II GZ
Voltages
V_CCCB, V_{CCA_PLL}, V_CC, V_CCPD, and V_CCIO for I/O banks 3C or 8C
V_CC, V_CCAUX, V_CCCB, V_CCPGM, and V_CCPD
On power down for Arria II GX devices, brown-out occurs if V_CC ramps down below
the POR trip point and any of the V_CC, V_CCPD, or V_CCIO voltages for I/O banks 3C or
8C drops below the threshold. On power down for Arria II GZ devices, brown-out
occurs if the V_CC, V_CCAUX, V_CCCB, V_CCPGM, or V_CCPD voltages drops below the
threshold voltage.
In Arria II devices, you can select between a fast POR time or a standard POR time.
For Arria II GX devices, selection depends on the MSEL pin settings. For Arria II GZ
devices, selection depends on the PORSEL input pin. PORSEL = L is set as standard POR
time. PORSEL = H is set as fast POR time. Fast POR time is 4 ms < T_POR < 12 ms for a
fast configuration time. Standard POR time is 100 ms < T_POR < 300 ms for a lower
power-ramp rate.
Arria II Device Handbook Volume 1: Device Interfaces and Integration
July 2012 Altera Corporation