ADLINK Technology 72XX Series Manual do Utilizador descarregar pdf (Página 42)

28 Operation Theory

72XX Series

User’s Manual

4.1.6 Power On Configuration

The default configuration after power on, hardware reset, or soft-

ware reset sets all ports as input ports. Therefore, users do not

need to worry about damaging external devices when system is

on. In addition, the default signal level can be pulled high or pulled

low by setting the jumpers. Refer to section 2.7 for setting the

power on status of the DIO ports.

4.1.7 Note for Output Data

Be careful of the initial condition of digital output signals. If users

set the control word as output port after power on, the previous

uncertain output value will be put on the output pins immediately.

Therefore, BE SURE TO WRITE A SAFE VALUE TO THE

PORTS BEFORE CONFIGURING THEM AS OUTPUT PORTS.

4.1.8 Note for cPCI-7249R

The P1AE, P1BE, P1CE, P2AE, P2BE, and P2CE registers latch

data from P1A, P1B, P1C, P2A, P2B, and P2C respectively. The

latch signal is from Pin 99 of the 100-pin connector.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 73 74

Sem comentários

ADLINK Technology 72XX Series Manual do Utilizador Página 42