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Board Components
Figure 2–17. Reset, Config Button
SW10
Reset,
Config
Reset Distribution
The EPM7256AE device takes a power-on reset pulse from the Linear
Technologies 1326 power-sense/reset-generator chip (U18) and
distributes it (through internal logic) to other reset pins on the board, that
include the following:
■
■
■
■
LAN91C111 (Ethernet MAC/PHY) reset
Flash memory reset
CompactFlash reset
Reset signals delivered to the expansion prototype connectors
(PROTO1 & PROTO2)
Starting Configuration
The following four methods start a configuration sequence:
1.
2.
3.
4.
Board power-on
Pressing the Reset, Config button (SW10).
Asserting (driving 0 volts on) the pld_reconfigreq_n input pin
of the EPM7256AE device (U3 pin 94) from the FPGA (U62 pin
AA14).
Pressing the Factory Config button (SW9).
Factory & User Configurations
The configuration controller can manage two separate FPGA
configurations stored in flash memory U5. These two configurations are
referred to as the factory configuration and the user configuration. A
2–36 Reference Manual
Nios Development Board Cyclone II Edition
Altera Corporation
May 2007
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