RE: Address lines Pull UP

Thank you for your replay,
   
  I haven't configured the address lines for SGPIO. So default is ADD only. And one thing is voltage levels are 3 Volts only not 5 Volts. It means these are address lines. 
  And one more doubt is generally in any controller data will not appear on external bus if we are accessing internal address locations. But in MPC565 we are getting address and data on the corresponding lines even we are accessing internal address locations.
  I am summarising my doubts.
  1. Why some address lines are acting like pullup connected lines?
  2. Why the data and addrress are appearing on corresponding lines even when accessing interanl address location?
   
  Please clarify my doubts. I am waiting for u r suggestions
   
  Regards
  Harini M 
  

Dobbin Allan-r11834 <[email protected]> wrote:
  Do you have the signals configured for ADDR or SGPIOA?  There are no
pulls for ADDR after you exit reset.  For SGPIOA, there are configurable
pull-downs. PDMCR controls SGPIO pull-down, not ADDR.

- Allan

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of harini m
Sent: Monday, May 29, 2006 2:48 AM
To: [email protected]
Subject: RE: [MPC500] Address lines Pull UP


Thank you for replay,
  I read the PDMCR register from registers in CW compiler.
  That is showing the vale as 0xF0000000. Which means all the control
and address lines are connected to internal pull ups. Then all the
address lines must be behave like pull up but it is not happeming like
that. Only some address lines are behaving like pull up. I have already
tested my board there is no pull ups connected to Address lines. 
  Please suggest me what will be the problem.
   
  Regards
  Harini.M

r11834 <[email protected]> wrote:
  Codewarrior runs a configuration script before downloading and
executing code from RAM.  This config file is part of your project and
may be modified.  Once your code executes, it can overwrite registers
that the config script has written earlier. Use the debugger to check
the value of PDMSR before executing your code is another way to
determine of the config file is writing this register.

Ensure something on your board isn't pulling these signals high by
testing them after a reset before executing with codewarrior.

- Allan

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of harini m
Sent: Monday, May 22, 2006 9:14 AM
To: mpc500 group
Subject: [MPC500] Address lines Pull UP


Hi,
   
  I am working on MPC565 processor on Metrowerks Code worrior.
  I am facing problem with Address lines. Some of the address lines are
showing active high state after dumping the code into internal SRAM by
using Code warrior (I think this are acting like pull up connected pins)
. 
  I have already disabled pull ups for all Address lines in PDMSR
register.
   
  The address lines A24,A23, A22, A21, A16 are acting like Pull Up
connected pins.
   
  Please suggest me why the address lines are behaving like this. Is
there any default initialization sittings in Metro werkes CW.
   
   
  Regards
  Harini.M     



                  
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