Analog Devices ADSP-21364 system manual Boot Mode and Clock Ratio Select Switch SW10

Switch Settings

When position 6 is ON, the values of the LEDs are set by writing to a mem- ory location. The lower 8 bits of the data written to the address 0x1400 0000 set the values of the LEDs. By default, position 6 is ON. For more information refer to “LEDs and Push Buttons” on page 1-10.

Boot Mode and Clock Ratio Select Switch (SW10)

The SW10 switch sets the boot mode and clock multiplier ratio. Table 2-4shows how to set up the boot mode using SW10 positions 1 and 2. By default, the EZ-KIT Lite boots in parallel port mode from the flash memory.

Table 2-4. Boot Mode Configuration (SW10)

BOOTCFG1 Pin (Position 2)	BOOTCFG0 Pin (Position 1)	Boot Mode
OFF	OFF	SPI slave boot
OFF	ON	SPI master boot
ON	OFF	Parallel flash boot (default)
ON	ON	Internal boot

Table 2-5shows how to set up the clock multiply ratio using SW10 positions 3 and 4. By default, the processor increases the clock multiply ratio by six, setting the core clock to 147.456 MHz.

Table 2-5. Core Clock Rate Configuration (SW10)

CLKCFG1 (Position 4)	CLKCFG0 (Position 3)	Core to CLKIN Ratio
OFF	OFF	6:1 (default)
OFF	ON	32:1
ON	OFF	16:1
ON	ON	NA

2-12 ADSP-21364 EZ-KIT Lite Evaluation System Manual