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Altera Corporation
EPXA1 Development Board Hardware Reference Manual
Using the Alternative 5-V DIL14 Oscillator
To use the alternative oscillator as the stripe clock reference, follow the
steps below:
1.
Remove any external clock input from the SMA connector.
2.
Plug the DIL14 crystal oscillator package into XSKT1.
3.
Set CLKA Select to position 2-3.
The clock buffer converts the 5-V input from the alternative 5-V
DIL14 oscillator to the 3.3 V required for the stripe.
Sources for CLK3 & CLK4
Clock sources for
CLK3
and
CLK4
can be selected in the same way as for
the embedded stripe clock sources. Follow the instructions given in
“Sources for the Stripe Clock Reference” on page 27
, but use jumper
CLKB Select to select the clock source, instead of CLKA Select.
Device
Configuration
There are two methods of programming and configuring the EPXA1
device:
■
Booting from flash memory
■
Using the Quartus
®
II software to configure the device via JTAG
See
for more details about using the JTAG
interface.
On the EPXA1 device, the settings of
BOOT_FLASH
,
MSEL0
, and
MSEL1
determine the configuration mode and method. On the
EPXA1 development board,
BOOT_FLASH
,
MSEL0
and
MSEL1
are tied to a setting that forces the device to boot from 16-bit flash
memory.
Booting from Flash Memory
The Altera flash memory programmer (
exc_flash_programmer.exe
) is a
utility that allows you to program flash memory on the EBI using the
JTAG interface and the ByteBlasterMV or MasterBlaster download cable,
so that you can boot from it.
After reset, the processor boots up and executes the bootloader from flash
memory. The bootloader configures the stripe, loads the user software
into memory, configures the FPGA side of the EPXA1, and then begins to
execute the user code.
Содержание Excalibur EPXA1
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