Analog Devices ADSP-21535 E-KIT LITE Programmable Flag LEDs LED1, LED2, LED3, LED4, LED Reference

4.4.1Programmable Flag LEDs (LED1, LED2, LED3, LED4)

Four LEDs are connected to four of the DSP’s Programmable Flag (PF) pins, PF0-3. These LEDs are active HIGH and are lit by an output of “1” from the DSP. Refer to section 3.6 for more information about using of the PFs when programming the DSP.

Table 4-4: Programmable Flag LEDs

LED Reference	DSP Programmable
Designator	Flag Pin
LED4	PF0
LED1	PF1
LED2	PF2
LED3	PF3

4.4.2USB Monitor LED (LED5)

The USB Monitor LED (LED5) indicates that USB communication has been initialized successfully and you may connect to the DSP using a VisualDSP++ EZ-KIT Lite session. This should take approximately 15 seconds. If the LED does not light, try cycling power on the board and/or reinstalling the USB driver (see section 2.4.5).

4.4.3Power LED (LED6)

LED6 is a green LED that indicates when power is being properly supplied to the board.

4.4.4Reset LEDs (LED7, LED8)

When LED8 is lit, it indicates that the master reset of all the major ICs is active. When LED7 is lit, the USB interface chip (U11) is being reset. The USB chips will only reset on power-up, or if USB communication has not been initialized.

4.4.5Non-Maskable Interrupt Push Button (SW3)

SW3 is connected to the Non-maskable Interrupt (NMI) pin of the DSP. When pressed, the DSP will vector to the NMI interrupt vector.

ADSP-21535 EZ-KIT Lite Evaluation System Manual 4-9