Philips Semiconductors

Product specification

FB2041

7-bit Futurebus+ transceiver

1995 May 25

5

FUNCTION TABLE

MODE

INPUTS

OUTPUTS

AIn

Bn*

OEB0

OEB1

OEB2

OEB3

OEA1

OEA2

OEA3

AOn

Bn*

L

—

H

L

L

L

L

L

L

Z

H**

AIn to Bn

H

—

H

L

L

L

L

L

L

Z

L

L

—

H

L

L

L

H

H

H

L

H**

H

—

H

L

L

L

H

H

H

H

L

L

—

H

L

X

X

L

L

L

Z

H**

AI0 to B0

H

—

H

L

X

X

L

L

L

Z

L

L

—

H

L

X

X

H

H

H

L

H**

H

—

H

L

X

X

H

H

H

H

L

L

—

H

X

L

X

L

L

L

Z

H**

AI1 – AI3 to B1 – B3

H

—

H

X

L

X

L

L

L

Z

L

L

—

H

X

L

X

H

H

H

L

H**

H

—

H

X

L

X

H

H

H

H

L

L

—

H

X

X

L

L

L

L

Z

H**

AI4 – AI6 to B4 – B6

H

—

H

X

X

L

L

L

L

Z

L

L

—

H

X

X

L

H

H

H

L

H**

H

—

H

X

X

L

H

H

H

H

L

Disable Bn outputs

X

X

L

X

X

X

X

X

X

X

H**

X

X

X

H

H

H

X

X

X

X

H**

Disable B0 outputs

X

X

H

H

X

X

X

X

X

X

H**

Disable B1 – B3 outputs

X

X

H

X

H

X

X

X

X

X

H**

Disable B4 – B6 outputs

X

X

H

X

X

H

X

X

X

X

H**

X

L

L

X

X

X

H

H

H

H

Input

Bn to AOn

X

H

L

X

X

X

H

H

H

L

Input

X

L

X

H

H

H

H

H

H

H

Input

X

H

X

H

H

H

H

H

H

L

Input

X

L

L

X

X

X

H

X

X

H

Input

B0 to AO0

X

H

L

X

X

X

H

X

X

L

Input

X

L

X

H

H

H

H

X

X

H

Input

X

H

X

H

H

H

H

X

X

L

Input

X

L

L

X

X

X

X

H

X

H

Input

B1 – B3 to AO1 – AO3

X

H

L

X

X

X

X

H

X

L

Input

X

L

X

H

H

H

X

H

X

H

Input

X

H

X

H

H

H

X

H

X

L

Input

X

L

L

X

X

X

X

X

H

H

Input

B4 – B6 to AO4 – AO6

X

H

L

X

X

X

X

X

H

L

Input

X

L

X

H

H

H

X

X

H

H

Input

X

H

X

H

H

H

X

X

H

L

Input

Disable AOn outputs

X

X

X

X

X

X

L

L

L

Z

X

Disable AO0 outputs

X

X

X

X

X

X

L

X

X

Z

X

Disable AO1 – AO3 outputs

X

X

X

X

X

X

X

L

X

Z

X

Disable AO4 – AO6 outputs

X

X

X

X

X

X

X

X

L

Z

X

NOTES:

H

=

High voltage level

L

=

Low voltage level

X

=

Don’t care

Z

=

High-impedance (OFF) state

—

=

Input not externally driven

H** =

Goes to level of pull-up voltage

B*

=

Precaution should be taken to ensure B inputs do not float.

If they do, they are equal to Low state.

Z

=

High-impedance (OFF) state

—

=

Input not externally driven

H** =

Goes to level of pull-up voltage

B*

=

Precaution should be taken to ensure B inputs do not float.

If they do, they are equal to Low state.