ECE 371 Lab Q/A

Date: Mon, 11 Sep2000 10:43:06-0400
Q:  I am not sure what is suppose to be written and read to the address that is inputted by the user.  Also what are IOR and IOW.

A:  Just write a program that loops (until the KB is hit) that write and reads from the address supplied by the user.  It dosent matter what you write there nor what you do with the data you get.  The point is to have the address strobbed onto the address bus, so that the PAL can decode it (point of the LAB).
/IOR  = Input/Ouput READ
/IOW = Input/Ouput WRITE
These correspond to the /MEMR and /MEMW on the BB, function in the same way, except that they have to do with IO memory rather than physical memory.
- Will

Date: Mon, 11 Sep 2000 22:02:29 -0400
Q:  I'm sorry for such a late question but what exactly is the data that should be
written to the outport?  Should it be prompted from the user?  And another
question is from the prelab.  It states that the second thing to do in our
lab manual for prelab is to determine a mapping between the pins and the
signals we are going to use.  Does this mean just to pick the pins we will
use and draw the signals going to them on the chip?

A: Question 1:  Above answer to question.
      Question 2:  Look at the data sheet for the PALCE22V10 that I provide on the web page. Then figure out which pins can be used for Inputs and which pins can be used for Outputs.