68300

Hi there,

In 332tut.pdf there is a description of how to interface to 8 bit devices 
on a '332. The trick being to have the data show up on the high data bus lines.

I am setting the chip select in CSPAR to be an 8-bit port (10) and CSBAR to 
come active on the upper byte (10).

Is this correct? I just get 0xFF coming back.

Thanks,
Andrei

-------
Andrei Chichak               #200 10835-120 Street
Senior Software Developer    Edmonton, Alberta
Pulmonox Medical Inc.        Canada
                              T5H 3P9
                              (W) (780) 451-3660
                              (F) (780) 452-0169

Andrei,

Your settings look right.

Double check your CSOR[n] "MODE" bit, your "STRB" bit, and your "DSACK"
field.  You could be having a problem with the CS pulse starting too late
or not lasting long enough.

Just a thought.

Jeff





Andrei Chichak <acpmiedm@...> on 10/25/2002 02:04:16 PM

Please respond to 68300@yahoogroups.com

To:    :
cc:

Subject:    [68300] Setup for 8 bit devices


Hi there,

In 332tut.pdf there is a description of how to interface to 8 bit devices
on a '332. The trick being to have the data show up on the high data bus
lines.

I am setting the chip select in CSPAR to be an 8-bit port (10) and CSBAR to
come active on the upper byte (10).

Is this correct? I just get 0xFF coming back.

Thanks,
Andrei

-------
Andrei Chichak               #200 10835-120 Street
Senior Software Developer    Edmonton, Alberta
Pulmonox Medical Inc.        Canada
                              T5H 3P9
                              (W) (780) 451-3660
                              (F) (780) 452-0169



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Got it,

After a very entertaining and productive phone call from Charlie, we 
tracked it to a output enable line that was connected to the wrong pin.

A little bit of solder work and wazoom, up she goes.

BTW the answer was:
A0-n to A0-n
D0-7 to D8-15
CSPAR - 8bit port
CSn - upper byte

Thanks all.

Andrei