ADSP-CM403F datasheet(39/74 Pages) AD

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ADSP-CM403F EZ-KIT Lite Evaluation System Manual

2-5

ADSP-CM403F EZ-KIT Lite Hardware Reference

Figure 2-3 shows the equivalent circuit to Figure 2-2 but utilizes mechan-

ical switches that are in the same package. Notice the default is shown by

black boxes located closer to the ON label of the switches. In order to dis-

connect these switches, physically move the switch to the OFF position.

Figure 2-4 shows a bus switch example, reference designator UC (Pericom

PI3LVD512ZHE), selecting between lettered functionality and numbered

functionality. The signals on the left side are multiplexed signals with

naming convention letter_number. The right side of the circuit shows the

signals separated into letter and number, with the number on the lower

group (eg. 0B1) and the letter on the upper group (eg. 0B2). The default

setting is controlled by the signal CONTROL_LETTER_NUMBER which is pulled

low. This selects the number signals on the right to be connected to the

multiplexed signals on the left by default. In this example, the Microchip

IO expander is not shown but controls the signal CONTROL_LETTER_NUMBER

and allows the user to change the selection through software.

Figure 2-5 shows the equivalent circuit to Figure 2-4 but utilizes mechan-

ical switches. Notice the default for reference designators SWC and SWD is

illustrated by black boxes located closer to the ON label of the switches to

enable the number signals by default. Also notice the default setting for

reference designators SWE and SWF is OFF. In order to connect the letters

instead of the numbers, the user physically changes all switches on SWC and

SWD

to the OFF position and all switches on SWE and SEF to the ON position.

Figure 2-3. Example of Mechanical Switch Equivalent to Figure 2-2

ADSP-CM403F Datasheet(PDF) 39 Page - Analog Devices