Analog Devices ADSP-21535 E-KIT LITE 3 PLL Setup Switch SW2 Functions, DSP Pin, Position

During reset, the function of these pins is to setup the PLL. At this time, these signals are attached to the PLL setup switch (SW2) and determine the core and external clock speeds of the DSP. Approximately 120uS after reset has been de- asserted these pins are no longer attached to SW2, but function as PFs.

The following table shows the switch position that corresponds to a DSP pin.

Table 4-3: PLL Setup Switch (SW2) Functions

DSP Pin	Switch
	Position
MSEL0	1
MSEL1	2
MSEL2	3
MSEL3	4
MSEL4	5
MSEL5	6
MSEL6	7
DF	8
SSEL0	9
SSEL1	10
None	11
Bypass	12

Figure 4-4shows the default setting for SW2. This will produce a 300MHz core clock speed and a 120 MHz peripheral interface speed. For more information about setting up the multiplication factors, refer to the Managing DSP Clocks section of the ADSP-21535 DSP Hardware Reference.

ON

1 2 3 4 5 6 7 8 9 10 11 12

Figure 4-4: Default PLL Setup Switch Settings (SW2)

!NOTE: A switch setting of “ON” supplies a logic low (0) on the corresponding DSP pin.

ADSP-21535 EZ-KIT Lite Evaluation System Manual 4-7