ATDH40M Просмотр технического описания (PDF) - Atmel Corporation

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ATDH40M

Programmable System Level Integration Prototyping System

Atmel Corporation 

Figure 2. Daughter Board Layout Example – ATDH40D84

Power Configuration

Power for the motherboard can come from two sources. It

can be supplied by either the jack inputs J1 and J2, or by a

9V power input P1. The source that will drive the mother-

board is determined by switch SW3. Power supplied by the

jacks uses the external setting. Power supplied by the

9V source uses the internal setting. Voltage on the

motherboard for the latter setting is regulated by switch

SW2. LV parts use the 3.3V setting while the rest use the

5.0V setting. The LED L1 will light up only when power is

correctly supplied to VCC. Table 3 lists the possible

configurations. AT40KAL and AT94KAL devices must use

3.5V power setting.

Table 3. Motherboard Power Distribution

SW1

SW2

SW3

Voltage

Off

X

X

0.0V (no power)

On

X

External Variable

On

3.3V

Internal

3.3V for

AT40KAL/AT94KAL

On

5.0V

Internal 5.0V for AT40K

Program/Boot Settings

Switches SW4 and SW5 determine the program and boot

settings for the ATDH40M. They are located on the bottom

left corner. Table 4 lists the switch combinations and their

effects. SW4 controls the SEREN signal line of the mother-

board to the 2:1 multiplexer (device U3) and the AT17

(device U1). SW% connects signal D0 from the PSLI

device to either the AT17 configuration memory device only

(down) or to the PC interface (up).

Table 4. Programming Modes

SW4 SW5 Effect

Up

Up Program in Slave Serial from PC

Down Up Program AT17 Configuration Memory

Up Down Program in Master Serial from AT17

4

ATDH40M/D

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