Switch Settings
2-10
ADSP-21375 EZ-KIT Lite Evaluation System Manual
Boot Mode and Clock Ratio Select Switch (SW2)
The
SW2
switch sets the boot mode and clock multiplier ratio.
shows how to set up the boot mode using
SW2
positions 1 and 2. By
default, the EZ-KIT Lite boots in external port mode from the flash
memory.
shows how to set up the clock multiply ratio using
SW2
positions 3 and 4. By default, the processor increases the clock multiply
ratio by sixteen, setting the core clock to 262.144 MHz.
The core clock frequency can be increased or decreased via software by
writing to the
PMCTL
register. For more information on changing the core
clock frequency and other setup information, refer to the
ADSP-21368
SHARC Processor Hardware Reference
(includes ADSP-21375).
Table 2-3. Boot Mode Configuration Switch (SW2)
BOOTCFG0 Pin (Position 1)
BOOTCFG1 Pin (Position 2)
Boot Mode
ON
ON
SPI slave boot
ON
OFF
Parallel flash boot (default)
OFF
ON
SPI master boot
OFF
OFF
Reserved
Table 2-4. Core Clock Rate Configuration
CLKCFG0 (Position 3)
CLKCFG1 (Position 4)
Core to CLKIN Ratio
ON
ON
6:1
ON
OFF
16:1 (default)
OFF
ON
32:1
OFF
OFF
Reserved
