Re: Help on assignment 3!

Ed Casas (edc@ece.ubc.ca) Thu, 25 Feb 1999 08:34:09 -0800 

Date: Thu, 25 Feb 1999 08:34:09 -0800
From: Ed Casas <edc@ece.ubc.ca>
Subject: Re: Help on assignment 3!



On Wed, Feb 24, 1999 at 06:57:13PM -0800, Warren Lee wrote:
> I was wondering what the clock for the RAM is for?

The rising edge is used to clock the data into the
flip-flops/registers in the RAM array.  As we discussed in class,
this clock is a "strobe" rather than a clock.

> Is it to tell the Ram to output to the data out at the rising
> edge of each clock cycle?

No, the output is asynchronous.  Reading from a RAM is like
reading from a ROM -- the device behaves like a combinational
logic circuit whose output is a function only of the address
and enable inputs.

> It needs to output to a bi-directional bus and can't output to
> a temp signal.

The memory does not have a bidirectional data bus.

-- 
Ed Casas   edc@ece.ubc.ca   http://casas.ece.ubc.ca   +1 604 822-2592