FPGA Central

Hello all,

Is there any mechanism to read the data on the data pins of ADSP-2181
EZ
kit lite (D0-D23)(or atleast 16 bits) like how we can read using
programmable flags ?(Which can be
made either input or output ports).

In Programmable flags we can do like this

AX0=0xff; //configure programmable flags for o/p
dm(Prog_Flag_Comp_Sel_Ctrl)=AX0;

AY1=0x61; //o/p 61 will appear on PF lines
dm(Prog_Flag_Data)= AY1;

With PF registers only 8 bit data is possible to o/p to outside
world!!!

Is there any method so tht i put my 16 bit data and directly read it
from EZ kit expansion connectors ?

In the same way is it possible to read from D0-D23 lines ?
Wheather Data tht has been put is persistant ?

If not so wheather we have to make what all conditions we need to
maintain
?
RD(bar) or WR(BAR) et.c

IS so how to do tht ?

So tht the o/p is made available to outside world.



Bye
Girish

Girish wrote:

> Hello all,
>
> Is there any mechanism to read the data on the data pins of ADSP-2181
> EZ
> kit lite (D0-D23)(or atleast 16 bits) like how we can read using
> programmable flags ?(Which can be
> made either input or output ports).
>
> In Programmable flags we can do like this
>
> AX0=0xff; //configure programmable flags for o/p
> dm(Prog_Flag_Comp_Sel_Ctrl)=AX0;
>
> AY1=0x61; //o/p 61 will appear on PF lines
> dm(Prog_Flag_Data)= AY1;
>
> With PF registers only 8 bit data is possible to o/p to outside
> world!!!
>
> Is there any method so tht i put my 16 bit data and directly read it
> from EZ kit expansion connectors ?
>
> In the same way is it possible to read from D0-D23 lines ?
> Wheather Data tht has been put is persistant ?
>
> If not so wheather we have to make what all conditions we need to
> maintain
> ?
> RD(bar) or WR(BAR) et.c
>
> IS so how to do tht ?
>
> So tht the o/p is made available to outside world.
>
>
>
> Bye
> Girish

The data bus on the ADSP-2181 is designed to directly interface to
memory and other memory-mapped peripherals, and acts like any other
microprocessor bus: the chip strobes data in on the trailing edge of the
~WR line, and it strobes data onto the bus on the leading edge of the
~RD line.

You need external hardware to build an I/O port onto this bus. You
should find a text or a web page on basic microprocessor circuits --
that will have a description of how to interface to your pins.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com