Here is resume of testing of 4 different configurations of the system, composed with following elements:
- cpu NIOS II
- memory
- buttons
- switches
- LEDs
- 2 timers
- System ID
- PLL*
* PLL is used to generate clock for
cpu and all peripherals. It wasn't present in all configurations (please, see the table below). When
pll isn't used, the external clock (
50mhz) was employed to clock everything
These 4 configuration differ in type of memory (on-chip or SDRAM) and presence or absence of PLL. Here is resume:
configuration feature system test with eclipse Memory: on-chip, PLL: Yes
Works
Memory: on-chip, PLL: No
Downloaded, but hangs immediately
Memory: SDRAM, PLL: Yes
Failed to download
Memory: SDRAM, PLL: No
Failed to download
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