MPC821 datasheet(155/242 Pages) NXP

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MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

APPENDIX B - ADI I/F

The ADI parallel port supplies parallel link from the MPC8XXFADS to various host computers. This

port is connected via a 37 line cable to a special board called ADI (Application Development Interface)

installed in the host computer. Four versions of the ADI board are available to support connection to

IBM-PC/XT/AT, MAC II, VMEbus computers and SUN-4 SPARC stations. It is possible to connect the

MPC281ADS board to these computers provided that the appropriate software drivers are installed

on them.

Each MPC281ADS can have 8 possible slave addresses set for its ADI port, enabling up to 8

MPC281ADS boards to be connected to the same ADI board.

The ADI port connector is a 37 pin, male, D type connector. The connection between the

MPC281ADS and the host computer is by a 37 line flat cable, supplied with the ADI board. FIGURE

A-1 below shows the pin configuration of the connector.

FIGURE A-1 ADI Port Connector

NOTE: Pin 26 on the ADI is connected to +12 v power supply, but it is not used in the MPC281ADS.

B•1

ADI Port Signal Description

The ADI port on the MPC281ADS was slightly modified to generate either hard reset or soft reset.

This feature was added to comply with the MPC’s reset mechanism.

In the list below, the directions ’I’, ’O’, and ’I/O’ are relative to the MPC8XXFADS board. (I.E. ’I’ means

input to the MPC8XXFADS)

NOTE:

Since the ADI was originated for the DSP56001ADS

some of its signals throughout the boards it was used

with, were designated with the prefix "ADS". This

convention is kept with this design also.

•

ADS_SEL(0:2) - ’I’

Gnd

N.C.

Gnd

(+ 12 v) N.C.

HST_ACK

ADS_SRESET

HOST_VCC

ADS_HRESET

ADS_SEL2

ADS_SEL1

ADS_SEL0

HOST_VCC

Gnd

HOST_ENABLE~

HOST_REQ

ADS_REQ

ADS_ACK

N.C.

Gnd

PD0

PD2

PD4

PD6

N.C.

PD1

PD3

PD5

PD7

D_C~

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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