Altera Nios Development Board - Manual (Page 34)

1–26 Altera Corporation
Nios Development Board Reference Manual, Stratix Edition September 2004
Power-Supply Circuitry
Figure 1–19. Safe Config Button
SW9 – Safe Config
Pressing Safe Config (SW9) commands the configuration controller to re-
configure the Stratix device with the factory-programmed safe
configuration.
SW10 – Reset, Config
Reset, Config (SW10) is the power-on reset button (see Figure 1–20 ).
When SW10 is pressed, a logic 0 is driven to the power-on reset controller
(U18). See
“Power-Supply Circuitry” on page 1–26 for more details. After
SW10 is pressed, the configuration controller will load the Stratix device
from flash memory.
Figure 1–20. Reset, Config Button
Power-Supply
Circuitry The Nios development board runs from a 9-V, unregulated, center-
negative input power supply. On-board circuitry generates 5-V, 3.3-V, and
1.5-V regulated power levels.
■ The 5-V supply is presented on pin 2 of J12 and J15 for use by any
device plugged into the PROTO1 & PROTO2 expansion connectors.
■ The 3.3-V supply is used as the power source for all Stratix device
I/O pins. The 3.3-V supply is also available for PROTO1 & PROTO2
daughter cards.
■ The 1.5-V supply is used only as the power supply for the Stratix
device core (VCCINT) and it is not available on any connector or
header.