Analog Devices ADSP-21364 Benutzerhandbuch

ADSP-21364 EZ-KIT Lite Evaluation System Manual

2-11 

The SPI interface switch (

SW8

) disables the SPI chip select lines connected 

to the SPI flash memory and the AD1835A audio codec. The switch also 
disables the 

ADC_LRCLK

 and 

ADC_BCLK

 signals on the AD1835A device. The 

switch allows a customer to re-use the same pins on the SPI interface and 
on the expansion interface. The 

SW8

 default is all positions 

ON

 unless any of 

the switch signals or the SPI interface signals are used on the expansion 
connector or via an EZ-Extender

®

.

The push button enable switch (

SW9

) disconnects the push buttons from 

the corresponding processor pins. This allows the signals to be used else-
where on the board. 

 shows the 

SW9

 connections. By default, all 

of the switch positions are 

ON

.

Position 6 of 

SW9

 connects or disconnects the latch-enable pin of the LED 

to the logical 

OR

 of the 

~WE

 and 

~LED_CS

 signals. When position 6 is 

OFF

, 

the latch-enable pin of the LED latch (

U24

) is pulled high, making the 

latch transparent. In this position, the value of the LEDs is directly con-
nected to 

AD7–0

. 

Table 2-3. Push Button Enable Switch (SW9) Connections

1

SW1

FLAG1

2

SW2

FLAG2

3

SW3

DAI_P19

4

SW4

DAI_P20